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Porsche 944 and 924

86 messages,  Last post on Nov 05, 2009 at 5:35 PM

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#77 of 86 Re: Electrical problems [dark944] by tdouble Aug 01, 2009 (10:34 am)
Replying to: dark944 (Jul 21, 2009 4:28 pm) Hey thanks again for replying . I figured it out it was a bad connection from one tail light to the other. i ran a new wire and viola all my lights work.
#78 of 86 Re: Battery not charging [tdouble] by dark944 Aug 04, 2009 (11:12 am)
Replying to: tdouble (Aug 01, 2009 10:28 am) tdouble, not sure on the ignition wire. I would check your batter cables though. Just because they look good on one end or the other. the cable could be full of corrosion under the shrinkwrap. This could stop the flow of juice back to your battery. Just cut into a section behind your cable where it is shrink wrapped. Open up the shrink wrap and look at cable. The cable should be shiney, if its is full of green or brown crud then i would say just buy a new cable. If cable looks good then just get some electrical tape and wrap the cut section back up.
#79 of 86 exhaust fumes [msim] by demonpedro Sep 11, 2009 (12:50 pm)
Replying to: msim (Jul 15, 2009 8:04 am) Hi Doug, Hi msim. I'm led to believe that when you open a window or sun roof in the 944, it creates a differential pressure in the cabin. This tries to 'suck' hot engine air (not exhaust) in through the gear lever housing and gaiter. With a good seal on the gaiter, no fumes but a lot of heat. With any gaps, engine air gets in and smells. How dumb - open windows and it gets too hot. Haven't heard of a fix but I would havr thought that some sort of heat deflector could be rigged up under the gear lever ???
#80 of 86 924S Fuel Pump Problem by pdunk2009 Sep 16, 2009 (6:10 pm)
I'm replacing the fuel pump and even though the new battery has 12.6 volts there is only 9.8 volts at the pump terminals with the pump hooked up. And it will not run and pump fuel. Out of the car the pump runs fine using a battery charger or battery and there is 12.6 volts at the pump terminals. If I'm losing voltage through the pump relay is there anyway to test the relay to see it it's the problem? Replies to this message: todd82ta (Sep 17, 2009 4:08 am)
#81 of 86 Re: 924S Fuel Pump Problem [pdunk2009] by todd82ta Sep 17, 2009 (4:08 am)
Replying to: pdunk2009 (Sep 16, 2009 6:10 pm) Honestly, they go bad quite frequently. It's the DME relay in the fuse panel.   The only way to really test it is to take it out and use a continuity voltage tester on it by providing switched power and a continuous hot and then just measure the voltage going into it and out of it.
#82 of 86 944 1984 by ohio1948 Oct 06, 2009 (1:23 pm)
I changed fuel pump and still not getting fuel, I have dme fuel relay but there are multiple relays under dash. How do I know one from the other? One relay is now causing a continuous buzzing when battery is connected after I removed that first relay at top left and plugged back in. Replies to this message: todd82ta (Oct 06, 2009 5:01 pm)
#83 of 86 Re: 944 1984 [ohio1948] by todd82ta Oct 06, 2009 (5:01 pm)
Replying to: ohio1948 (Oct 06, 2009 1:23 pm) Ok, what I'm going to tell you is ABSOLUTELY the best way to rule out ALL possible problems. It will tell you A) if your fuel pump is good, B) if your ECM is good, and C) if your car is actually running.   What you need to do is wire your fuel pump up manually. You can do this temporarily by feeding a wire through one of the drain holes in the rear fender (on the passenger side where the fuel pump is). Feed that wire through the inside of the car and have it coming out of the door jamb, into the cowl and hook it up directly to the battery.   What you do is wire it up to the fuel pump (disconnect the lead on the fuel pump) and then get ready to start your car. Pop the hood, and hook that lead up directly to the batery. This will ENGAGE the fuel pump and the fuel pump will be running. At this point of course, the car will be off and the key will be in the OFF position. The fuel pump CAN run with the car off, it simply maintains pressure in the system.   Now, make sure the wire is secure, get into the car, and try to start the car. If the car starts and runs, then you know all three things are true: A, fuel pump works, B: the car's ECM / Computer is good, and C: the car actually runs, which tells you all the OTHER possibly positives like... it's not a problem with the crank position sensors, or the AFM meter, or anything else.   That will tell you RIGHT then and there that it's the DME relay.   I sold my Porche a year ago so I can't tell you for sure which relay is the one that's the DME relay. I DO however seem to recall that it was the BIGGEST one that was located on the SECOND ROW in the back.   Anyway, the above method is only TEMPORARY. You don't really want to do any driving around like this other than what is absolutely necessary. This is how I worked out all the problems on my own car (also an 84 Porsche 944).   Trust me, it will be a huge relief to you when you get the car running at this point. If you do need new crank position sensors, you'll want to get the BMW replacements. They're the same as the Porsche ones, but 1/3rd the price. (worked on my Porsche and the car ran AWESOME). Check it out under the tech articles at http://www.PontiacPerformance.Net
#84 of 86 944 electrics by 944project Nov 04, 2009 (2:18 pm)
People heres one for you. Got a 85 944 lux 2.5 auto the fuel pump relay has been by passed hence its running all the time, headlamps have been dim for 15 years and the previous owner has run the live from one to feed the other, that has been cut out, the h lamp switch when pressed on activated the h lamp motor, the live for the pump has been breached into the live from the washer jet motor. What electrics worked, side lamps, indicaters, reverse lamps and stop and tails electric windows dash lamps,rear fog lamps have never worked. the washers have been wired onto a switch on the centre console and all relays work (no AC not fitted) Yes the car is a project but a do-able one new auto box wheel bearings, torque converter and lots more.   The problem, have changed the fuse boards wire for wire and checked the relays all ok a bit of a burn out on number five block at the first pin on the bottom and centre of the block, rewired soldered and lengthened, feeds going to all the main lives and voltage checked all pushing 13.5 plus volts, took clocks out and the rear mister wire has been breached to feed the fuel pump live??? i know, i now have clock, interior lamps no window motor and the main beam comes on when the left stalk is pulled towards the driver, no pop up lamps when h lamp switch pressed and still no rear foggs, all earth checked. I need to know the colour of the wires to the fuse board in order to chase the problem but unable to get the relevent colour codes andiagrams, haynes manual crap, Any ideas Porsche enthuasists. Replies to this message: todd82ta (Nov 05, 2009 6:15 am)
#85 of 86 Re: 944 electrics [944project] by todd82ta Nov 05, 2009 (6:15 am)
Replying to: 944project (Nov 04, 2009 2:18 pm) Hey 944project, my reply won't really be much help in terms of solving your problem, but it's a better idea of how to tackle these problems. Rather than focusing on the big issue, a better way to look at it is to try to fix each "system" seperately. For example, if your windows don't work, then focus on fixing JUST that, first.   Unfortunately, you're probably going to have to tear out most of the interior to expose a lot of the wiring. I would even recommend maybe removing the dash so that you can have easy access. The dash is NOT hard to remove. It's only attached by 4 or 6 philips head screws if I remember correctly. You should have easy access to all of the wiring.   You can actually TEST all the wiring (at the doors) where they connect to the harness inside the car by hooking up the leads to a 9 volt battery. A fresh 9 volt battery will provide enough power for you to be able to test the up and down motion (if this works, then you know that you won't need to open up the doors). You can also use a car battery with leads attached of course too.   Anyway, once you've tested the wires at the door, you can then follow the harness all the way back behind the dash and to the fuse panel. I'm willing to bet that more than likely the problem is relays. The relays in the Porsche 924 / 944 are notorious for failing, plus the fact that the car is already 25 years old...   Porsche rather over-engineered this car, and by doing so made it less reliable than it could have been. Almost everything is on a relay, and if you have an 85 vs an 85.5 then you have the old fuse block too... (if you have the old style interior, then you've got the old wiring harness).   Anyway, I hope that helps some. Try to focus on one system at a time... you're going to have to take apart your interior (it's not hard, I gutted mine and then put it all back) in order to properly trace the wires.   Good luck...
#86 of 86 Missing by hawaii9 Nov 05, 2009 (5:35 pm)
I have an 86 944, with a bunch of electrical problems. First the windows quit. That was some time ago. Recently I lost the wipers, both front and rear. The fogs have gone, the air blowers,and the ect. mirrors. I first cleaned 6 of the 7 grounds, checked all the fuses, and then all the relays for continuity,and cleaned the lugs, every thing checks out fine. I did find a squat item in with the relays called "spare links" Could this be the problem? can't figure out hoe to check it. Can anyone help with this? I have no idea what to do next. Help!!!   Thanks   Paul

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