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Old 10-01-2011, 03:10 AM   #1 (permalink)
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Default Idle issue 87 5000cs quattro wagon

The car will not idle properly. The motor will not idle at all it will just shut down unless I slowly bring the idle down in increments from 2000rpm's to about 1000rpm's. It will idle around 1100 rpm's if I turn the climate control blower on high, this I believe places an extra load on the alternator. If the blower is off it will idle around 800. The car also has a starting problem that I believe is due to a faulty Hall sensor, based on what i have read in previous forum posts. If anyone has a part number for the Hall sensor as well as a photo of what it looks like that would be appreciated. I drive the car 100+ miles a day and it is quite a balancing act keeping the idle up when I hit city traffic, I can't let it stall out due to the starting issue. If it stalls I usually have to wait about 15 minutes before it will fire up again. Any suggestions would be great.
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Old 02-02-2012, 09:21 PM   #2 (permalink)
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Default 5000 tq

If you are talking of hall sensor in distributor being bad it won't ever start with out it. You have a vacuum,boost leak some where. I drove one of these cars for 12 years so I have seen their problems. What you are describing I went through! Any place on the engine that you have hoses other than coolant hoses should be checked. These are the places I would look. When engine is running, hold your hand under main hose from throttle body to intercooler and rev the crap out of it. Did you feel air blow onto your hand? Is there oil all over the top of the turbo? If so the hose is bad. Look over on driver side of engine down near oil pan about half way back is the engine breather hose. If it's soft and mushy and has any holes in, especially toward block side it won't start hot. Any leaks at all even engine oil seals including valve cover are very important on the engine. If you have a smoke machine would be a big help or get a can of carb cleaner and spray around hoses when you are trying to keep it running close to idle speed . If the engine speeds up look there for leaks. Good luck.
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Old 07-28-2012, 11:02 PM   #3 (permalink)
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Default it is the bypass valve.....

It is the boost bypass valve located in the air cleaner housing. The valve hangs open, and there is a huge vacuum leak. The valve relieves the boost pressure when you let off the throttle, so the plate in the metering unit will return to the idle position, instead of being held open by the boost pressure. IIRC, it is accessed easiest through the fenderwell after removing the liner.

hope this helps

Jesse in Rockville
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