'95 530i 5spd stall at 3000rpm - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 10-21-2008, 12:00 PM
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'95 530i 5spd stall at 3000rpm

I've had this problem since I bought this car, and it used to only stall at about 4500-5000rpm, so under normal driving conditions it was no problem. Now it stalls at 3000rpm, which is right in normal driving rpm range.

The symptom is that the engine will cut out for a split second, will sharply nosedive, and the check engine light will come on for that split second. Then it will continue running as if nothing happened. It will not get past that rpm range though. It has been at a BMW certified mechanic for almost three weeks now and I'm starting to get a bit worried.

Elsewhere I saw someone mention a break in the throttle switch's internal potentiometer? Is that a legit possibility?
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#2 (permalink) Old 10-21-2008, 12:10 PM
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Wow! this is a weird one, what have you had done to the car as in new parts etc. and has it had a diagnostics.

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#3 (permalink) Old 10-21-2008, 12:11 PM
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Not sure about potentiometer, but a friend of mine had a done up punto (not the same i know)
But that use to do the same, and that was the ecu.
I had another friend with a golf gti, that was the same.
When it start's pissing about, doe's it rev up when you start it again?
Doe's it start again?
Or doe's it rev up like a bag of shite?
Don't know if any of this info will help,
but hope you get it sorted soon mate.
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#4 (permalink) Old 10-21-2008, 12:23 PM
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Quote:
Originally Posted by marti5 View Post
Wow! this is a weird one, what have you had done to the car as in new parts etc. and has it had a diagnostics.
So far I have only replaced the brakes, shocks/struts, and radiator. It has had a diagnostics test and it found both cam and crankshaft position sensor failures. Both were replaced (it wouldnt even start before these were replaced).

Quote:
Originally Posted by kandi08
Not sure about potentiometer, but a friend of mine had a done up punto (not the same i know)
But that use to do the same, and that was the ecu.
I had another friend with a golf gti, that was the same.
When it start's pissing about, doe's it rev up when you start it again?
Doe's it start again?
Or doe's it rev up like a bag of shite?
Don't know if any of this info will help,
but hope you get it sorted soon mate.
The first mechanic I took it to (who had it for three months and the fix lasted two months) originally said it was the ecu then changed his mind and said it was a corroded relay to the fuel pump (replaced). If you guys think it's an ecu, I can pick up a used one with a warranty and test it.
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#5 (permalink) Old 10-21-2008, 12:42 PM
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Hmmmmm....... PCV valve ??

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#6 (permalink) Old 10-21-2008, 01:42 PM
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I'd go ecu mate.
Depends on how pricey.
But that's what i think it sound's like mate.
Must be worth having a look at PCV aswell anyway.
Hate to fix one thing then something from the same group of problem's come's along.
Pretty sure it's ecu.
Sorry if i'm wrong.
Good luck, let me know how it goes.
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#7 (permalink) Old 10-21-2008, 02:12 PM
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You havent said if youve had a diagnostics run !?

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#8 (permalink) Old 10-22-2008, 08:11 AM
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You havent said if youve had a diagnostics run !?
According to the diagnostics run on it (by the BMW certified mechanic) the only problems were the cam and crankshaft position sensors. He has since replaced both but is still having the problem.
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#9 (permalink) Old 10-22-2008, 11:58 AM
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I would go for the pcv valve next, as they always go due to age, so if its not that at least you know in 3 moths or so time, thats been done. however if that doesnt make a difference get back to us.

Ah! has the MAF been changed if it has is it a genuine BMW one. If you unplug the MAF and theres no difference,as in idle or running then its shot.

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#10 (permalink) Old 10-23-2008, 07:54 AM
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He already checked the MAF. Now he is saying that it looks like the instrument cluster was swapped from a V6 5-series and that is causing the computer to act up (since the rpm ranges would be different between a V8 and a V6).

Sound plausible?
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#11 (permalink) Old 10-23-2008, 11:52 AM
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Wouldnt have thought that would make much difference, all it would give is a false reading maybe??. I would still go for the PCV valve, also how old is the camshaft sensor, reason I ask a mate of mine went through 5 in a year, which were BMW so they have a12 month warranty.

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#12 (permalink) Old 10-24-2008, 01:36 PM
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He already checked the MAF. Now he is saying that it looks like the instrument cluster was swapped from a V6 5-series and that is causing the computer to act up (since the rpm ranges would be different between a V8 and a V6).

Sound plausible?
Perhaps; I've certainly heard of cars running bad with a bad/missing cluster ... might be the same if you switch between V8/non-v8 cars. I don't know.

That said, however, if your mechanic said "v6 bmw", you need to find a new mechanic, as there never was a bmw v6 engine ... it's a straight 6.

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#13 (permalink) Old 10-24-2008, 01:50 PM
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Correct! straight 6.

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