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Stalling when hot
For a little while now when I stop at a light after the car has warmed up, she will stall.
To keep her running I have to keep my foot on the gas. Is this an ISV problem or am I looking in the wrong place. When she is cold there are no problems at all. Any help would be appreciated. Thanks OTR
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(Mae) Red '86 944na- gettting new paint soon. (Abby) Black '86 944na- new addition to the family. |
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08-18-2009, 10:56 AM
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23 views and no one has a an idea?
Tell me I haven't stumped you guys.
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(Mae) Red '86 944na- gettting new paint soon. (Abby) Black '86 944na- new addition to the family. |
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08-19-2009, 12:54 PM
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Join Date: Jun 2003
Location: Phoenix, AZ
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check batt voltage, mine is just below 14, with a/c/fans and lights at operating temps and my gage is accurate, adjusted to a fluke dvm.
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87 951, K27/6, Almond Beige, 17" Turbotwist 87 944S, alpine white, 5sp died a violent death 84 944, silver/brown, auto, gone but not forgotten "may the force be with you" |
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08-19-2009, 01:29 PM
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Thanks but the voltage is fine, New batt. new alt.
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(Mae) Red '86 944na- gettting new paint soon. (Abby) Black '86 944na- new addition to the family. |
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08-19-2009, 01:31 PM
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PRMN944
Join Date: Oct 2007
Location: Portland, OR
Posts: 117
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I believed your Idle air control valve is the suspect. Try to get tested and get more
info on what its function of this part. |
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08-19-2009, 02:49 PM
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Location: Chicagoland
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ISV or...have u tried just dialing in the idle screw a bit more?
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08-19-2009, 03:21 PM
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Raising the idle was a thought, but that is not fixing the problem. As I said this only happens when she is hot. When she is cold she idles right at 950.
I will look into the Idle air control valve to see if it is working properly. Thanks guys. Just in case this is not the problem keep the suggestions coming. OTR
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(Mae) Red '86 944na- gettting new paint soon. (Abby) Black '86 944na- new addition to the family. |
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08-19-2009, 04:02 PM
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also have u checked yer o2 sensor and your DME's FQS dial. it could be that the three are just not working properly together to produce the right fuel mixture
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08-20-2009, 07:27 AM
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Location: Buffalo, NY
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Try the DME relay jumper for the heck of it. The extra stress from the heat may be causing some minor problems. Just one more thing you can rule out.
 Check your vac lines to make sure you have no leaks. Have you done a fuel pressure test and the leak down test? Inspect the rubber fuel line hose that runs from the fuel damper to the fuel rail. Check for any cracks at all. There is a lot of heat there from the cam housing. Just a few more things you can rule out.
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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08-20-2009, 07:50 AM
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yea normally a vac leak would make a higher idle. but if PO tried to compensate the higher idle by dialing idle screw all the way down, that could be a potential diagnosis.
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08-20-2009, 08:07 AM
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Just a little background to help with this.
I had a great PO on this car. All work was done at dealership. O2 was an early thought so I replaced it. No help. Also put in my spare DME relay, but again no help. New Vac lines. Car was running great. Then I had the great idea to replace the non-working heater control valve. When I did I dripped some water into the speed and ref connectors, shorting them out. Fixed that but that's when the trouble started. As I have said she runs great when cold or under power. The only problem is when she warms up and I stop at a light she wants to stall. So I have to keep my foot on the gas to keep her running. OTR
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(Mae) Red '86 944na- gettting new paint soon. (Abby) Black '86 944na- new addition to the family. Last edited by OnTheRun2; 08-20-2009 at 02:45 PM.. |
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08-20-2009, 02:34 PM
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