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E34 (1989 - 1995)

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  #1  
Old 07-07-2017, 12:09 PM
rav31 rav31 is offline
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Checked the distributor cap today

I think I found my 'mystery' low RPM (idle with a/c) miss today. I decided to check the distributor cap & rotor today, thinking I'd clean the contacts to see if this would eliminate this pesty rough running when stopped at lights. Look at the pics below to see if you can find the issue.
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  #2  
Old 07-07-2017, 04:19 PM
south26 south26 is offline
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Well it could be that the rotor is kind of dead and the cap is missing a certain little button, beyond that it looks good for another miles or two.


Andy
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  #3  
Old 07-07-2017, 08:37 PM
rav31 rav31 is offline
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Quote:
Originally Posted by south26 View Post
Well it could be that the rotor is kind of dead and the cap is missing a certain little button, beyond that it looks good for another miles or two.


Andy
Good eye Andy....I couldn't believe that the center spring loaded electrode of the Cap was missing most of it. It's about 1/8" or so GONE! So, it had to send/arc the spark over that gap to the Rotor brass contact surface. I guess that's why the Rotor center looks so dark. I'm hoping this eliminates the low RPM rough idle.
Anyone one else ever have this issue?
The take away on this is to check this part of the ignition/electrical even on 60k mile cars.
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Old 07-07-2017, 08:39 PM
south26 south26 is offline
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I had the same problem with a e28 528e, it ran a lot better after I replaced the cap and rotor.


Andy
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  #5  
Old 07-08-2017, 12:10 PM
EON535 EON535 is online now
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Mein Auto: 1990 535i E34
Had the same issue recently minus the missing piece on the cap. Had very rough idle then a "backfire of death" which led to a no start situation. Cleaned the cap and rotor for a temporary fix, car started and much smoother idle. 1990 535i

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Old 07-11-2017, 10:24 AM
MySatinDoll MySatinDoll is offline
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Quote:
Originally Posted by south26 View Post
Well it could be that the rotor is kind of dead and the cap is missing a certain little button, beyond that it looks good for another miles or two.


Andy
Lol. that will buff out and be good as new no problem.

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Old 07-11-2017, 12:05 PM
south26 south26 is offline
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Originally Posted by MySatinDoll View Post
Lol. that will buff out and be good as new no problem.

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True


Andy
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