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Change in Idle RPM's
Lately, after my 85.5 944 has warmed up, the idle RPMs go up and down, from about 700 to 900 and back to 700, very steady increase and decrease. There is no shudder at the low point, just and increase back up again. It goes away if I increase idle speed to about 1400. What's up with that? A bad vacuum hose? and if so how can I check for sure without replacing them all? I've suspected slight problems with my AFM but have no ammeter & wouldn't know how to use it without shop manuals.Car runs great with throttle wide open. Any ideas?
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10-30-2002, 05:15 PM
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Vacumm leak is a good possibility.
Check the boot between the AFM and the throttle plate for cracks or holes. Check the AFM for proper operation. Check the TPS for correct operation. Chances are it lies somewhere in one of these components.
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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10-30-2002, 06:53 PM
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Don't for get the fuel pressure regulator and dampener
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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10-30-2002, 07:15 PM
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1985.5 Porsche 944 2.5L 
1985.5 Porsche 944 2.5L Supercharged 
911 SC
Panamera
1983 Porsche 944 2.5 liter
