car switching off below 2000 rpm

yunus · 08-17-2010, 01:38 PM

hello
i have 2006 323i sport

my vehicle every so often switches off when the revs drop below 2000rpm
this happens after 5 mins of driving , when i need to stop i dpress the clutch and as soon as it drops below 2000rpms it switches off , if keep the revs above that it stays on!
if i leave it off for about and hour and restart , then everything is normal for a few days then its starts again

its been in to the dealer twice already , dont know what they did the first time but the second i asked and was told that the car thinks its overheating then switches itself off, they replaced a thermostat , i dont know where , but 1 month later the same thing is happening !

any thoughts on what it may be ?

yunus

e90pilot · 08-17-2010, 11:43 PM

Bad MAF sensor maybe? Or maybe another bad sensor. It sounds like an electronic problem. It also could be a bad vacuum line too. It's really hard to trace these kinds of things down on a modern car. However, thermostat would have been the last thing on my mind. If the car was or thought it was overheating it would give you a coolant temp warning light. I've never heard of a car shutting off automatically because it thinks it's overheating. I had my car overheat once and it kept running until I shut it off.

yunus · 08-19-2010, 03:18 PM

i have booked the car in with the dealer , the foreman says he is doing some research and will personally try and locate the fault, lets hope he is capable !
keep you guys informed as to what the problem is ....

yunus · 08-26-2010, 03:05 PM

hi guys,

got my car back from the dealer today , the changed out the vanos solenoid valve, not quite sure what that does , buut they say that was giving the problem...........we'll see if it does happen again.

any idea what the solenoid valve does ? and do you think it is the cause of my issue ?

ta
yunus

e90pilot · 08-26-2010, 04:06 PM

Vanos is your variable vavle timing. If a part of it was malfunctioning, then it might cause your engine to shut off. I think that solenoid tells the vanos control unit when your car is idling which might explain why your car works fine when your rev it up and down but goes through idle and shuts off.

08-17-2010, 01:38 PM	#1
yunus Private 2 Rep 71 Posts Drives: BMW 135i DCT 2011 Join Date: May 2008 Location: CAPE TOWN iTrader: (0)	car switching off below 2000 rpm hello i have 2006 323i sport my vehicle every so often switches off when the revs drop below 2000rpm this happens after 5 mins of driving , when i need to stop i dpress the clutch and as soon as it drops below 2000rpms it switches off , if keep the revs above that it stays on! if i leave it off for about and hour and restart , then everything is normal for a few days then its starts again its been in to the dealer twice already , dont know what they did the first time but the second i asked and was told that the car thinks its overheating then switches itself off, they replaced a thermostat , i dont know where , but 1 month later the same thing is happening ! any thoughts on what it may be ? yunus
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08-17-2010, 11:43 PM	#2
e90pilot Freight Dawg 104 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	Bad MAF sensor maybe? Or maybe another bad sensor. It sounds like an electronic problem. It also could be a bad vacuum line too. It's really hard to trace these kinds of things down on a modern car. However, thermostat would have been the last thing on my mind. If the car was or thought it was overheating it would give you a coolant temp warning light. I've never heard of a car shutting off automatically because it thinks it's overheating. I had my car overheat once and it kept running until I shut it off. __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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08-19-2010, 03:18 PM	#3
yunus Private 2 Rep 71 Posts Drives: BMW 135i DCT 2011 Join Date: May 2008 Location: CAPE TOWN iTrader: (0)	i have booked the car in with the dealer , the foreman says he is doing some research and will personally try and locate the fault, lets hope he is capable ! keep you guys informed as to what the problem is ....
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08-26-2010, 03:05 PM	#4
yunus Private 2 Rep 71 Posts Drives: BMW 135i DCT 2011 Join Date: May 2008 Location: CAPE TOWN iTrader: (0)	hi guys, got my car back from the dealer today , the changed out the vanos solenoid valve, not quite sure what that does , buut they say that was giving the problem...........we'll see if it does happen again. any idea what the solenoid valve does ? and do you think it is the cause of my issue ? ta yunus
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08-26-2010, 04:06 PM	#5
e90pilot Freight Dawg 104 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	Vanos is your variable vavle timing. If a part of it was malfunctioning, then it might cause your engine to shut off. I think that solenoid tells the vanos control unit when your car is idling which might explain why your car works fine when your rev it up and down but goes through idle and shuts off. __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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