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[nilocp]

3.2 MV6 auto, giving it a bit of stick, then back off, feathered throttle around a bend, back on accelerator, and management light comes on with bad misfire!!

Stop, turn engine off and restart after a few minutes and it is running OK.

Any ideas??

[al brown]

Hi, would suggest getting the codes read first, I dont have the link to hand but it is easy to find on here for the pedal trick to flash them.
Post the results and those in the know will be quick to help.
Al

[TheBoy]

Aye, post the codes which the pedal trick reveals for free

[nilocp]

Going cross eyed trying to do this!!

I have 3 error codes.

They seem to be

9 3 9 9

9 4 3 9

9 3 9 2

Does that make any sense??

Colin

[horsecow]

Going cross eyed trying to do this!!

I have 3 error codes.

They seem to be

9 3 9 9

9 4 3 9

9 3 9 2

Does that make any sense??

Colin

would try again mate. just a guess but i think you've misread them and you're actually getting
10 3 10 10 which is actually 0 3 0 0
no idea what you got on the middle one
last one is probably 10 3 10 2 which again is 0 3 0 2
first one is a random misfire and last one is misfire cylinder 2. Check the second code again pls

[nilocp]

Crumbs this isnt easy for an old boy!!

10 3 10 10

10 3 10 2

10 4 3 10

Colin

[Entwood]

Ignore the 0430 .. it's a common one on the 3.2 .. a matter of "when" it happens not "if"

0300 - random misfires
0302 - misfire cylinder 2

The "tough" side unfortunately ... but coil pack/ spark plugs are the things to check. If the plug wells are full of oil add camcovers to the list of jobs

Coil pack, move the long thin seal from around the top and look for cracks and/or corrosion in the bakelite ... if any present it needs replacing. 

you might (or might not) wish to read this ...

http://www.omegaowners.com/forum/index.php?topic=113851.0

[nilocp]

Yes I know it is misfiring but why? It sounds like coil to me, but it has only happened twice and runs as smooth as a smooth thing. It only happens as I explained in a heavy overun situation. It sounds to me like it is overfuelling, the lamda is picking it up and shutting down a bank of injectors.

After the engine has been stopped it runs fine again for hundreds of miles.

What is the 0430 by the way?

I have read that thread before, and I did the cam cover gaskets on my old 2.5!!

There no signs of oil leaks any where. My old 2.5 had the plug holes filled with oil and that didnt misfire. I would be surprised if there is oil there. Low miles and very clean!

Thanks for the quick help

Colin

[TheBoy]

The codes point to that bank, now its up to you to visually check

0430, dont worry about that at the moment

[Entwood]

Yes I know it is misfiring but why? It sounds like coil to me, but it has only happened twice and runs as smooth as a smooth thing. It only happens as I explained in a heavy overun situation. It sounds to me like it is overfuelling, the lamda is picking it up and shutting down a bank of injectors.

After the engine has been stopped it runs fine again for hundreds of miles.

What is the 0430 by the way?

I have read that thread before, and I did the cam cover gaskets on my old 2.5!!

There no signs of oil leaks any where. My old 2.5 had the plug holes filled with oil and that didnt misfire. I would be surprised if there is oil there. Low miles and very clean!

Thanks for the quick help

Colin

Won't give a misfire as the ECU will "know" the injectors are closed and not fire the plug .. just like it does on "overrun" when you see 999 mpg in the window ..   Injectors are shut off ... 

You have a "misfire" .. so fuel is there but spark is either missing or incorrect phasing.

In the "old days"  plugs / HT leads / distributor cap / ignition coil ... now it's simply plugs / coilpack ..

[nilocp]

I describe it as a misfire, but it might be that fuel is shut off, so not firing at all?

Which bank do we think it is?

[Entwood]

0302 is the passenger side bank ...

see post #6