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Old 04-02-2012, 01:07 AM   #1
DiscoQuinn
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Join Date: Apr 2012
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Idle surging, loping,

Hey Guys.

Just picked up an '87 325e. Seems when the car is warmed up the idle revs up and down slowly when stopped at lights.

Suggestions?
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Old 04-02-2012, 01:57 AM   #2
stinson
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i just picked up an e30 too, all the research i did i basically found that noone has a perfectly running m20, mine still burps once in a while, it was pretty bad before i bought it. mine has a new icv in it, and cleaned some plugs and sensors and whatnot
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Old 04-02-2012, 02:16 PM   #3
DiscoQuinn
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Mine only wanders up and down when warm. I removed the icv plug but it only exaggerated the problem. My coolant also surges in the reservoir parallel to the rpm surges. I'm worried it's a bad headgasket.
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Old 04-02-2012, 02:23 PM   #4
Bullet Ride
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The first thing you should look for is vacuum leaks.
Has your coolant level been dropping as you drive the car (i.e. is the level when the car is cold lower than it was yesterday when the car was cold)? Is there oil in the coolant or coolant in the oil?

Coolant surge in the reservoir could be caused by air in the system. Try bleeding the system to see if there's any trapped air.
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Old 04-02-2012, 05:44 PM   #5
DiscoQuinn
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What's the best way up bleed the coolant? I'm used to cars with a cap on the radiator. With the e30 reservoir and the shape of the upper rad hose it wouldn't seem productive to jack the nose in the air.
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Old 04-02-2012, 05:47 PM   #6
Bullet Ride
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There's a bleed screw on the t-stat housing.
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Old 04-11-2012, 11:00 AM   #7
food
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Hey Quinn, been a long time. My other username is krgoodwin if you don't recognize this one.

I had a similar issue with mine. Turned out my idle screw was cranked in so far it brought the TPS out of idle. Sounds like yours might be a coolant issue but the TPS is something else to check.
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