E92 M3 Rough Idle
Discussion
I've been using Tesco Momentum 99 for the majority of my time with the E92, but recently switched to using Shell V Power.
Recently I've been noticing the car has a less than smooth idle when cold, it will hop between 800-1300ish RPM for a minute or so. I know this inst drastic, but it used to be silky smooth.
Having recently seen some mention of long term fuel trims, I'm wondering if switching fuels could be my issue. Is this likely or is my idle control value on the way out?
Recently I've been noticing the car has a less than smooth idle when cold, it will hop between 800-1300ish RPM for a minute or so. I know this inst drastic, but it used to be silky smooth.
Having recently seen some mention of long term fuel trims, I'm wondering if switching fuels could be my issue. Is this likely or is my idle control value on the way out?
I had the same thing on my e92 - according to the forums it seems some M3 are very sensitive to fuel, others not so much.
Run the tank through and try 2off tanks in succession of BP ultimate (that's the one I found to be the best after a lot of trial and error, followed by Sainsbury's super...). let us know how you get on.
Run the tank through and try 2off tanks in succession of BP ultimate (that's the one I found to be the best after a lot of trial and error, followed by Sainsbury's super...). let us know how you get on.
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