Half Engine Light after cleaning intake valves and OCC install

jwalker87 · 07-24-2012, 10:11 PM

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!

gtaccord · 07-24-2012, 10:41 PM

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.

M3 Eater · 07-25-2012, 01:37 PM

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.

Jeff@TopGearSolutions · 07-25-2012, 01:46 PM

Quote:

Originally Posted by M3 Eater

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.

jwalker87 · 07-26-2012, 12:45 PM

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).

jwalker87 · 07-26-2012, 01:17 PM

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.

07-24-2012, 10:11 PM	#1
jwalker87 Major 331 Rep 1,031 Posts Drives: '08 335i, '11 335xi, '01 Z3M Join Date: Jul 2010 Location: Pittsburgh, PA iTrader: (2)	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, 10:41 PM	#2
gtaccord Major 59 Rep 1,465 Posts Drives: 2009 BMW 335xi Join Date: Feb 2012 Location: Maryland iTrader: (7) Garage List 2009 BMW 335i xdrive [0.00]	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, 01:37 PM	#3
M3 Eater Major 36 Rep 1,054 Posts Drives: 335i Sedan Join Date: May 2010 Location: Unknown iTrader: (3) Garage List 2007 335i [0.00]	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. __________________ JB4 beta 15 ohms FSB,AEM inline filter/ CM 10, ETS fmic, ER custom made charge pipe,TSW Donnington 18's,Simitumo HTRZ3, Injen DCI, AR DPs, Forge DVs, AA SLD, Koni FSD, ZSP springs.
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07-26-2012, 12:45 PM	#5
jwalker87 Major 331 Rep 1,031 Posts Drives: '08 335i, '11 335xi, '01 Z3M Join Date: Jul 2010 Location: Pittsburgh, PA iTrader: (2)	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, 01:17 PM	#6
jwalker87 Major 331 Rep 1,031 Posts Drives: '08 335i, '11 335xi, '01 Z3M Join Date: Jul 2010 Location: Pittsburgh, PA iTrader: (2)	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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