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Author Topic: Major misfire on idle, 2.2 petrol manual  (Read 7010 times)

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Andy A

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #150 on: 16 June 2018, 13:53:24 »



That's how the gasket arrived it was already bent like that in its packaging.

Never seen one like that before. There are three electric weld marks that hold the three together and stick out. Looks like I will have to file them down flush carefully to make them fit flush as possible. If I wanted to fit a better one what make of gasket would you recommend one?

Thanks
 
Sorry for late reply , busy weekend .
quick search shows the PAYEN one is MLS
Elring is MLS,
 BGA unknown
If you think your going to have to file the one you have ,then it sounds damaged
an MLS gasket will seal , just saying you need to clean the mating surface of the head up(no corrosion,oil etc)
advise you don't use any gum gum or other sealant before the cat in exhaust system
tighten the studs like you would a head gasket job , round in circles ,quarter turn each nut to bite it down even
don't overtighten

The gasket does look rough. It was put into the same cardboard box as the manifold and the manifold has damaged the gasket in transit. Where they have electric welded the three parts of the gasket together it has left the metal rough and proud of the main gasket. Its those three weld points that I need to file down and also there are a few small creases around the outer edge of the gasket.

I might just get in touch with ATP and ask them to send another gasket.

TheBoy said above that the MLS are the better gaskets to fit these days.
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Andy A

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #151 on: 16 June 2018, 14:13:56 »

Just had a look at Terry's photos of his gasket and I've noticed a difference. His gasket has only one weld and mine has three. The centre weld doesn't need to be flat because its in line with a cavity on the manifold. My two extra welds will be on the two flat mating surfaces so shouldn't be there at all and will prevent the gasket from sealing properly.

I'm not going to mess with it, I am going to ask for a replacement.

Thanks for all your help.
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Re: Major misfire on idle, 2.2 petrol manual
« Reply #152 on: 16 June 2018, 16:46:32 »

Might be quicker to ask for a refund, be prepared to send pics...

There's a Payen one on ebay for 8.46 :y
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Andy A

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #153 on: 16 June 2018, 19:16:28 »

Might be quicker to ask for a refund, be prepared to send pics...

There's a Payen one on ebay for 8.46 :y

Good idea, I'll do that on Monday and send some close up photos. :y



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terry paget

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #154 on: 20 June 2018, 17:23:15 »

New exhaust manifold fitted. Emissions still wrong. Diagnostic live data show P0170 lean exhaust. Both lambda sensors have active heaters, but sensor 1 reads a steady 20mV lean, sensor 2 reads higher voltages occasionally, but still lean, O2 loop open. As I watched it the O2 loop suddenly went closed, but not for long.

I have no idea what is wrong. Please help!
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TheBoy

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #155 on: 20 June 2018, 17:46:05 »

Was it hot enough to go closed loop?
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terry paget

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #156 on: 20 June 2018, 17:57:12 »

Was it hot enough to go closed loop?
I presume so. It went into closed loop briefly, but then fell out again. Water temp was high, engien had been running at 300rpm for several minutes.
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TheBoy

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #157 on: 20 June 2018, 18:17:19 »

I seem to recall if the system isn't closed loop, you cant believe the lamda readings.
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terry paget

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #158 on: 20 June 2018, 18:46:30 »

I seem to recall if the system isn't closed loop, you cant believe the lamda readings.
Right. With O2 loop closed, the lambda sensor informantion is in feed back with the air flow sensor. Working normally the mixture should read rich-lean-rich-lean every second or so. This results in the lambda reading on the MOT emission kit giving a reading of 1.00.
My other cars soon go into closed loop; not this one. Something is wrong. My hunch is the 1st lambda sensor, with its low voltage message on the diagnostic. I understand a sensor output voltage flips from low to high as the mixture goes from lean to rich. I guess 10mV is even lower than it should be, suggesting a sick sensor. .
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TheBoy

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #159 on: 20 June 2018, 18:51:55 »

What is the coolant temp sensor reading (the one for ECU, not the instrument guage)
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dave the builder

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #160 on: 20 June 2018, 19:19:26 »

This results in the lambda reading on the MOT emission kit giving a reading of 1.00.

what did it fail on ? % CO ? what reading ?
lambda of 1.00 is within range (0.97 - 1.03)
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terry paget

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #161 on: 20 June 2018, 19:42:40 »

What is the coolant temp sensor reading (the one for ECU, not the instrument guage)
105 degrees at 3000rpm, falling to 96 degrees at idle.
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terry paget

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #162 on: 20 June 2018, 19:44:12 »

This results in the lambda reading on the MOT emission kit giving a reading of 1.00.

what did it fail on ? % CO ? what reading ?
lambda of 1.00 is within range (0.97 - 1.03)
Failed on lambda not being .97 and 1.03.
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Doctor Gollum

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #163 on: 20 June 2018, 19:49:20 »

Exact number ???
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dave the builder

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Re: Major misfire on idle, 2.2 petrol manual
« Reply #164 on: 20 June 2018, 19:51:41 »

This results in the lambda reading on the MOT emission kit giving a reading of 1.00.

what did it fail on ? % CO ? what reading ?
lambda of 1.00 is within range (0.97 - 1.03)
Failed on lambda not being .97 and 1.03.
upper and lower limits ,,so 1.00 is in the middle surely  ???
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