Help, 2001 S-type 4.0 engine rough idle

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04-25-2008, 02:16 PM

lrayray1

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Help, 2001 S-type 4.0 engine rough idle

Just bought this car, and it runs great on the highway, but idles rough and at low speeds. Brought it to a shop, they decided that I needed a fuel injector replaced. Once they replaced that it is running smoother but still missing and not running correctly. Had it tested at autozone...plugs 6 and 8 were misfiring. so I had all the plugs changed. The car is still missing and when in park it wont go any higher than 3000 rpms while hitting the accelerator.

any suggestions>?

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04-25-2008, 02:30 PM

KAZsam

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RE: Help, 2001 S-type 4.0 engine rough idle

you probably did not need plugs you needed the coils replaced.

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04-25-2008, 02:50 PM

FactoryJaguarTech

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RE: Help, 2001 S-type 4.0 engine rough idle

I agree

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04-25-2008, 02:53 PM

lrayray1

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RE: Help, 2001 S-type 4.0 engine rough idle

so do you suggest replacing the 6 and 8 coil?

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04-25-2008, 02:57 PM

KAZsam

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RE: Help, 2001 S-type 4.0 engine rough idle

If you can stand the hit I would do them all at the same time and while you are at it have them replace your valve cover gaskets

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05-05-2008, 01:26 PM

lrayray1

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RE: Help, 2001 S-type 4.0 engine rough idle

Ok replaced 6-8 coils, still has a miss. Took the car to firestone for diagnostics.....paid them 100 bucks and this is teh codesPO307 PO308 AND PO358......THEY WANTED TO CHARGE 85 DOLLARS AN HOUR TOM DO MORE TEST. ANY THOUGHTS?

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05-06-2008, 04:58 AM

FactoryJaguarTech

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RE: Help, 2001 S-type 4.0 engine rough idle

Yes. Replace all the coils as advised. Early 3.0 coils were nasty. You replace one coil and the next day another is misfiring. I always recommend doingthem all. Also you want to make sure you got no vacuum leaks under the intake.

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