2K GT single cylinder misfire mystery

Jun 11, 2008 5 Replies

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Mark G7#9 18 years ago

I had an OBDII code check and it told me that cylinder#5 has been misfiring. Since I never changed the plugs (after 100K miles), I changed all 8, and the problem went away for a few weeks. Now, the same cylinder is misfiring again.

What I also noticed is that when the car is in the garage for more than a week, the misfiring always happens on first (cold) start. If I use the car the next day, all is OK.

Should I change the coil as well or the wiring harness (which seems like a huge pain to do)??? Thanks Mark

2000 GT 'vert

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Dan 18 years ago

Exchange the coil pack with another cylinder and reset the PCM. If the problem moves it's the coil pack. If it stays on hole number 5 there it's a different problem. You could then do that same swap with the injector to eliminate/verify an injector problem.

Dan

2003 Cobra Convertible With Some Stuff and Things

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Mark G7#9 18 years ago

Good advice (should of thought of it myself). Not sure how to swap the imjector though. Isn't it integrated into the fuel rail thingy?

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Dan 18 years ago

Well, not integrated into as much as attached to :). The inlet side of the injectors are clipped/mounted to the rail and the rail is bolted down to the manifold. The oulet side just press fits into the manifold hole with an O-ring for a seal.

Dan P49Y+

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Mark G7#9 18 years ago

I'm thinking that the coil may be eliminated as a problem since it would be bad all the time , not just on cold starts. The injector may be affected though since over time of long rests, maybe something goes funny with the mixture. Makes sense?

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ah 18 years ago

Good advice (should of thought of it myself). Not sure how to swap the imjector though. Isn't it integrated into the fuel rail thingy?

Un-freakin'-believable!

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