March 25, 2010 05:53PM
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Registered: 15 years ago
Posts: 609 : SoCal |
Well, after 26 years, she hiccuped a little yesterday and today. When sitting at idle, I get a burble that causes the rpms to drop about 300 rpm and then it goes right back up. The car is a 1984 5 speed 325E. It is not all the time which tends to make me think it is not a vacuum leak as I would expect that to be constant. At this point do I take out the Idle Control Valve and hose it down with carbl cleaner?
And for general interest, I have read you are never supposed to touch the adjustment screw in the ICV, true? If so, how do they adjust the ICV/ thanks guys alan |
March 25, 2010 07:52PM
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Registered: 15 years ago
Posts: 1,538 |
True...don't touch the ICV screw. The engine management computer takes care of adjusting the idle so if you change the setting the screw is at, you will upset the system and throw out the balances built in to it. |
March 25, 2010 08:37PM
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Registered: 15 years ago
Posts: 636 |
What Peter said. The system assumes that all parts are in proper working condition, and the computer is able to adjust the system to make up for slight differences or slightly used parts. If the idle is erratic, the cure is to find the part that is upsetting the system, not adjust the screw. Sporadic idle problems are a pain to diagnose. Is there any correlation to the engine temperature? A problem that comes and goes makes me think an electronic part (like a sensor) and not a broken mechanical problem. You may try letting the car idle and going through the engine wiggling all the wires. This is how I found a problematic relay in my car. ----------------------------------------------------------------------------------- 1989 - E30 - M20 - Manual. Approximately 270,000 miles 2000 - E46 - M52TUB28 - Manual. Approximately 110,000 miles |
April 01, 2010 04:33PM
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April 04, 2010 09:01PM
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April 05, 2010 07:55AM
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Registered: 15 years ago
Posts: 609 : SoCal |