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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

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 09-24-2012, 05:30 PM   #1
Registered User
Join Date: Mar 2012
Location: Calgary, AB
Posts: 17
My Ride: 2003 BMW 330i
Whats wrong with my engine??

I switched my spark plugs a while ago and i put in the 1 prong iridium ones. I found out that they sold me the wrong ones so i bought the bosh 4 pronged ones.
A few weeks later i noticed that sometimes when my car is in idol it starts revving to 1500 rpm. A few weeks later the check engine light came on and ever since then every time i start up my car in the morning the engine starts shaking a little (misfire?).
I took it to the shop and it said system to lean and misfires in bank 1,2,3,4,5,6.
My mechanic suggested switching the o2 sensors and coils packs and seafoaming the engine and fuel lines. I did everything and nothing has changed. It has been 2 months and hasnt gotten worse but i need to fix.
Please help!!!
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