525I 1991 dies sometimes at Idle - Page 2 - Bimmerfest - BMW Forums

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E34 (1989 - 1995)

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Old 02-06-2013, 01:50 PM
FlynFish FlynFish is offline
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Location: Winters, CA
Join Date: Aug 2009
Posts: 27
Mein Auto: BMW 525iT
Just following up to see if all is still well? I have a similar issue so this may be a helpful way to a happy ending...
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Old 02-06-2013, 05:34 PM
fryntyr fryntyr is offline
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Location: Washington State
Join Date: Nov 2012
Posts: 17
Mein Auto: 1991 BMW 525I
Yes, the CTS was the main problem. Ran excellent and picked up a several MPG. At least until someone hit and run it and totaled it out.

Bought it back from insurance to use the parts. Found a nice grey with black interior 91 525I non-runner for a great price to swap parts from the wrecked one and ended up only being the fuel pump.. HA!!!!!!
Runs and drives awesome. I did swap the bilstiens off the wrecked one and the newer wheels and tires. Very happy.

Now I have a great drive train and most the body and interior to use if I find another one.

Last edited by fryntyr; 02-06-2013 at 05:35 PM.
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Old 02-06-2013, 05:41 PM
samsonnyc samsonnyc is offline
Location: Socal
Join Date: Jan 2013
Posts: 33
Mein Auto: 525
Why did your car not run normally when you disconnected the cts during testing ? Since that was the problem ?

Was it because of all the other vacuum leaks ?
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Old 03-12-2013, 02:39 AM
motorcitycobra motorcitycobra is offline
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Location: Klagenfurt, AUSTRIA
Join Date: Mar 2013
Posts: 3
Mein Auto: M5 S38B36
CPS Crankshaft Position Sensor

I did not read all the posts above ... just stopping by and throwing in this information ...

Had this issue with engine sometimes stalls at idle myself - after several other tries I found out the pretty old CPS and/or itīs electric cable connetions have been the reason. The signalling is sensitive and a damaged cable shield may allow other eletrical things to interfere or disturb the signalling; or sometimes there are simply no signals arrive fromt he CPS. If so, the CPU does not know crankshaft = pistion position and no ignition impulse can be sent.

See the damage which leaded to poor signalling ...

Last edited by motorcitycobra; 03-12-2013 at 03:10 AM.
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