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931 starts easily and then dies

 
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Michael Kouridakis  
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PostPosted: Tue Aug 21, 2001 6:19 am    Post subject: Reply with quote

Hey Guys, more questions:

My '82 931 starts very easily when cold but dies after a few seconds. I have to start it 4 or 5 times and get on the throttle to keep it running. After that it runs ok when warm except for a miss. Could it be the cold start injector? The WUR? Aren't the injectors supposed to hold pressure when off? What up with this?

On a bright note, I cna't believe how fast this thing is! I like my 914 but it aint as much fun to drive as the 931. Doesn't have the same kick in the pants.
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numbers  
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PostPosted: Tue Aug 21, 2001 6:33 am    Post subject: Reply with quote

Hot start or cold start?
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Michael Kouridakis  
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PostPosted: Tue Aug 21, 2001 6:41 am    Post subject: Reply with quote

Cold start only. Hmmm. Cold start injector?
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larso  
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PostPosted: Tue Aug 21, 2001 7:06 am    Post subject: Reply with quote

if it keeps dieing even when you have your foot on throttle, the mixture is out, caused by the WUR, the WUR controls mixture.

Either that or your mixture setting is off, but if it runs ok hot...well if it acts up at all when hot then mixture is off or timing or something too.
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Michael Kouridakis  
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PostPosted: Wed Aug 22, 2001 4:08 am    Post subject: Reply with quote

It has a slight miss at speed. I'll have to try a new WUR. The car died on me today about a mile from home. It backfired once then about 100 yards down the road it just quit. It turns over easily (brand new battery)-- no spark, no fire. I believe that my fuel guage is working. I'll put some fuel in the tank and try it again. ARRGGGGG!
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dpw928  
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PostPosted: Thu Aug 23, 2001 12:47 pm    Post subject: Reply with quote

Michael,

The cold start valve is supposed to turn off after a few (no more than 12) seconds. You either have low control pressure (bad WUR) or low system pressure (bad fuel pump, relay, plugged filter, etc). Since you are missing when warm, my guess would be low system pressure. To test for a bad relay jump the #30 and 87 relay sockets then check the pump to see if it's running. If it still doesn't start check the fuel pump by measuring it's output when turned on for one minute. The output volume should be listed in the Haynes manual. You have changed the filter haven't you? If you have good system pressure yo will need gauges to test the control pressure (WUR).

Good luck. BTW do I get a star for posting? LOL

Dennis
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Peter_in_AU  



Joined: 29 Jul 2001
Posts: 2743
Location: Sydney, Australia

PostPosted: Thu Aug 23, 2001 2:07 pm    Post subject: Reply with quote

Dennis,

I was going to nominate you for a star but then I noticed your handle and the excessive number of 928s.
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edd1em  
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PostPosted: Fri Aug 24, 2001 3:45 pm    Post subject: Reply with quote

What is wrong with a 928? Eight cylinder porsche? One of the few!! and you call yourself a porsche fanatic...
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