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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Half Engine Light after cleaning intake valves and OCC install



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      07-24-2012, 09:11 PM   #1
jwalker87
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Half Engine Light after cleaning intake valves and OCC install

Title pretty much says it all... I cleaned my intake valves using THIS procedure, and also installed a Burger Tuning OCC while I was at it. Both went fairly uneventfully, until I got everything buttoned back up and started the car. This is on a 2008 e90 335i btw.

Everything sounds/looks fine, but I get a Half Engine Light, and SES light. I have not driven the car yet, but let it idle for ~10 minutes to warm up, thinking it might be cleaner gunk still in the intake tract. But it still comes back. The codes are Turbo A Signal High (or something like that) and Cylinder 4 misfire, but I'm pretty sure the misfire is from before I did the work (one of the reasons I'm cleaning the valves).

At my next opportunity (Thursday, since I will be at work from tomorrow morning until Thursday afternoon), I will take the cowl and engine cover back off and check for loose connections/hoses, but has anyone had similar problems after doing either of these maintenance items? Just looking for some good leads, so I might focus my efforts when looking for the problem.

Thanks guys!
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      07-24-2012, 09:41 PM   #2
gtaccord
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Did you plug back in all the sensors and make sure all the connections were tight? I also had a misfire after I cleaned my valves but eventually it went away.

Sounds to me like you have a boost leak or maybe a problem with one of the map sensors.
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      07-25-2012, 12:37 PM   #3
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2 sensors, tmap and boost. One on top of the manifold, one in the bottom of the charge pipe. The bottom charge pipe sensor gets forgotten every time I remove the manifold.
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      07-25-2012, 12:46 PM   #4
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Quote:
Originally Posted by M3 Eater View Post
2 sensors, tmap and boost. One on top of the manifold, one in the bottom of the charge pipe. The bottom charge pipe sensor gets forgotten every time I remove the manifold.
+1 Also make sure they didnt get any gunk on them.
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      07-26-2012, 11:45 AM   #5
jwalker87
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Thanks guys. I will check this afternoon, and be sure to look at the boost sensor (or whichever one is on the bottom of the charge pipe).
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      07-26-2012, 12:17 PM   #6
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M3 Eater, looks like we think the same! Didn't even have to take anything apart, could see the dangling connector as soon as I peered under the intake. Runs fine now, thanks.
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