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Cold Idle + heavy brake pressure = weird 200 1993

1993 240 Sedan.

When the engine is cold, having sat overnight, and then being driven about 1 mile, the engine idle is inconsistent when brakes are applied, once the car stops.

(vrrrrm..(almost stall and engine shakes)..vrmmmm..(low idle)..vrrmmm..vrrmm).

It seems to be directly related to how hard I push on the brakes. If I throw it into park quickly at a stop, and release the brake, idle evens out quickly. Otherwise it will sometimes even itself out after 6-7 rev..hesitate...rev cycles.

As the car warms (time, not necessarily temp guage to the "dot") the idle with brakes evens out, there is still a very faint "vrrmm...vrrmm" but it seems normal.

Finally, when the car is warm, if you stand on the brake hard the car idle goes back to inconsistant as long as heavy pressure is applied. There is also a "hissing" noise directly behind the dash, which is the master cylinder I know. If you lighten the pressure, but do not release, the hissing stops and the idle "flattens".

So, experts and gurus, what do ya think? I don't know brake systems...yet. Or even if the two are related. All ideas welcome!

--

Pete






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New Cold Idle + heavy brake pressure = weird [200][1993]
posted by  BrickOCheese  on Tue Apr 30 06:39 CST 2002 >


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