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Idle problem

Tiny
SAM121212
  • MEMBER
  • 1990 BMW 525I
  • 2.5L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 250,000 MILES
Hello,
I noticed when my car is in park position and I turn on the headlights the idle starts to play up and down and when I turn them off it quits. What is the problem here? Thanks
Friday, June 30th, 2017 AT 4:34 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like the alternator is getting weak or it has a diode that is leaking. Here is a guide that will help you get the problem fixed.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Please run this test and get back to us we are interested to see what it is.

Cheers, Ken
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Sunday, July 2nd, 2017 AT 7:42 PM

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