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Help! Runaway idle speed
Hello, I'm having some issues with my newly rebuilt engine and am hoping for some forum wisdom. Occasionally, my engine's idle speed will start running away and I have to get off the road and shut down before it gets too out of hand. This only seems to happens when the car is warmer (LA traffic), and always returns to normal once I restart the engine. I'm thinking it may be an Idle Control Valve or Fuel Pressure Regulator problem. Thoughts?
My car is a 90' 964 with 993 vram/injection/DME/Wong chip. 
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03-07-2015, 10:38 PM
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2nd problem
Second problem is that the engine seems to choke up if I move the accelerator too quickly. As in; when 'floored' the engine will make stuttering noises and not give any additional power, but if I roll accelerator on slowly the engine seems to keep up just fine.
Thanks -Sam 
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03-07-2015, 10:41 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,078
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not a whole lot to go on, My guess "false air"
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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03-08-2015, 01:27 AM
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Air is entering intake past the what ever air monitoring system you have.
Maybe a leak at the intake runners where as the car heats up gap opens. I had something similar on my race car. Mike
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2015 Panamera Hybrid, 2008 Cayenne Twin Turbo 2001 996 GT2 1999 Spec Boxster, 1996 993 Cabriolet 1992 964 Cabirolet, 1975 911 RSR Replica Race Car |
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03-08-2015, 07:09 AM
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Did some more experimentation today regarding issue 2 (choking under WOT at higher revs and load conditions); I think it may be a bad resonance flap or something else internal in the varioram. Any ideas?
And thanks for the above replies, I agree that 'extra air' finding it's way in could be an issue, but I still thinking it seems like something's getting stuck then resetting once I restart. So Idle Control Valve or throttle linkage/bell crank. Thanks again. -Sam |
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03-08-2015, 10:22 PM
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And Mr. Afterburn 549, we should talk helicopters.
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03-08-2015, 10:24 PM
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