SES light, reduced boost and vibration...what is it?

GeeWhiz · 06-18-2017, 11:53 AM

Hey guys,

Little about the car: 08 335i, JB4 map 1, DCI and that's pretty much it at the moment.

Issue: in the past two weeks, this has happened 2-3 times. After a mild hard pull, the SES light comes on, boost pressure will no longer go over 8 psi (vs 13psi with JB4 map 1) and I get a vibration from the front end only when accelerating. Vibration goes away when I lift off the accelerator. The first time it happened, the light went off by itself about 3 miles does the road and everything went back to normal. It happened again today, but I was less than a mile from home so it was still on when I shut the car off. Restart the car and the light is off and everything seems normal again.

Any ideas what the issue is?

CanadianTSi · 06-18-2017, 12:17 PM

Misfire. Time for plugs/coils.

06-18-2017, 11:53 AM	#1
GeeWhiz New Member 1 Rep 9 Posts Drives: 2008 335i Join Date: Mar 2017 Location: Arlington, Texas iTrader: (0)	SES light, reduced boost and vibration...what is it? Hey guys, Little about the car: 08 335i, JB4 map 1, DCI and that's pretty much it at the moment. Issue: in the past two weeks, this has happened 2-3 times. After a mild hard pull, the SES light comes on, boost pressure will no longer go over 8 psi (vs 13psi with JB4 map 1) and I get a vibration from the front end only when accelerating. Vibration goes away when I lift off the accelerator. The first time it happened, the light went off by itself about 3 miles does the road and everything went back to normal. It happened again today, but I was less than a mile from home so it was still on when I shut the car off. Restart the car and the light is off and everything seems normal again. Any ideas what the issue is?
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06-18-2017, 12:17 PM	#2
CanadianTSi Captain 207 Rep 607 Posts Drives: 2014 535 xDrive Diesel Join Date: Feb 2007 Location: Alberta iTrader: (0)	Misfire. Time for plugs/coils.
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