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  #1  
Old 03-06-2004, 06:04 PM
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Join Date: Mar 2003
Posts: 28
rough idle/ hiss problem

I have a '87 420sel which was running fine until last week. It now runs rough enough at idle to shake the car. The car runs fine at speed. There is a noticable (loud) hissing sound coming from (seemingly) under the air cleaner. I looked around the engine for any loose or cracked hoses, etc. but found none. Upon removal of the air cleaner, I believe the hiss is coming from, bear with me here, the "circular thing" that opens when the engine is revved and closes at idle.

Sorry to be so technical, but hopefully you understand what I'm getting at.

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  #2  
Old 03-07-2004, 09:01 AM
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Location: Indiana "the region"
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The hissing sound is normal. Try cleaning Idle Control Valve. You can pull the plug off the ICV, rpm should go up to 1500.
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  #3  
Old 03-07-2004, 07:23 PM
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This hissing is not normal... It is way too loud- noticable from several feet away. Where is the idle control valve? I will check it & see what happens.
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  #4  
Old 03-07-2004, 09:13 PM
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Join Date: Nov 2003
Location: Fairhaven MA
Posts: 299
Check all the hoses around the intake and valve covers,,, and then check them again, the places you cant see, feel for cracks or breaks. Over time some of these hoses get brittle.. Any type of leak in the vaccum of the engine will cause the engine to run terrible

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