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Author Topic: Major misfire on idle, 2.2 petrol manual  (Read 1177 times)

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terry paget

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Major misfire on idle, 2.2 petrol manual
« on: 01 April 2018, 11:08:22 »

This is the car I am preparing for MOT. I reported last week about a poor idle; did a diagnostic check, both lambda sensors were steady on 'lean', so I have changed the first lambda sensor and the MAF meter. Nothing has changed. I now suspect massive induction system air leak. I have been here before on a 2.5 after I trapped an O-ring replacing the plenum. The question for me is where is it on a 2.2. I suppose the whole breather system is supect, and the whole induction tract from air cleaner onwards.
Any tips most gratefully received.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #1 on: 01 April 2018, 11:29:17 »

What is the maf reading?
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #2 on: 01 April 2018, 11:48:19 »

Any steam from the exhaust Terry?

My 2.2 was rough only at idle and it was due to a HG fail
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #3 on: 01 April 2018, 14:00:16 »

Check all the rubber hoses connected to the throttle body... probably a simple air leak ;)
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #4 on: 01 April 2018, 16:07:07 »

What is the maf reading?
At 2000rpm steady running on all four22Kg/h, 1.35v;
at a hesitant idle (firing on 2?) 16Kg/h 1.00v.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #5 on: 01 April 2018, 17:11:19 »

At idle, sounds high.

What is the LTFT doing?
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #6 on: 01 April 2018, 17:16:26 »

Check all the rubber hoses connected to the throttle body... probably a simple air leak ;)
Presumably the coil pack is dry and happy...  :y
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #7 on: 01 April 2018, 17:19:06 »

I checked all the induction hoses for cracks or leaks, but could find none. So I moved on to checking the compressions on all cylinders. There was some oil in 3 & 4 but I ignored that, and did not siphon it out before the tests. The results surprised me.
No. 1 13.5bar
No. 2 13.6 bar
No. 3 18 bar
No. 4 20bar.

Perhaps I should have siphoned the oil out from above the plugs first.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #8 on: 01 April 2018, 18:14:41 »

You think... ::)

Still, at least you now know why it's misfiring...

Sort the camcover, change the plugs, check the coil pack and report back :y
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #9 on: 01 April 2018, 18:22:43 »

check the small breather pipe from the cam cover blow down it. if blocked clean it out. i changed the pipe on mine went to mush and just blocked up. also changed the t bar on the vacuum line as the rubbers were leaking, misfire went after that.  changed all the rubber links on the vacuum lines, so they all new now. and the breather line for the air vent for the tank.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #10 on: 01 April 2018, 19:02:34 »

You think... ::)

Still, at least you now know why it's misfiring...

Sort the camcover, change the plugs, check the coil pack and report back :y
Thanks Doc. I was about to enquire - could the oil in plug wells 3 & 4 have caused the low speed misfiring? I was hoping you might think it worth while to replace the cam cover gaskets, coil pack and plugs and try again.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #11 on: 01 April 2018, 20:29:58 »

That is exactly what I would do :y
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #12 on: 02 April 2018, 13:40:57 »

Any steam from the exhaust Terry?

My 2.2 was rough only at idle and it was due to a HG fail
Thanks for the suggestion, James. I suspect you are right, having changed MAF sensor and first lambda sensor I was at a loss to sort my emissions. I looked in vain for a major inlet air leak, and found none. I was in the process of checking head gasket by compression when I stumbled across oil in plug wells. It's so easy correcting the oil in plug wells first that it's worth the effort.
 I suppose I should remove my good cat section (just fitted) before I fire the engine up with new plugs and cam cover gasket, to avoid all that oil poisoning it. Bother.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #13 on: 02 April 2018, 13:52:53 »

Once the cat is up to temp it'll burn off any oil etc.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #14 on: 02 April 2018, 15:05:55 »

Any steam from the exhaust Terry?

My 2.2 was rough only at idle and it was due to a HG fail
Thanks for the suggestion, James. I suspect you are right, having changed MAF sensor and first lambda sensor I was at a loss to sort my emissions. I looked in vain for a major inlet air leak, and found none. I was in the process of checking head gasket by compression when I stumbled across oil in plug wells. It's so easy correcting the oil in plug wells first that it's worth the effort.
 I suppose I should remove my good cat section (just fitted) before I fire the engine up with new plugs and cam cover gasket, to avoid all that oil poisoning it. Bother.

Terry, I had oil in the plug wells and it was down to blocked breather pipes from the cam cover. Cleaned throttle body and pipes and it cured the misfire and the oil leak. It must have been a build up of pressure causing the oil leak on my Desmond.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #15 on: 02 April 2018, 15:24:14 »

Being a 2.2 does not stop it being an Omega...  ::)

All the petrol Omegas share most of the same issues. The only significant differences are that the four cylinder cars don't suffer particularly with water collecting in the plug wells from the scuttle and the V6 cam sensor failure does not upset the auto box and crankshaft sensor failure does not prevent the four cylinder from starting...

Coolant leaks are almost always hbv or radiator, oil leaks are always breather related (top end) or sump gasket/crank seals (bottom end), handling issues are always highlighted by failed front wishbone vertical bushes... etc, etc

Head gasket is a red herring in this case... Were it a V6, it wouldn't even be mentioned, even though the 3.0 is at least as prone to it.

Clean the breathers, sort the camcover leak and service it, just like you would any V6 Omega and report back.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #16 on: 02 April 2018, 16:20:30 »

I changed the cat section 9 days ago. Easy job removing the old aftermarket one, but much trickier installing the much heavier Vx system. I would not have done the job had the engine been stalling at idle. When son Jonny brought the car home for MOT preparation it was running and idling perfectly. It was starting, running and idling fine nine days ago. The stalling and bad idling began late last week. I changed MAF sensor and front lambda sensor, hoping that would cure it - no luck. Something serious has gone wrong in the last five days
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #17 on: 02 April 2018, 16:45:04 »

aside from the missfire / fouled plugs etc.....which needs sorting
worth checking that you have not disturbed a tight seal on the zorst manifold to head (while working on the cat)
a blowing zorst manifold gasket will also suck un-metered air via the egr port
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #18 on: 02 April 2018, 19:00:08 »

aside from the missfire / fouled plugs etc.....which needs sorting
worth checking that you have not disturbed a tight seal on the zorst manifold to head (while working on the cat)
a blowing zorst manifold gasket will also suck un-metered air via the egr port
What's the zorst manifold?  My Haynes index ends at X.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #19 on: 02 April 2018, 19:02:27 »

aside from the missfire / fouled plugs etc.....which needs sorting
worth checking that you have not disturbed a tight seal on the zorst manifold to head (while working on the cat)
a blowing zorst manifold gasket will also suck un-metered air via the egr port
What's the zorst manifold?  My Haynes index ends at X.
Slang for Exhaust.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #20 on: 02 April 2018, 21:42:09 »

Thank you. I don't think I mentioned it, but there is quite a crack in the exhaust manifold, which apart from making a noise, will allow entry of air, thus inbalancing the exhaust mixture. All bad news. I have seen this before in 4 cylinder Omegas, one more reason always to buy V6s.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #21 on: 03 April 2018, 12:16:24 »

 explains your lean condition  :D
same 2.2 engine in some .....
vauxhall & Opel Astra G; Astra H; Signum;  Vectra B; Vectra C; Zafira (A); Zafira B
careful you don't order the 2.2 diesel manifold if buying off the net or traveling to collect
assuming the manifold is the same for front and rear wheel drive  :-\
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #22 on: 03 April 2018, 16:03:52 »

Info wrong...

Not the same engine in later, ie 2005 on Vauxhalls... That is a very different chain driven beast...
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #23 on: 03 April 2018, 16:44:32 »

Info wrong...

Not the same engine in later, ie 2005 on Vauxhalls... That is a very different chain driven beast...

I stand corrected  :-[

i'm going to get bits off a 2.2 2002 facelift  sport tomorrow, i could inquire about the cost   ?
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #24 on: 03 April 2018, 17:30:40 »

Being a 2.2 does not stop it being an Omega...  ::)

All the petrol Omegas share most of the same issues. The only significant differences are that the four cylinder cars don't suffer particularly with water collecting in the plug wells from the scuttle and the V6 cam sensor failure does not upset the auto box and crankshaft sensor failure does not prevent the four cylinder from starting...

Coolant leaks are almost always hbv or radiator, oil leaks are always breather related (top end) or sump gasket/crank seals (bottom end), handling issues are always highlighted by failed front wishbone vertical bushes... etc, etc

Head gasket is a red herring in this case... Were it a V6, it wouldn't even be mentioned, even though the 3.0 is at least as prone to it.

Clean the breathers, sort the camcover leak and service it, just like you would any V6 Omega and report back.
Thanks for your wisdom, Doc. This car has made a fool of me. Son returned it running well, 3 weeks ago. I plugged in my diagmoser, and was surprised to discover that the post cat mixture did not vary lean-rich at idle, unlike my other 2.2, which did. I replaced the MAF sensor and 1st cat with new, and tried again. No change in mixture control, but now the car would not idle. I found oil in plug wells 3 & 4, plug pack not dry and happy. 
Clearly more work to be done. Will report back.                                                                                                                                                                                                                                                                                                                                                                                  jk enoui
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #25 on: 03 April 2018, 17:57:28 »

A lesson to correct diagnose before randomly changing parts, TP ;).  Get to understand and love your diags machine ;)
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #26 on: 03 April 2018, 18:57:38 »

In light of the manifold crack... Best add it to the list :y

Cheap and cheerful...

https://www.ebay.co.uk/itm/EXHAUST-MANIFOLD-OPEL-VAUXHALL-OMEGA-B-2-0-VECTRA-B-1-8-2-0-/371141255032

Hopefully someone can confirm that it will fit ;)
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #27 on: 03 April 2018, 21:39:09 »

In light of the manifold crack... Best add it to the list :y

Cheap and cheerful...

https://www.ebay.co.uk/itm/EXHAUST-MANIFOLD-OPEL-VAUXHALL-OMEGA-B-2-0-VECTRA-B-1-8-2-0-/371141255032

Hopefully someone can confirm that it will fit ;)
2.2 does not have secondary air injection as far as I know. I have found in the past that the exhaust gasket studs in the head are inclined to breaking off. On Ben's 2.2 the 2 front studs are missing - amazingly the gasket is not blowing at that point.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #28 on: 04 April 2018, 00:05:09 »

If you can get to the snapped studs and drill them out ,they are pretty soft
(using good quality sharp/new drill bits)
i started with a center punch, 1.5mm , 3mm, 5mm
(depth stop marking with tape on the bits,you don't want to go too deep)
then if you have an easy out extractor set?
the stud nuts are brass/copper and soft(sacrificial in comparison to the stud),
often swapped for steel nuts ,which get over torqued and snap studs
when fitting an exhaust manifold , treat it like you would a cylinder head
evenly tighten gradually by hand, (no air tools ,impact drivers)

i've seen studs screwed into the head past the fat section of the stud (splitting the head)
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #29 on: 04 April 2018, 07:34:41 »

In light of the manifold crack... Best add it to the list :y

Cheap and cheerful...

https://www.ebay.co.uk/itm/EXHAUST-MANIFOLD-OPEL-VAUXHALL-OMEGA-B-2-0-VECTRA-B-1-8-2-0-/371141255032

Hopefully someone can confirm that it will fit ;)
2.2 does not have secondary air injection as far as I know. I have found in the past that the exhaust gasket studs in the head are inclined to breaking off. On Ben's 2.2 the 2 front studs are missing - amazingly the gasket is not blowing at that point.

Here's what I got few years ago: https://www.vauxhall-car-parts.co.uk/acatalog/VAUXHALL_EXHAUST_MANIFOLD_-_24420438.html
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #30 on: 04 April 2018, 08:48:08 »

For the record Iím not suggesting head gasket failure is the cause. A methodical diagnosis is obviously needed

I was just saying that it did happen to my 2.2 :y
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #31 on: 06 April 2018, 17:09:25 »

Thanks James, I was puzzled by the sudden misfire at low revs, which seemed inconsistent with oil on coil pack.
Resigned as I was to swapping the cat section yet again, I have removed the coil pack and the the cam cover unit first. It occurred to me I might manage to siphon the oil out of cylinders 3 & 4 via the plug holes to avoid burning it off with engine running or risk poisoning my young catalyst.

Imagine my surprise; I turned engine to raise 3 & 4 to the top, expecting to see a sea of oil in pots 3 & 4 - not the case! They are as dry as 1 & 2! The oil must have drained past the rings into the sump.

So, no need to swap cat sections for the initial burn after changing cam Cover gaskets, then swap them back again. All I need do is fit new cam cover gaskets, clear the breathers, fit new plugs, and fire up, praying that it idles sweetly.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #32 on: 06 April 2018, 22:40:44 »

Not fixing the manifold is a mistake...

As is assuming that the oil gets past the plugs... Oil in the plug wells degrades the insulation properties of the coil pack rubbers to the point of affecting spark voltages... Hence the misfire.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #33 on: 06 April 2018, 22:59:46 »

Not fixing the manifold is a mistake...

As is assuming that the oil gets past the plugs... Oil in the plug wells degrades the insulation properties of the coil pack rubbers to the point of affecting spark voltages... Hence the misfire.
Thanks for the advice Doc. In my defence the manifold was cracked last year and passed MOT. In fact every 4 cylinder petrol Omega I have ever owned has sported a cracked exhaust manifold. I had one welded up, but it cracked again within the year. As commented earlier, the manifold retaining studs into the head are prone to breaking off in the head.
I shall examine the insulators for cracks before reassembly.  Other members have commented that oil is not a bad insulator!
I appreciate getting this car through its MOT will be a struggle. It only cost me £190 2 years ago.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #34 on: 08 April 2018, 18:21:16 »

You think... ::)

Still, at least you now know why it's misfiring...

Sort the camcover, change the plugs, check the coil pack and report back :y
Camcover sorted, plugs changed for new, coil pack cleaned up and all reinstalled. Engine ran, but misfired at idle and low revs. Diagnostic said misfire cylinders 1 & 3. Am investigating.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #35 on: 08 April 2018, 18:26:56 »

You think... ::)

Still, at least you now know why it's misfiring...

Sort the camcover, change the plugs, check the coil pack and report back :y
Camcover sorted, plugs changed for new, coil pack cleaned up and all reinstalled. Engine ran, but misfired at idle and low revs. Diagnostic said misfire cylinders 1 & 3. Am investigating.
Given that the fault has moved cylinders, I would suggest the coil pack is past its best...
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #36 on: 08 April 2018, 21:53:08 »

Or still that exhaust manifold crack messing up idle and low revs?
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #37 on: 10 April 2018, 09:57:09 »

You think... ::)

Still, at least you now know why it's misfiring...

Sort the camcover, change the plugs, check the coil pack and report back :y
Camcover sorted, plugs changed for new, coil pack cleaned up and all reinstalled. Engine ran, but misfired at idle and low revs. Diagnostic said misfire cylinders 1 & 3. Am investigating.
Given that the fault has moved cylinders, I would suggest the coil pack is past its best...
Thanks Doc, good advice. Have I a spare coil pack, I wonder? I rummage. To my surprise I find a coil pack marked '2.2'. With it I find a complete induction tract marked '2.2'. I decide to fit the induction tract first.
Fault disappears! Engine starts, idles, pulls normally.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #38 on: 10 April 2018, 11:29:07 »

Well done, Terry.
What's an induction tract?
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #39 on: 10 April 2018, 11:49:56 »

Well done, Terry.
What's an induction tract?


it's the hollow bit of the inlet manifold
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #40 on: 10 April 2018, 11:58:54 »

Well done, Terry.
What's an induction tract?
The assembly of hoses and mass air flow meter that connects the air cleaner to the throttle box. Fitting involves 2 hose clips and one electrical connector.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #41 on: 10 April 2018, 16:24:09 »

Well done, Terry.
What's an induction tract?
The assembly of hoses and mass air flow meter that connects the air cleaner to the throttle box. Fitting involves 2 hose clips and one electrical connector.

Terry do you have the part number or size of the two hose clamps that connect the air flow meter?

Mine are knackered.

Glad you got it all sorted. :y

Thanks

Andy
« Last Edit: 10 April 2018, 16:27:06 by Andy A »
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #42 on: 10 April 2018, 16:48:18 »

Well done, Terry.
What's an induction tract?
The assembly of hoses and mass air flow meter that connects the air cleaner to the throttle box. Fitting involves 2 hose clips and one electrical connector.

Terry do you have the part number or size of the two hose clamps that connect the air flow meter?

Mine are knackered.

Glad you got it all sorted. :y

Thanks

Andy
S3 size 40
29-76 USA
one is labelled,
the other says NORMA 72-80
make of that what you will
The diameter of the clamp point seems to about 76mm
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #43 on: 10 April 2018, 17:22:12 »

Well done, Terry.
What's an induction tract?
The assembly of hoses and mass air flow meter that connects the air cleaner to the throttle box. Fitting involves 2 hose clips and one electrical connector.

Terry do you have the part number or size of the two hose clamps that connect the air flow meter?

Mine are knackered.

Glad you got it all sorted. :y

Thanks

Andy
S3 size 40
29-76 USA
one is labelled,
the other says NORMA 72-80
make of that what you will
The diameter of the clamp point seems to about 76mm
Correction: those are the hose clips either side of the air flow meter, not the ones I touched. The air cleaner end clip is labelled 82-92 NORMA, the throttle body end clip is labelled Norma 66-75.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #44 on: 10 April 2018, 21:08:54 »

So, was it a split in the old inlet?
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #45 on: 10 April 2018, 22:49:09 »

So, was it a split in the old inlet?
Don't know. I looked for one and could not see one. The MAF sensor was a genuine Vx recent purchase from a  member presumed good, whereas the earlier MAFs were aftermarket and suspect. I suppose I should investigate further.  I was quite prepared to find the coil pack dodgy, or my cam cover gasket repair failing, or my new plugs (Densa) faulty or incorrectly gapped. I was warned the cracked exhaust manifold could cause faulty running. I never expected the induction tract change to cure the fault.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #46 on: 11 April 2018, 09:51:43 »

Well done, Terry.
What's an induction tract?
[/url]
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #47 on: 11 April 2018, 09:55:47 »

Well done, Terry.
What's an induction tract?
The assembly of hoses and mass air flow meter that connects the air cleaner to the throttle box. Fitting involves 2 hose clips and one electrical connector.

Terry do you have the part number or size of the two hose clamps that connect the air flow meter?

Mine are knackered.

Glad you got it all sorted. :y

Thanks

Andy
S3 size 40
29-76 USA
one is labelled,
the other says NORMA 72-80
make of that what you will
The diameter of the clamp point seems to about 76mm
Correction: those are the hose clips either side of the air flow meter, not the ones I touched. The air cleaner end clip is labelled 82-92 NORMA, the throttle body end clip is labelled Norma 66-75.

Thanks Terry for the info.  :y
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #48 on: 18 April 2018, 10:26:47 »

Oh dear. Having repaired the cills, and sorted the stalling, I hoped this car was ready for MOT. In a short test spin, however, the EML came on. I plugged in my diagnoser, up came P0170 lean exhaust. I checked live data, and found the O2 loop was open, even with a hot engine. Both lambda sensors recorded lean, and were not switching rich-lean as they should if the O2 loop was closed.

As this thread testifies, I have changed the first lambda sensor, and the MAF sensor. Members may tell me the cracked exhaust manifold will affect matters, but I have suffered cracked exhaust manifolds before on 4 cylinder Omegas, and they have not affected emissions or brought on EMLs. Atempting to change the manifold, if I can get one, will open a whole new can of worms, so I don't want to go there.

Please advise.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #49 on: 18 April 2018, 10:36:28 »

How big IS the crack in the manifold ?
you could try gum gum or JBweld ,
won't last as a fix but may last long enough to prove one way or another if the crack is an issue  ;)
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #50 on: 18 April 2018, 11:00:30 »


Good thinking.
I have a MIG welder. I was wondering if grinding a slot into the crack, and then trying to weld a repair into it, might achieve a similar temporary result. Silly idea?
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #51 on: 18 April 2018, 11:21:12 »

I'm not a welder so please don't shoot me if I'm wrong, but my understanding is that welding cast iron doesn't work: brazing does?

Ron.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #52 on: 18 April 2018, 11:33:36 »

Cast iron can be welded Ron.  :y
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #53 on: 18 April 2018, 11:45:05 »

OK, lead me to the firing squad, Albs!  :'(

Ron.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #54 on: 18 April 2018, 11:50:20 »

I've read that some have successfully welded those manifolds in-place.

Before welding drive/rev engine hot as possible so exhaust manifold is very hot, disconnect battery and then quickly weld with applicable welding method and then wrap the whole manifold with rock wool and let cool over night. This should prevent repaired manifold to crack/bend.
« Last Edit: 18 April 2018, 11:51:54 by mandula »
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #55 on: 18 April 2018, 14:31:48 »

I'm not a welder so please don't shoot me if I'm wrong, but my understanding is that welding cast iron doesn't work: brazing does?

Ron.


welding cast iron is possible, but it's a specialist job that's rarely durable on a long thin part like an exhaust manifold. Brazing tends to be a bit more successful, but the heat cycles of a manifold don't help.


Add the cost of doing it(you're not going to do it with a MIG welder for instance) and buying a new manifold is the only viable fix.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #56 on: 18 April 2018, 14:40:20 »

Yes Nick, that's roughly the way I remember hearing it (I think from Webby the bear - where is he these days?), that welding is at best temporary if it works at all and brazing is the only answer and even that will not last forever.
Would ceramic coating work?

Ron.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #57 on: 18 April 2018, 16:48:43 »

Thanks for all the advice, chaps. Could there be any other reason for the O2 loop remaining open? This car, and several other 4 cylinder Omegas I have owned, all had cracks in the exhaust manifolds, but passed MOT emissions tests. Repairing this car looks liable to exceed its value.
Now you see why I hate 4 cylinder Omegas.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #58 on: 18 April 2018, 19:31:12 »

If enough air is getting it, it will bugger up the readings, and also upset the fuelling.
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