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indye30 (guest)
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I have a 1986 325 es that has a surging idle issue that I haven't been unable to solve for months. The car always starts fine whether warm or cold and drives just fine. The idle is just fine when the car is cold; however, once the car gets up to temp after about 5-7 min. or a mile the idle will creep up to 1,000-1,1000 RPM. After another minute or so it will begin to surge from approx. 600-1,100 consistently. When I unplug the 02 sensor the issue generally stops or will happen MUCH less frequently and with a slower cadence but the car will idle at 1,100 RPM. When this occurs, if I pull the dip stick the idle will go down to normal but is a bit rough. I have: swapped the ICM, checked for vacuum leaks and replaced several hoses, checked the voltage on ICV it hums and seems to work fine, checked the idle control switch, swapped out and/or checked all components on intake including the idle switch, replaced the 02 sensor, checked the coolant temperature switch, checked the cold start valve for proper operation, replaced seals on dipstick and oil filler cap, cleaned the throttle plate, adjusted the throttle cable, attempted to set the idle speed on the ICV, and probably a few other things I cant recall. Please help, any suggestions are appreciated!

This post was auto-generated based upon a question asked on our tech article page here: BMW E30 3-Series Idle Speed Troubleshooting (1983-1991) | Pelican Parts DIY Maintenance Article
Old 10-29-2017, 03:53 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Join Date: Jul 2012
Posts: 3,189
if you restrict the idle control valve using hose clamp pliers, does the idle settle down? If so, check valve duty cycle, is it steady or changing?

- Nick
Old 10-29-2017, 03:53 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)

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