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BMW 3-Series (E90 E92) Forum
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2A2B and 29E0 - horrible idle and driveablity but much better once warmed
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| 08-07-2017, 08:15 AM | #1 |
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Second Lieutenant
 
30
Rep 229
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2A2B and 29E0 - horrible idle and driveablity but much better once warmed
Pulled the car out of the garage last night to give it a wash and the idle felt off. After the wash, I pulled it back in the garage with the same rough idle and it threw these codes after sitting long enough.
Decided to take it for a ride and clearing the codes didn't change much but once it finally warmed up, it drove much better. Started it back up this morning and same horrible idle and driveablity threw codes again. I took some logs but this was after it warmed up. With my minimal searching, sounds like maybe precat O2? Changing maps didn't seem to effect anything. Once car was running fine once warmed, I got on it and hit boost Target so I an guessing no vac leaks. Details: 07 n54 manual with 75k miles Walnut blast 5k miles ago Plugs about 20k miles ago Coils about 10k miles ago Injectors seem to be original Jb4 MHD BEF pump Big Tom IC Dci CL DP PE exhaust mod I sometimes run e85 @ 30% but right now I have pure 93 octane Last edited by DSrugis; 08-07-2017 at 08:31 AM.. |
| 08-07-2017, 10:02 PM | #2 |
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Second Lieutenant
30
Rep 229
Posts |
Here is a cold start log. You can see AFR1 is at 20 while AFR2 is normal but after a while AFR1 drops back to normal. I also pulled the plugs and you can see 1-5 in this order here...
I was really leaning towards injectors but was surprised to see all 3 plugs looking fouled. I assume it could still be one bad injector throwing off the mixture for all 3 cylinders or possibly multiple bad injectors...or is it an o2? |
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