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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 > Engine malfunction power reduced



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      03-18-2013, 08:38 PM   #1
Twnturbofanatic
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Engine malfunction power reduced

Got the half engine light, power reduced today while driving using jb4 g5 iso on map 0. Stopped the car shut it off restarted it no code. Switched to map 1 ran a few pulls nothing. Switched to map 0 hit 3k rpm. Threw same code half cel. Shut off car restarted, Went into code reading and it only read 3F (30mph, 150mph). Then flashed four times. Anyone have any input what could be wrong
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      03-19-2013, 01:08 AM   #2
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Btw cleared the code, I guess I'll check it when the half light is on. Hopefully it doesn't come back doubt it though.
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      03-19-2013, 02:59 AM   #3
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If your on map 0 with the G5 ISO then its def underboost code. Map 0 is no longer a "real" pass thru map and Terry even explains it in the G5 ISO thread on N54tech. Its in the first couple sections of him explaining what the G5 ISO is and what hiccups there are, such as the one your having.. Map 4 is 7psi across the board if im not mistaken and has CAN active. Map 0 however will be fine for dealer visits for software updates, inspection, ect
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      03-19-2013, 10:17 AM   #4
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Oh alright that explain why it would activate around 3k Rpms then since that's when I should be building boost. No reason to worry I guess then?
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      03-20-2013, 07:04 PM   #5
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Question Engine Malfunction

Hey guys this is my first post and i dont mean to thread jack but check this out



Every time i get on the gas it throws this code i am thinking possible vacuum leak somewhere but im completely stock just a muffler delete and lowered but other than that nothing under the engine bay has been touched but topping up fluids. I cant seem to find a problem at all
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      03-31-2013, 02:38 AM   #6
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��Same problem here
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