Limp Mode, only code is 5e18. help please

Marc81 · 08-16-2020, 03:13 PM

Hi guys,
I've been having an issue with my 07 328. The car is basically fbo. I get a 5e18 code and limp mode during half throttle acceleration. At around 50% throttle , I watch the ess max out (open fully) which is being commanded, during this instance the timing pulls to about 0 to -5 and I get massive power loss. Limp mode and 5e18 happen randomly. This only happens 2100ish rpm and up .The ess and valvetronic motor have both been replaced and test good. I have smoke tested the intake and the exhaust and confirmed no leaks. If I disconnect the maf it runs perfect. Again I get NO other codes. Any input on where to look or if anyone has had a similar issue?
thanks

NFiftyWon · 08-19-2020, 10:29 AM

surge on idle?

E92William · 08-19-2020, 11:34 AM

So with the MAF off it runs good? Have you tried a replacement or used working one?

Marc81 · 08-19-2020, 03:39 PM

no surge at idle. I already replaced maf with a oem unit.

Marc81 · 08-20-2020, 04:02 PM

Another question, why would the dme request the valvetronic fully open at half throttle? Or is this normal?

08-16-2020, 03:13 PM	#1
Marc81 Enlisted Member 1 Rep 33 Posts Drives: 07 328i Join Date: Dec 2018 Location: Ct iTrader: (0)	Limp Mode, only code is 5e18. help please Hi guys, I've been having an issue with my 07 328. The car is basically fbo. I get a 5e18 code and limp mode during half throttle acceleration. At around 50% throttle , I watch the ess max out (open fully) which is being commanded, during this instance the timing pulls to about 0 to -5 and I get massive power loss. Limp mode and 5e18 happen randomly. This only happens 2100ish rpm and up .The ess and valvetronic motor have both been replaced and test good. I have smoke tested the intake and the exhaust and confirmed no leaks. If I disconnect the maf it runs perfect. Again I get NO other codes. Any input on where to look or if anyone has had a similar issue? thanks
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08-19-2020, 10:29 AM	#2
NFiftyWon Second Lieutenant 97 Rep 239 Posts Drives: E90 LCI 328 X-Drive Join Date: Jun 2017 Location: Colorado Springs iTrader: (0)	surge on idle?
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08-19-2020, 11:34 AM	#3
E92William Banned 1998 Rep 2,026 Posts Drives: 2008 E92 328xi Join Date: Nov 2019 Location: Miami iTrader: (0) Garage List 2008 BMW 328xi [0.00]	So with the MAF off it runs good? Have you tried a replacement or used working one?
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08-19-2020, 03:39 PM	#4
Marc81 Enlisted Member 1 Rep 33 Posts Drives: 07 328i Join Date: Dec 2018 Location: Ct iTrader: (0)	no surge at idle. I already replaced maf with a oem unit.
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08-20-2020, 04:02 PM	#5
Marc81 Enlisted Member 1 Rep 33 Posts Drives: 07 328i Join Date: Dec 2018 Location: Ct iTrader: (0)	Another question, why would the dme request the valvetronic fully open at half throttle? Or is this normal?
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