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Registered User
Join Date: Oct 2005
Location: Birmingham
Posts: 79
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DME trouble?
Do DME relay's go bad? My 1990 911 shuts off when I stop at red lights, stop signs, etc.? The guy that had the car before me changed the DME, O2 oxygen sensor, set fuel mix, and replaced the idle speed control valve. It is still doing the same thing. Any suggestions.
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10-12-2005, 09:19 AM
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durn for'ner
Join Date: Feb 2005
Location: South of Sweden
Posts: 16,915
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If the DME is shot I donīt think your car would start at all.
Head temp sensor ??
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Markus Resident Fluffer Carrera '85 |
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10-12-2005, 09:30 AM
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Registered User
Join Date: Oct 2005
Location: Birmingham
Posts: 79
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The car starts and runs fine until I come to a stop. It is especially frustrating when I slow down (coming down a hill or mountain) and the engine shuts off.
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10-12-2005, 09:39 AM
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Registered
Join Date: Dec 1999
Location: Ft. Lauderdale
Posts: 1,170
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Idle switch possibly. Check this thread over on Rennlist: http://forums.rennlist.com/rennforums/showthread.php?t=224986&highlight=idle+switch
Post your findings... Good luck.
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Thomas Owen 1972 911T |
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10-12-2005, 11:26 AM
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Registered User
Join Date: Feb 2003
Location: Plano, TX
Posts: 1,085
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Yes, DME relays go bad and its a common problem. If you still have the original DME, you are due for a failure. The problems you describe could very well be caused by a bad relay. When they die, they act intermittently versus a sudden and absolute death.
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1983 911 3.6L - NASA GTS-3 class 1998 Boxster - PCA SpecBoxster, NASA GTS-2 2003 996X51 - NASA GTS-4, PCA GTB 2003 996 Carrera 2 Coupe 2003 Ferrari 575M |
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10-12-2005, 11:44 AM
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Registered User
Join Date: Oct 2005
Location: Birmingham
Posts: 79
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It was changed out last year. Is is possible that it is out again?
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10-13-2005, 07:52 AM
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Registered User
Join Date: Feb 2003
Location: Plano, TX
Posts: 1,085
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Quote:
In the meantime, check all the connections in and out of the DME box and make sure they are clean and tight. Corrosion is another possible cause of the symptoms you describe.
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1983 911 3.6L - NASA GTS-3 class 1998 Boxster - PCA SpecBoxster, NASA GTS-2 2003 996X51 - NASA GTS-4, PCA GTB 2003 996 Carrera 2 Coupe 2003 Ferrari 575M |
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10-13-2005, 08:01 AM
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Registered User
Join Date: Nov 2004
Posts: 98
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DME could very well go bad in a year's time. It's a low cost replacement and replacing it will eliminate it as a fault variable.
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Coral Red Syd - "For Those Who Love to Fly... On The Ground" |
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10-13-2005, 08:21 AM
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Registered User
Join Date: Feb 2004
Location: LaGrange, NY
Posts: 1,279
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Change your plug wires. I had an Audi 4000 withthe same problem.
Lots of arching, visible at night only, nothing in the day, that was causing the cars electrical system to shut off similar to yours. Maybe watch it run in the pitch dark night.
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Looking for 87-89 Silver Cab 911, black interior, must be low miles, near pristine, no accidents, well sorted. |
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10-13-2005, 08:24 AM
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Registered User
Join Date: Sep 2001
Location: Connecticut US
Posts: 184
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Check to see if the idle control unit is being switched on when the throttle is closed.
With the engine stopped, open the throttle a little by hand and you should hear the switch. Verify operation at the connection to the Idle Speed Control. For starters, increase the idle speed by turning the control screw on the front middle of the throttle body'
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Ned NYNA 11 87 Carrera targa 98 BMW 528i 98 Volvo V70 |
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10-13-2005, 09:47 AM
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