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Registered
Join Date: May 2010
Posts: 58
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ruff idle when cold
my 85.5 has been running really ruff only when it is cold. has anyone had this and what did you do.The car runs fine as sone as it warms up.
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01-22-2011, 08:30 AM
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Registered
Join Date: Dec 2006
Location: ro
Posts: 143
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same problem here (same car) waiting to replace AFM to see if it will be better ...but also i think that until it will warm up ,not all 4 injectors are firing ...check that to see...
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-porsche 944 n/a 85.5 on Eaton M90 diet |
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01-24-2011, 10:39 AM
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find the O2 sensor and disconnect it and see if it stops, if it does than replace it. If not then...This is a fairly heavy topic on here. I also suggest a Google search, it seems to produce better results than the search function in here. Good luck and let us know what you find. I occasionally get the oscillating idle but never bothered to track it down.
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Paul - Norwell, MA 1985.5 944 Guards Red N/A Koni Sports, S2 sway bars |
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01-24-2011, 11:04 AM
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unindicted co-conspirator
Join Date: Jul 2007
Location: Fresno, CA
Posts: 1,660
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check the Idle Air Control Valve, it's probably stuck.
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'03 996 - sport exhaust, sport seats, M030 sport suspension, stability control, IMS Solution ‘86 928S3 - barn find project car |
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01-24-2011, 04:21 PM
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Registered
Join Date: May 2009
Location: Hawkinsville / Perry, Ga.
Posts: 1,239
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Hello, Check out the link below for a No Start Check List as it lays out pretty much what to check. It might help out with your problem. The AFM Wiper Arm may need to be adjusted to run in another track.
Let start a NO START checklist http://www.the944.com«·.htm Cheers, Larry
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Retired USAF and Civil Service, 1985.5 NA Graphite Metallic, A never ending work in progress, 1992 968 Horizon Blue Cab "New Toy" 
Last edited by Grandad#3; 01-27-2011 at 03:12 PM.. Reason: add |
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01-27-2011, 03:05 PM
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Join Date: Mar 2009
Posts: 483
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Could be the DME temp sensor. If I'm correct, it sends a signal to the computer to richen the fuel mixture until the car warms up. If it is not working correctly, it would not send the richen signal and could cause a rough idle. Cheap part to fix.
Pelican Parts - Product Information: 944-606-125-00-M323 |
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01-27-2011, 03:24 PM
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85.5 Guards Red
