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Join Date: Apr 2004
Location: Douglassville PA.
Posts: 407
Garage
944 is having a idle problem

Here is whats going on hopefully someone can lead me in the right direction.

I tried to start the car this morning and it just cranked, I waited 1 minute tried again and it fired right up. I pulled it out of the garage let it run 5 minutes shut it off and tried to restart. It did the same thing cranked and cranked, I let it sit 1 minute and it fired right up.

I then drove it for a little while and got some gas. I drove it somewhat hard and the car drove great without any noticeable problems. After the first 2 times I had no further problems getting the car to turn over the first time.

As it was idling in the drive way I noticed something after about 5 minutes it seemed like the idle dropped way low and wanted to stall out but didnt, 10 seconds later it did it again. I got in, revved the motor it was strong with no hesitation problems. 5 minutes later it did it again wanted to stall 10 seconds later did it again.

What could be the issue here ?? I did notice some water condensation blowing out the exhaust. I may try running a water remover with a bottle of Chevron Techron FI cleaner tomorrow to see if it fixes the problem. PLEASE HELP

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87 944
72 914 Sold
84 944 Sold
85.5 944 Sold
78 924 (first car) RIP
Old 03-11-2012, 05:33 PM
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Join Date: Jul 2001
Location: ~Carefree Highway~
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Wiz...

You could be correct that you got/have some bad gas and the "in tank" moisture remover might help. I would wait on the Techron FI cleaner.

Other causes may be a clogged fuel filter. When did you last change the fuel filter?

If your fuel filter is OK, pull the vacuum lines to the FPR fuel pressure regulator & FPD fuel pressure damper and look real close for any moisture of gas on the FPR or FPD or the vac connection.

If there is no moisture, try to start the car with one injector unplugged. If the car fires up you need to check the FPR & FPD again. One could be bad.

Just ideas.

GL
John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo)

Last edited by John_AZ; 03-11-2012 at 08:16 PM.. Reason: O to o
Old 03-11-2012, 05:59 PM
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The filter was changed about 2k ago.
__________________
87 944
72 914 Sold
84 944 Sold
85.5 944 Sold
78 924 (first car) RIP
Old 03-11-2012, 06:16 PM
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Proprietoristicly Refined
 
John_AZ's Avatar
 
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,831
(lots) more background information in PDF form from RL Rennlist:

http://members.rennlist.org/dan10101/docs/F_PRESSURE.doc

John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo)
Old 03-11-2012, 06:18 PM
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Join Date: Apr 2004
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thanks

__________________
87 944
72 914 Sold
84 944 Sold
85.5 944 Sold
78 924 (first car) RIP
Old 03-11-2012, 06:42 PM
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