Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: OmegaGav on 24 April 2010, 09:20:22
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Hi All,
Recently when starting the car it starts roughly and then splutters and conks out :-/ then on the second attempt it starts perfectly :-?
Also yesterday when driving back from my mates it was running as though it was missing at least 1 cylinder :-[ and also noticed an eggy type smell coming somewhere from the car :o
Went out this morning and the car started fine and i drove up the road and back and all seems good :-/
I have done the paper clip test and got code 135 and the usual 12 & 31.
Does anyone have any idea what might be going on ?
All help much appreciated :)
Thanks Gav :y
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135 Telltale (Checklight) Voltage Low
Can't see that causing any running issues, pop the leads out, any water/oil in the plug wells? You loosing any coolant?
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I would suggest that checking HT side is a good starting point :y
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The 'egg' smell is unburnt fuel in your CAT, you could do with driving the car least as possible in my opinion until you have sorted your missing as CAT's are rather expensive.
If you think its firing on 5 go with the cheapest first a set of spark plugs then go from there.
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oil in plug wells?
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Well had a poke about under the bonnet checked 2 of the ht leads no oil ( changed rocker gaskets last year and new bosch plugs)
checked water and this was a little low topped up with about 3/4 of a pint.
went for a spin was running fine when cold but once upto temp the missfire started again :(
Am thinking this could be a water issue, if so what would this be ? :-/
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temp sensor conection?
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plus need to diagnose water leek, check hbv obviosly, then in the v.
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No signs of outside water loss. checked all connections but to be sure where is the temp sensor connection ?
car runing lumpy on tick over but if i hold her on 2000 revs seems to be running fine it's just when i initally rev up it splutters a bit, and when driving ie under load :-[
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on the coolent bridge, in the v.
over what period did it loose the water?
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block your egr
check your injector sockets and clean them
if its a sensor problem (likely)
its hard to test it as it will give voltage readings even when hot anyway.. :-/
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Not sure how long it lost water last time i topped up was last year sometime.....
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Just been fiddling with the air sensors..... when i unplug the small top one the tickover improves slightly also tried unplugging the larger one underneath this also makes a difference but misfire still there when driving :(
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Thanks for your help so far guys but still haven't solved this, disconnected the EGR but this did not make any difference to anything !
If it is a sensor problem how many sensors are there? :-/ :-/
And are the injector sockets the 2 big fuel pipes on the drivers side ?
This is definitely an issue when the engine is hot :-/
Also will hold revs cleanly when stationary but will misfire when accelerating during driving :-/
Thanks Gav
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Thanks for your help so far guys but still haven't solved this, disconnected the EGR but this did not make any difference to anything !
If it is a sensor problem how many sensors are there? :-/ :-/
And are the injector sockets the 2 big fuel pipes on the drivers side ?
This is definitely an issue when the engine is hot :-/
Also will hold revs cleanly when stationary but will misfire when accelerating during driving :-/
Thanks Gav
do not disconnect egr, just block it with a metal layer (cut from a coke can or similiar)..
injector sockets are behind the plenum if I remember correctly.. dust and dirt fill in them and effect.. you can clean them with brake pad cleaner or similiar..
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Thanks cem, am i right in thinking the egr is the round black thing near the throttle cable with the brass flexy pipe going to the bottom of the engine ??
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I might be inclined to disconnect the MAF and see if your rough starting dissapears. Won't cost you anything and if it makes no difference then you know one thing it's not IMHO
VC ;)
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Thanks cem, am i right in thinking the egr is the round black thing near the throttle cable with the brass flexy pipe going to the bottom of the engine ??
the one with the red arrow ;D sorry photobucket erased most of my pictures so cant find another quickly..
(http://i181.photobucket.com/albums/x80/mecdv6/egr-1.jpg)
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Well my daughter said " dad it's the pink one you fool :o ) so i need to go get some torx heads ( bought the sockets last year ) and give the egr a good clean !
Also gonna change the fuel filter aswell as when putting demand on the engine it is lacking something :-/
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Hi All,
well i took the egr off and blocked the hole with foil and bolted back on but this made no difference to the rough running :-[ so i am presuming it is not the egr unit at fault :'(
It 's still running fine when cold but rough when hot so thinking it must be a sensor somewhere :-/ :-/
wondering if anything would show up on a tech 2 diagnostics ?
If anyone might be passing with one i would rather pay someone from here than take it to the stealers for the old " must be the headgasket routine !!" 8-)
Any more suggestions gratefully recieved :) :)
Thanks Gav
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so we have moved on from an aparent random missfire? are we saying its consistently running fine when cold, and runs rough at a certain consistent point when warmed up?
if so, and i'm a little vague on this open/closed loop stuff, if the ecu is seeing a cold engine when its hot, then it wont run right and will splutter, hence check temp sensor as a start.
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although the the temp. gauge wouldn't work. :-[
well i did say i was vague. :-/
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Yes chris always fine running cold but rough when hot between 80 - 90 :-/
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I think it would be easy for you to have a tech 2 session with TheBoy .. as he is close to you..
pm him.. :y
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Hi All, Me Again :-[
Well the car is running rough all the time now but decided to check the temp sensor as suggested and replaced it when i realised how much i had to do to get to it :o :o put back together again and........... Still running rough.. :( :(
Then decided to do another paper-clip test(with engine running) and got all these codes:
71 Intake Air Temperature Voltage High
73 Mass Air Flow Sensor Voltage Low
74 Mass Air Flow Sensor Voltage High
129 Exhaust Gas Recirculation (EGR) Valve Feedback Voltage Low
33 Exhaust Gas Recirculation (EGR) Valve Voltage Low
21 Throttle Position Sensor (TPS) Voltage High
57 Idle Air Control Voltage Low
Now I really am worried :o :o
I'm starting to think the ECU may be on it's way out :'( :'(
Any suggestions gratefully received :y :y
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check all the connections again.. dont leave any socket empty ..all these devices cant be faulty at a time..
imho will be more simple to have a tech 2 session..
as these codes can be cleared and re-checked ..
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All checked and connected :y
distress flare sent to TB
This couldn't be as simple as a fuse or similar ???
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All checked and connected :y
distress flare sent to TB
This couldn't be as simple as a fuse or similar ???
apart from those codes, there can be several reasons
which may cause rough running.. first have this
session.. :y
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Hi All,
well i took the egr off and blocked the hole with foil and bolted back on but this made no difference to the rough running :-[ so i am presuming it is not the egr unit at fault :'(
It 's still running fine when cold but rough when hot so thinking it must be a sensor somewhere :-/ :-/
wondering if anything would show up on a tech 2 diagnostics ?
If anyone might be passing with one i would rather pay someone from here than take it to the stealers for the old " must be the headgasket routine !!" 8-)
Any more suggestions gratefully recieved :) :)
Thanks Gav
Gav, just to clarify, when you removed the EGR valve, you said you blocked off the flange with foil? and then bolted it back on again?? does this mean you put tinfoil or similar in the hole & then replaced the valve on top of it, or did you blank off the EGR Flange and just fix the EGR valve by one of its bolts with the electrical connector still fitted? :y
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Hi philrich,
I took the top part of the egr of (2 small bolts) laid folded silver foil over the 2 holes between the 2 bolt holes then re fitted the egr as it should be with the foil in between and reconnected the connector.......
Does this help ? :y :y
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Hi All, Me Again :-[
Well the car is running rough all the time now but decided to check the temp sensor as suggested and replaced it when i realised how much i had to do to get to it :o :o put back together again and........... Still running rough.. :( :(
Then decided to do another paper-clip test(with engine running) and got all these codes:
71 Intake Air Temperature Voltage High
73 Mass Air Flow Sensor Voltage Low
74 Mass Air Flow Sensor Voltage High
129 Exhaust Gas Recirculation (EGR) Valve Feedback Voltage Low
33 Exhaust Gas Recirculation (EGR) Valve Voltage Low
21 Throttle Position Sensor (TPS) Voltage High
57 Idle Air Control Voltage Low
Now I really am worried :o :o
I'm starting to think the ECU may be on it's way out :'( :'(
Any suggestions gratefully received :y :y
I think these will all be codes stored as a result of you disconnecting things and running the engine.
Tech2 can tell the difference between current codes and stored codes but if you are doing the paperclip test you just get the codes.
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Worst case scenario is that you have got the beginnings of a head gasket failure. Coolant seeps into one of the cylinders when the engine is stopped but the cooling system still hot and pressurised.
Far more likely is that you have a faulty plug, plug lead or DIS pack.
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Thanks Andy :y
That makes total sense now I have calmed down ;) ;)
those are all the things i disconnected/reconnected with engine running :-X
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Just to let everyone know my problems are solved :D :D :y :y
I found this little bugger had split and must have been shorting out onto the engine :-? :-?
(http://i698.photobucket.com/albums/vv341/omegagav/SAM_0031.jpg)
(http://i698.photobucket.com/albums/vv341/omegagav/SAM_0034.jpg)
(http://i698.photobucket.com/albums/vv341/omegagav/SAM_0036.jpg)
Thanks for everyone's help :y :y :y :y
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Just to let everyone know my problems are solved :D :D :y :y
I found this little bugger had split and must have been shorting out onto the engine :-? :-?
(http://i698.photobucket.com/albums/vv341/omegagav/SAM_0031.jpg)
(http://i698.photobucket.com/albums/vv341/omegagav/SAM_0034.jpg)
(http://i698.photobucket.com/albums/vv341/omegagav/SAM_0036.jpg)
Thanks for everyone's help :y :y :y :y
:-?
glad to hear you found that .. :y
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Just a note to say don't buy genuine leads from vauxhall they wanted £110 per side :o :o :o £220 for all six :o :o :o
To say i was shocked was an understatement :o even the guy on the phone said he realised why they don't sell many :-X
Where as my local Allparts sold me a complete set of 6 for £50 :y :y