Rpm Surging At Idle

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Location
Vancouver
#1
Hey guys, im new to this forum and my 1986 325 is my first car aswell. I have had the car for about a month and had been mechanically running fine, but today i took a little drive and as i was heading home at a stop light idling, the rpm started surging from idling 900rpm down to 500rpm then back up and down etc. I got home and parked and got out of the car to ask my Grandpa about it but it then stopped surging. We think it may have something to do with the distributor cap or rotor but we're not completely sure yet. ANY HELP PLS.

THX
 

JimHow

New Member
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10
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0
Location
Greenville, NC
#2
I had the same problem with my '87 325i. Idle fluctuated between 500 and 1200 for the first couple minutes after starting it. I removed the inflow boot and doused the throttle and idle control vavle with throttle body cleaner. The car immediatly went to a smooth 750rpm idle. I would try this first...may save you some time and $.
 


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