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Bryan S
Joined: 26 Nov 2016
Posts: 15
Location: Mesa, AZ
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 Posted: Wed Dec 28, 2016 11:07 am Post subject: 1982 with no fuel problem |
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Hello,
My 1982 931 that has not run in 10 yrs is finally cracking over but still not starting. I changed all the fluids and put some oil in each cylinder. It cranks but I'm not getting any gas to the engine compartment. I checked and I do not have voltage at the pumps (in tank and external). I believe this may be the fuel pump relay but I'm wondering if anyone has other suggestions. If the relay, can you point me to the location, how to check it and where to purchase one?
Thanks,
Bryan
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Bryan |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11723
Location: PacNW
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| Posted: Wed Dec 28, 2016 12:00 pm Post subject: |
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Bryan, this information is in the shop manual. You'll need one if you're serious about wrenching on this car.
The fuel pump relay can be bypassed with a jumper wire. The procedure and a picture of the relay panel is definitely on the board. I suggest doing a search for it.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Ian89C4
Joined: 01 Apr 2011
Posts: 561
Location: North Carolina
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| Posted: Thu Dec 29, 2016 1:40 am Post subject: |
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Check the two large ground "wheels" behind the main fuse panel. I believe that the fuel pumps ground here through the relay. They are usually quite nasty and need a good clean, may help your problem.
If the pumps do not ground there then the ground is in the back between the two rear lights along with a few others. Can't miss the 10mm bolt holding them down.
Same as Rasta, search for Haynes manual or the FSM online. It will help to diagnose, plus test your CIS system. You may also want to snag a CIS tester, only way to check the three fuel pressures that you need to to make sure the car is running as it should.
Google search is usually the easiest way.
Good luck!
Cheers,
Ian
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Ian Edgerly
North Carolina
Current:
1981 924 SCCA/ChampCar Weissach Race Car ("Serenity")
1987 924S ChampCar Endurance Car ("Der Weg")
1980 924 Euro ("Wahala") |
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Bryan S
Joined: 26 Nov 2016
Posts: 15
Location: Mesa, AZ
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| Posted: Thu Dec 29, 2016 8:27 am Post subject: |
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| Ian89C4 wrote: | Check the two large ground "wheels" behind the main fuse panel. I believe that the fuel pumps ground here through the relay. They are usually quite nasty and need a good clean, may help your problem.
If the pumps do not ground there then the ground is in the back between the two rear lights along with a few others. Can't miss the 10mm bolt holding them down.
Same as Rasta, search for Haynes manual or the FSM online. It will help to diagnose, plus test your CIS system. You may also want to snag a CIS tester, only way to check the three fuel pressures that you need to to make sure the car is running as it should.
Google search is usually the easiest way.
Good luck!
Cheers,
Ian |
Thanks. I tried to jump pins 30 and 78 on the fuel relay and now I do not have power anywhere on the fuse panel. Maybe I accidentally hit another pin. Is there a main fuse that feeds the panel? I was able to crank it over but now I have absolutely nothing when I turn the key.
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Bryan |
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2596
Location: MI
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| Posted: Thu Dec 29, 2016 11:58 am Post subject: |
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Make sure to clean the ends of the fuses and their seats in the fusebox for good contact..
FP jump should be 30-87..
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80 Turbo - Slightly Modified |
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Bryan S
Joined: 26 Nov 2016
Posts: 15
Location: Mesa, AZ
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| Posted: Thu Dec 29, 2016 2:43 pm Post subject: |
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| Fasteddie313 wrote: | Make sure to clean the ends of the fuses and their seats in the fusebox for good contact..
FP jump should be 30-87.. |
Thanks Fasteddie. Yeah, I meant 30 and 87. Any idea why I would have no power to the fuse panel? All I did was put the jumper in place and attach the battery. Then, I went back into the drivers seat and turned the key to find no lights on the instrument panel and it would not crank over.
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Bryan |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Thu Dec 29, 2016 3:03 pm Post subject: |
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The factory service manual (FSM) is handy, as Rasta suggested, but does not (in my opinion) provide an adequate troubleshooting protocol, especially for the 1981-82 (series 2, a.k.a. S2) 931.
May I suggest starting here: A Systematic Approach to 931 Diagnostics.
Also read this: 931 Resuscitation - how to resurrect a long-dead turbo
Supplement with the FSM and the Haynes as appropriate.
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erstwhile owner of just about every 924 variant ever made |
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Bryan S
Joined: 26 Nov 2016
Posts: 15
Location: Mesa, AZ
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| Posted: Thu Dec 29, 2016 10:54 pm Post subject: |
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Thanks! These threads have a lot of good info.
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Bryan |
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Bryan S
Joined: 26 Nov 2016
Posts: 15
Location: Mesa, AZ
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| Posted: Fri Dec 30, 2016 10:27 am Post subject: |
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It was the lug on the negative battery cable. The conductor was barely making contact to the lug. Now, back to the fuel problem.
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Bryan |
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