924Board.org

DouglasM · Joined: 15 Jul 2012 Posts: 19 Location: Surrey, UK

All, I bought the 500 quid 931 project that was on ebay a month or so ago, the one with the CGT kit on it. Anyway, it runs, just, but as soon as it warms up, (like 30 seconds) it dies and spits sputters, I can keep it running on throttle for a minute or two but then it just goes dead and won't restart until it cools off a bit. I checked the cam timing which appears correct, did a new cap and rotor, tried setting the ignition timing but it jumps around too much to set. Interestingly when I pulled the plugs they looked like they had a normal colour to them.. sort of chocolatey brown/ white. Vacuum also seems fine. Any suggestions? One thing I thought of was fuel starvation so I picked up a new filter but the old one's fittings are seized on so I am soaking in penetrating oil, any suggestions on getting these fittings free?

Any suggestions welcome as I really want to get this car running and get to the bodywork/ interior. It would be a shame to break another 931.

DouglasM · Joined: 15 Jul 2012 Posts: 19 Location: Surrey, UK

One more thing, compression is good and consistent across all cylinders...

- D

Grenadiers · Posted: Sun Jul 29, 2012 11:25 pm Post subject:

What year is the car?
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

DouglasM · Joined: 15 Jul 2012 Posts: 19 Location: Surrey, UK

Sorry, should have said, 1980 so S1.

- D

Grenadiers · Posted: Mon Jul 30, 2012 12:33 am Post subject:

Sounds like a fuel starvation issue, the cold start valve is working though! Read the Sticky on how to resurrect a 931 first.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Definitely replace the fuel filter. Make sure to get a good set of brake line wrenches or sockets, otherwise, you WILL round off the fittings if they're seized as you describe. When you replace the filter, be absolutely certain that you install it the correct way, which is with the arrow pointing TOWARD the windscreen.

You should also consider pulling the in-tank pump and flushing it out as well as draining everything out of the tank and giving it a good flush as well.

While you have the lines disconnected, the other thing I would do is disconnect the main feed and return lines line at the fuel distributor, and then also disconnect them at the junctions over by the fuel filter. Once you have these lines disconnected, blow them out with compressed air, blowing the air from the front to the back. Also disconnect the lines at the fuel accumulator, and then blow out the main and return lines that are fastened under the car, again blowing air front to back.

When you refill the tank, put in a container of Techron fuel system cleaner. Here in the states they come in sizes suitable for 12 gallons and 20 gallons. I always use the latter. Once you have the lines all buttoned back up, put the techron in FIRST. Then put in 5-10 gallons of good quality premium fuel to force good mixture of the techron into the fresh fuel.

Now, having said all that, you may have a clogged fuel distributor or warm-up regulator (WUR), so if these simple steps don't do the trick, you will need to get a CIS tester and conduct a proper CIS test to see what your system and control pressures are, both tested cold and then warm. Instructions here -> http://www.924board.org/viewtopic.php?t=35734

Good luck.
_________________
erstwhile owner of just about every 924 variant ever made

peterld · Posted: Mon Jul 30, 2012 10:55 pm Post subject:

Fuel filter arrow: depends on whether RHD or LHD!
Arrow should follow the fuel line towards the fuel distributor, so if the car is RHD, then the arrow will point towards the front of the car.
_________________
80/81 932/8 ROW

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

DouglasM · Joined: 15 Jul 2012 Posts: 19 Location: Surrey, UK

OK, so managed to get the fuel filter off, ended up cutting inboard of the fittings with a hack saw then using a nut cracker to split the fittings that are on the filter side, Luckily the genuine porsche filter comes with new fittings. The old filter was pretty clean but it does run slightly better. but still only runs smooth for about 20 seconds, pumps both sem to be working. I've ordered a CIS test kit and will start checking things as soon as it comes in.

- D