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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 > Bmw cannot find reason for engine malfunction



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      07-15-2014, 08:28 AM   #1
6BATMAN6
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So as some of you have seen over the months i have been trying to source a reason for my car throwing 30fe everytime it gets warmed up (when oil temp hits 235 ish )and at WOT . I finally gave in and took it to dealership and they cannot figure it out at all .. Say theyve done every test they could and cant find a problem .Its so frustrating that they cannot recreate the problem and i know ill pick it up today drive for 10 minutes and it will go right into limp mode ..if anyone may have any ideas please speak up .. I have replaced every sensor u can think of relating to boost pressure .. I have replaced diverter valves i dont not get any wastegate rattle .. Maybe a little on a cold night start but goes right away.. There are no leaks ..
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      07-15-2014, 09:26 AM   #2
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Quote:
Originally Posted by 6BATMAN6 View Post
So as some of you have seen over the months i have been trying to source a reason for my car throwing 30fe everytime it gets warmed up (when oil temp hits 235 ish )and at WOT . I finally gave in and took it to dealership and they cannot figure it out at all .. Say theyve done every test they could and cant find a problem .Its so frustrating that they cannot recreate the problem and i know ill pick it up today drive for 10 minutes and it will go right into limp mode ..if anyone may have any ideas please speak up .. I have replaced every sensor u can think of relating to boost pressure .. I have replaced diverter valves i dont not get any wastegate rattle .. Maybe a little on a cold night start but goes right away.. There are no leaks ..
Do you have a log? I would check to see if your car is hitting targeted boost before throwing anymore parts at it...
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      07-15-2014, 09:13 PM   #3
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Its so sporadic.. Sometimes it hits target and holds but will still throw code sometimes it will die off like a clear boost like and other times it will die off and then spike but i think the spike is coming from the dv slamming closed.. I only put jb4 in for like 2 days because my mechanical boost gauge just was easier to follow .. But ya i never logged it
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