Engine power loss above 4000 rpm. - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-30-2008, 08:18 AM
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Engine power loss above 4000 rpm.

HI all,
I have a '97 e36 328i. I had some issue with the car not starting about a week ago. I was able to open the butterfly up slightly and get it to where it would idle. I have not hada chance to dig into it further since doing that, and truly fix the problem. Then yesterday on my commute home from work i noticed that as I accelerated in any gear the engine would bog severely above 400 to 4500 rpm. I have searched all over the net trying to diagnose the problem, but can't find anyone with my issue. Could the two issues described above be related? I need to check my ICV, and MAF sensor, but I am not sure if these could create the condition I am getting. Any help would be much appreciated.

Thanks,
Dave
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#2 (permalink) Old 05-30-2008, 09:05 AM
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Originally Posted by design engnr View Post
HI all,
I have a '97 e36 328i. I had some issue with the car not starting about a week ago. I was able to open the butterfly up slightly and get it to where it would idle. I have not hada chance to dig into it further since doing that, and truly fix the problem. Then yesterday on my commute home from work i noticed that as I accelerated in any gear the engine would bog severely above 400 to 4500 rpm. I have searched all over the net trying to diagnose the problem, but can't find anyone with my issue. Could the two issues described above be related? I need to check my ICV, and MAF sensor, but I am not sure if these could create the condition I am getting. Any help would be much appreciated.

Thanks,
Dave
Hi! Dave! Is your check engine light on? Also I think a defective MAF can cause those conditions!
johnny,

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#3 (permalink) Old 05-30-2008, 09:38 AM
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maybe a weak fuel pump?

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#4 (permalink) Old 05-30-2008, 11:10 AM
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Thanks guys,
The car isn't throwing the Check engine light. Is there any good way to test the MAF and fuel pump?

Dave
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#5 (permalink) Old 06-01-2008, 11:19 AM
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Lightbulb

fuel pump is tested by a pressure test vis-a vis the volume of output per given time. MAF/AFM can be tested using an ohmeter and visual inspection - but may i suggest that you take your car to a shop that can do a scan on it. It's the logical way to fix probs fitted with OBD2. The data printout will tell u a world of things, and take out all the guesswork.

Offhand, if you are losing power above 4000rpm, what immediately comes to my mind is o2 sensor gone wacky; ignition timing malfunction(spark advance in particular)... or the rev limiter cut-off switch wrongly adjusted/gone bad.
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#6 (permalink) Old 06-02-2008, 05:29 PM
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Could be spark plugs??

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#7 (permalink) Old 06-05-2008, 12:16 AM
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i had something similar happen to me in e30. check for engine seal leaks. perhaps timing chain, ignition timing malfunction. does transmission respond out of sync in anyway during shifting? I had car serviced, problem never came back up. but was no explanation other than typical service new timing belt, and v belts. oil change.
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#8 (permalink) Old 06-07-2008, 11:24 PM
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Have you tried the pedal trick? You can check for error codes even if the check engine light is not on by doing the pedal trick. Chances are if there is a problem, it threw a code and will show up.

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