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      09-28-2018, 12:24 AM   #23
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If coils replaced and still shaking suspect something else like a guibo going bad. Donít be surprise that bad engine mounts can cause shakiness as well. Good luck buddy.
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      09-28-2018, 08:10 PM   #24
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Originally Posted by W37V View Post
Just do all coils and plugs (if you haven't already). At least you will start from a clean slate on that end. Also, run some injector cleaner (something like chevron techron). Sometimes bad injectors can cause hesitation.

Sometimes a coil might go bad, but not be in such a bad shape to throw a code. However, it can cause slight misfire. You will mostly feel this under heavy load at low RPM. Coils are not traditionally considered a maintenance item, but in your case, what do you have to lose?

Also, if you change out plugs, make sure they are gaped properly. If you get wrong plugs, or if they don't have right gap, they can cause poor performance and misfire.

GL

Good call. I think it's the rest of the coils. Might as well swap them all with new ones. Plugs are all new (3-4 months old). I checked dealership servicing papers and saw that coil 3 was replaced but the indy mechanic found coil 3 to be faulty?
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Last edited by kanvas; 09-28-2018 at 08:24 PM.
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      09-30-2018, 08:50 AM   #25
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Had this happen to me last week. My car was like a damn shake bottle. Took it to the dealership to have plugs and coils replaced it runs smooth again.
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      09-30-2018, 10:31 AM   #26
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Good call. I think it's the rest of the coils. Might as well swap them all with new ones. Plugs are all new (3-4 months old). I checked dealership servicing papers and saw that coil 3 was replaced but the indy mechanic found coil 3 to be faulty?
Sometimes coil might not be seated properly (can back out) or wires disconnect or make bad connection. It happens. So, having same coil have issue is not that uncommon.

However, if you are having issues with the same cylinder after doing a new coil and plugs, then start looking into other reasons why you might have a misfire. It could be bad injector. If you replace injector and problem is still present, then you would need to do a leak down test to see if your compression is right. If your compression is off, then you might be looking into a bigger issue - bad engine.
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      10-08-2018, 02:46 PM   #27
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Just to make sure, there are 8 coils in a V8, right? Just checked a quote from the last mechanic for replacing all 8 coils, but QUANTITY says 6.
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      10-08-2018, 03:11 PM   #28
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Yes. One coil over each sparkplug.
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      10-08-2018, 04:41 PM   #29
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I had the same issue a few times on my 2016 f36 n20. Only happened like 3-4 times within 2 years. Went away every time I restarted the car. Happened once to my new 2018 x6. Both cars had piggibacks installed. Could be related?)
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      10-09-2018, 12:35 PM   #30
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Thanks everyone for your input! Finally found a trustworthy mechanic and got everything resolved (the previous mechanic was just... confusing). One of the coils was faulty; mechanic replaced and test drove and runs smoothly, but asked to replace the rest since it's just a matter of time before the other ones start going bad!
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      10-09-2018, 03:03 PM   #31
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Thanks everyone for your input! Finally found a trustworthy mechanic and got everything resolved (the previous mechanic was just... confusing). One of the coils was faulty; mechanic replaced and test drove and runs smoothly, but asked to replace the rest since it's just a matter of time before the other ones start going bad!
Glad you got it sorted out. Thanks for posting follow up.
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