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rmc911
Join Date: May 2009
Posts: 3
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oil cap
1986 911 new top end, will not idle, up and down,runs good with oil cap off???
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05-25-2009, 10:13 AM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
Posts: 3,059
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sounds like you have a bad vacuum leak somewhere.
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.  Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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05-25-2009, 10:39 AM
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Registered
Join Date: Oct 2006
Posts: 452
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Just to clarify - idles well with cap OFF or cap ON?
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pozee |
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05-25-2009, 12:16 PM
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Registered
Join Date: Jul 2006
Location: Rescue, CA
Posts: 549
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Both items you described indicate it's running too rich. You can try adjusting as in this link under "Idle Speed Adjustment".
http://911chips.com/dmeconvr.htm
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Doug  84 Carrera Coupe - Black (the Goth look) The more I learn, the more I realize I don't know 
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05-25-2009, 12:19 PM
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rmc911
Join Date: May 2009
Posts: 3
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The cars runs great with the oil cap off???
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05-25-2009, 01:02 PM
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RETIRED
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Yup....sounds like your 710 cap shows that you have a leak someplace. I use a can of quick start sprayed VERY lightly in areas of suspect leaks. Idle change reveals suspect areas.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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05-25-2009, 01:10 PM
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Registered
Join Date: May 2006
Location: sacramento, ca
Posts: 98
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If it runs good with the cap off(which creates a vacuum leak, more air) I would suspect the car is way too rich. I would check to make sure cylinder head temp sensor for DME is plugged in and good, also make sure the air door in the air mass meter moves smoothly and is not stuck. I recently had a bmw that the door was not closing all the way and it ran terrible and would not idle. BMW used a very similar DME system for years
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1985 911 "turbo look" 2008 Foose F150 (free truck) 2002 Mercedes Benz S55 Last edited by chris57; 05-25-2009 at 06:34 PM.. |
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05-25-2009, 06:31 PM
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86 Carrera Coupe
Join Date: Apr 2008
Location: Holyoke, Massachusetts (western end of state)
Posts: 425
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What type of computer chip do you have. My 86 came with some sort of generic custom chip and ran very rich to the point it would sometimes flood the engine and cause it not to start. Purchased SW chip and all those troubles went away. Was tired of changing the oil as the gas would wash down into the case. Not only did the troubles go away but engine really pulls much better through the entire rpm range and it passed emissions. If I take it easy I get 27+ mpg. Just a thought if all else is OK under the hood.
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05-25-2009, 06:46 PM
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Da cab
