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Registered User
Join Date: Aug 2013
Posts: 1
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My 81 928 has fuel,pressure and spark but will not run
I have gone through the systems and have pressure, the pump runs the regulator and bypass are new but the engine only runs if I put primer in the air intake. Is that a relay issue or something else? It started out failing to start on a couple of drives. I released pressure from the fuel rails while checking for fuel pressure (parking lot at grocery store)and it would start. Now it won't even start unless primed and it will run for about 20-30 seconds once primed. Then it just stalls.
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08-11-2013, 04:32 PM
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Moderator
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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08-11-2013, 07:55 PM
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check compression
similar issue happened on a local 928 here in Austin and it turned out to be a dislocated camshaft. mike
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2015 Panamera Hybrid, 2008 Cayenne Twin Turbo 2001 996 GT2 1999 Spec Boxster, 1996 993 Cabriolet 1992 964 Cabirolet, 1975 911 RSR Replica Race Car |
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08-11-2013, 08:22 PM
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welcome to my world I have same year with same problem replace fuel injector relay found mine on ebay 14 bucks ordered monday came thursday was driving friday morning
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08-12-2013, 05:28 AM
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Registered
Join Date: May 2010
Location: Magnolia TX, just north of Houston
Posts: 369
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another thing to check is make certain the WUR (barndoor) sensor is properly down in its o ring. It is pretty easy to not seat it properly when placing the lower half of the air cleaner back in the car....the WUR tells the computer it is closed as there will be little or no vacuum and there fore does not fire the injectors. Prime it and it will run for a bit. Don't ask me how I and a buddy learned this, the very hard way....
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1956 Intermeccanica 356 Speedster (sold),1957 Intermeccanica 356 Speedster (sold),,1985.5 Porsche 944 (sold),1955 Thunder Ranch 550 Spyder (sold), 1955 Outlaw 356 Speedster (currently in build out), 1984 Porsche 928S (White), 1984 Porsche 928S (Red) Last edited by tmpusfugit; 08-12-2013 at 07:37 AM.. |
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08-12-2013, 07:28 AM
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Try spraying in a good dose of starting fluid, see if it will idle. If it will, your injector computer is not functioning. May be a loose ground on the pax valve cover above the letter "O" under the supplemental air valve. Very hard to see. If loose, I recommend relocating it to the forward hole on the same valve cover, that way you can actually see it for inspection later.
That is, if your model is like my old 82.
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1982 Porsche 928, Auto, 4.5 http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945 |
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08-17-2013, 10:52 AM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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FWIW since you have already figured out the part to make the car run is fuel,
dont spray more flammable liquid into the intake to test it. From the info provided, first replace or swap the relays as this is usually the issue, next would be a failing fuel pump , also the green wire is suspect if its original
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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08-17-2013, 11:40 AM
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pain in my wallet
Risky Bidness
