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goldhunter_2

I took out the DME fuel pump relay 993.615.227.00 I tried the jumper wire on number 2 and 8 (30 and 87 on the 924's) still don't have power at the fuel pump and I can put a test light in the jumper wire and have power on both sides of the jumper wire. It shouldn't matter but tried it anyway I pulled the relay form my 924 and put it in this car still noting but had to do just to say I did....lol

Next I traced the wires form the pump at the back up along the bottom of the door then lose them behind the side and in the jumbal of wires behind the fuse panel , I have the fuel pump relay out and a jumper wire in #30 an #87 (actual 2 and 8 for my panel) and have power at that point but not at the pump, the aux fuse panel #2 fuel pump fuse is good.

At this point I am assuming that some where between the wiring harness running along the drivers door bottom and the fuse panel there is a short or cut ................. is that a straight wire to the fuse panel or is there any other connection in there? I already have the broken hood latch handle and truck button out but How do I get the drivers side bottom front carpet part off so I can look for damaged wires?

any other ideas???????????????

Oh ya , other recent information I don't think it matters but just in case, I have replaced the gas tank, removed the trans axle an replaced the fuel sending unit , filter , in-tank screen, fuel pump , I have taken fuel pump back off to test and works fine when it get power
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1982 Porsche 924
1984 Porsche 944
97 suburban -- tows everything I trailer
WPB Airboat ----- goes anywhere I point it

Brian L. · Posted: Wed Jul 06, 2011 3:03 am Post subject: Check the Ground

Found this out by accident just yesterday. While letting the engine warm up I was sorting out a tail light that wasn't working. On the inside of the car between the two tail lights (closer to the drivers side) there is a four prong ground tab (some call it a crown) thats spot welded to the rear panel. They looked a little corroded so I pulled them off one by one to clean them and when I pulled the second one the engine died and when I quick tried to put it back on I could hear the fuel pump start back up. The short story is if you are getting power at the relay then check that ground tab at the back of the car. Hope this helps.

P.S. There is a much larger crown (more ground attachments) spot welded under the dash. You have to lay on your back and look behind the fuse / relay board and look for all the brown (ground) wires going to this location. I solved some of my ground issues (fast turn signals) by cleaning these ground tabs and then coating with a light film of grease to keep the corrosion away hope this hepls.

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1980 924 N.A. Monaco Blue owned since 1987
"Remember, sitting on your ass won't finish your project" -Puddins fab shop.

goldhunter_2 · Posted: Wed Jul 06, 2011 3:22 am Post subject:

thanks Brian but it wasn't that but I'll keep it in mind if I have any more problems and I feel kinda stupid but who would have known there is a third fused thing.

I just found it , now someone please tell me what the proper name is so I can order one

there are three red wires and one brown wire that run form the aux fuse panel back up under the dash to a leather pouch it has a small square box with four prongs one red wire is hot but the other red wire that runs to aux fuse panel fuse #2 is not if I pull that wire off and jump it on the hot wire I can heat the fuel pump run . there is NO parts numbers on this black box it only have 12V 30A stamped on top what is the proper name for this part so i can get one ????????????????
_________________
1982 Porsche 924
1984 Porsche 944
97 suburban -- tows everything I trailer
WPB Airboat ----- goes anywhere I point it

goldhunter_2 · Posted: Wed Jul 06, 2011 3:31 am Post subject:

thanks Brian but it wasn't that but I'll keep it in mind if I have any more problems and I feel kinda stupid but who would have known there is a third fused thing.

I just found it , now someone please tell me what the proper name is so I can order one

there are three red wires and one brown wire that run form the aux fuse panel hidden way back up under the dash in a leather pouch it has a small square box with four prongs one red wire is hot but the other red wire that runs to aux fuse panel fuse #2 is not hot but if I pull that wire off and jump it on the hot wire I can hear the fuel pump run.

There is NO parts numbers on this black box it only have 12V 30A stamped on top what is the proper name for this part so i can get one ????????????????
_________________
1982 Porsche 924
1984 Porsche 944
97 suburban -- tows everything I trailer
WPB Airboat ----- goes anywhere I point it

Ozzie · Posted: Wed Jul 06, 2011 10:06 am Post subject:

that just sounds like a relay.
extra control for security/immobiliser?
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

goldhunter_2 · Posted: Wed Jul 06, 2011 10:34 am Post subject:

someone else said to just ask for a standard botch 30 am four prong relay
_________________
1982 Porsche 924
1984 Porsche 944
97 suburban -- tows everything I trailer
WPB Airboat ----- goes anywhere I point it

ptheskil · Joined: 03 Aug 2004 Posts: 128 Location: Essex, UK

I don't remember an additional relay in the FP supply in any of the wiring diagrams I've seen. Would guess that it is from some previous aftermarket anti-theft/immobiliser. In that case bypass it altogether and put the wiring back to standard. The fewer things to go wrong / add resistance to the FP supply the better.
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1981 931 series2 Euro spec

goldhunter_2 · Posted: Thu Jul 07, 2011 3:04 am Post subject:

I couldn't find it in either books wiring diagrams but I have the same switch in both the 924 and the 944 so I gotta think it is standard , it doesn't look like anything that was added in there.

I just picked one up at the parts store an I'm going to go put it in the car in a little bit and see what happens.
_________________
1982 Porsche 924
1984 Porsche 944
97 suburban -- tows everything I trailer
WPB Airboat ----- goes anywhere I point it

goldhunter_2 · Posted: Thu Jul 07, 2011 3:34 am Post subject:

nope car still will not start the engine just spins over

but the fuse did fix the power to fuel pump when cranking
_________________
1982 Porsche 924
1984 Porsche 944
97 suburban -- tows everything I trailer
WPB Airboat ----- goes anywhere I point it

Ozzie · Posted: Thu Jul 07, 2011 8:02 am Post subject:

After fuse 2 on the aux fuse box it should be a direct feed to the fuel pumps.

Anything else is aftermarket and if it dont work, take it out.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

goldhunter_2 · Posted: Thu Jul 07, 2011 8:58 am Post subject:

that relay is actual before the fuse not after it

I got the car running but really really really rough at ideal and every time you shift gears upper RPMs it seems ok guess that is more to figure out but at least this one is finally running again (kind of sounds like a old 46 willis jeep..lol)
_________________
1982 Porsche 924
1984 Porsche 944
97 suburban -- tows everything I trailer
WPB Airboat ----- goes anywhere I point it

Ozzie · Posted: Thu Jul 07, 2011 9:12 am Post subject:

According to the wiring diagram there should be nothing between the main fuse box and relay and the aux fuse box.

Sounds like you need to adjust the AF mix, timing and idle settings.
Only do it after its warmed up.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance