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stang2u · Joined: 12 Jan 2003 Posts: 19

Finally got the porsche to start after replacing fuel distributor and fixing all the vacuum lines.But after we got it running was going to fix the rough handling but had to stop working on it for a couple of weeks.Now it tries to run but dies as soon as gas pedal is touched.We are looking at the fuel accumulator and fuel filters now to see if they are clogged or if there is water in the fuel system.Anyone have any ideas or had this happen to them.

Joes924Racer · Posted: Fri Apr 30, 2004 6:20 am Post subject:

I had a rusty tank fouled up the whole fuel sys. for quite a while.
did the same thing. I went on quite a tear to track it down
goin through the system till I was told it was the fuel dizzy
I took it apart and cleaned it up and changed the pressure
among other things,accluminators too.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

Jazzerpet · Joined: 07 Apr 2003 Posts: 186 Location: Omaha, NE.

Check your pressure. Can you keep it running long enough for it to warm up? If so does it smooth out on idle? I had this problem with my 77 turned out to be the WUR.
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1980 931
1985 ½ 944
Member of the “Omaha Crew”

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

I "second" the question about will it idle long enough to warm up, and then does it respond when you give it gas? If it still dies, I too would suspect the WUR, but it's a pricey part to change out without really testing it first. It's possible that with the fuel distributor being rebuilt/replaced, the actual air/fuel mixture is now different than it was and might be causing or contributing to the problem. IMO I think it unlikely that you have an actual delivery problem with the distributor seeing it's just been replaced.

Yes, there is the possibility the filter is clogged, but I wouldn't think that it by itself will cause the engine to die "on the gas". If you've got a CIS tester, hook it up and see what values you get.
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'79 Eurospec 931

stang2u · Joined: 12 Jan 2003 Posts: 19

Unable to get it to stay running long enough to warm up, it starts and then dies.

CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

I'd start by pulling the injectors, putting them in jars, jumpering the fuel pump and raising the airflow sensor. Look at the injector's pattern and measure their output.
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'79 Eurospec 931

stang2u · Joined: 12 Jan 2003 Posts: 19

nothing is coming out of the injectors.Pulled them and are cleaning them out

stang2u · Joined: 12 Jan 2003 Posts: 19

nothing is coming out of the injectors.Pulled them and are cleaning them out

Roger · Joined: 06 Jan 2003 Posts: 1235 Location: Cordova, TN

Nothing comming out of the injectors would lead me to belive an electrical problem. Pull the fuel return line put it in a gallon milk jug, and jump the fuel pump contacts for the fuel pump relay. 750 cc per 30 seconds.

If the fuel delivery rate is low try replacing the fuel filter, and retest. If the fuel delivery rate is still bad then its most likely the fuel pump.

If the fuel delivery rate is good try starting the car with the jumper wire still on. If the car runs good with the jumper wire its the relay.
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1981 924 NA

Some people are like Slinkies. Not really good for anything, but you
still can't help but smile when you see one tumble down the stairs.

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

When you installed your new distributor, how did you set the airfuel mixture. It sounds like the mixture is set way too lean.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

Roger · Joined: 06 Jan 2003 Posts: 1235 Location: Cordova, TN