924Board.org

[McMichem]

I recently purchased a 931 and after having taken care of some other things I am trying to get it running.

The car will start after cranking for about 5 seconds, run rough and then stall. it doesn't matter how much throttle you give it, it has little or no response.
I am assuming I have some vacuum leaks but I think it is more of a fuel pressure issue that I want to check out first.

The only way the previous owner could get the car to run and continue to run was to hold the metering plate down a tiny bit, therefore opening the injectors and giving it the fuel it needs. Adjusting the afr screws to tune it so it opens the injectors then back off a little twist does nothing, they just won't open. Fasteddie suggested checking the "Pop up valve" so I plan on doing that when I get home.

Also I have been reading there is a cover for the screw, is the screw that big of a vacuum leak and would it throw off the engine that much?
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1980 931 ~ 67,000 miles

[Fasteddie313]

[ideola]

What you are describing sounds more like a fuel delivery issue to me, probably malfunctioning WUR, bad injectors, malfunctioning fuel distributor, or some combination thereof. The best (and IMO, only) way to troubleshoot is to start with a proper test of the CIS system. Tutorial here.
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erstwhile owner of just about every 924 variant ever made

[McMichem]

I don't think the correct amount of pressure was ever getting to the fuel dist.

I removed the fuel filter ( someone stripped the hell out of it) so I ended up having to break the fuel line to check it. But there is so much resistance I can hardly blow through it. Gonna replace that and the fuel line now >.> and hopefully it's that and nothing more.
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1980 931 ~ 67,000 miles

[ideola]

Make sure to install the replacement filter in the correct orientation, arrow pointing toward the windshield. Common mistake to put it on backward...
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erstwhile owner of just about every 924 variant ever made