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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old Yesterday, 12:30 AM   #1
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Join Date: Sep 2007
Location: Canada
Posts: 1
My Ride: Looking for E46
Rough idle after valves cleaning


I wanted to get all that carbon buildup cleaned from the throttle body, so I removed the intake plenum, and sprayed seam foam on the throttle body valve. While I was there, I also cleaned the ICV valve.

After getting everything back together, the car is now running very rough. It is shaking like crazy and can't get the engine to rev. The check engine light is lit.

My scanner is giving me misfire on 1 and 6, and also the random misfire code. I had more codes for misfires on other cylinders at first, but they went away.

I have no idea of what I did wrong and really have no idea on how to fix this. Did the seafoam or gunk could have ruined the spark plugs? What else could be causing this?

Thanks for your help!

Car has 80k miles and is an 03' M3 E46.
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