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Porsche 944 and 924

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

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#74 of 86 Re: Electrical problems [dark944] by tdouble Jul 20, 2009 (5:04 pm)
Replying to: dark944 (Jul 13, 2009 9:37 am) Thanks for replying dark944 . I've checked all my fuses, replaced all my lights and my switch. still no changes tho . think i might have to goto to the shop. Replies to this message: dark944 (Jul 21, 2009 4:28 pm) tdouble (Aug 01, 2009 10:34 am)
#75 of 86 Re: Electrical problems [tdouble] by dark944 Jul 21, 2009 (4:28 pm)
Replying to: tdouble (Jul 20, 2009 5:04 pm) Hey t I have one more thing you might look at. I have been going through my car all over even tore the dash apart looking for a frayed wire or short. Looks like my problem was one of the big relays in the fuse box. I pulled out one G15 I believe. It is labeled instruments and light relay in the fuse box. Well the ends of it were blackened. i scraped them back down to shiney metal and plugged it back in. My brake lights and dash came back to life. So i would check some of those they may just be dirty and not have a clean connection. Replies to this message: tdouble (Aug 01, 2009 10:34 am)
#76 of 86 Battery not charging by tdouble Aug 01, 2009 (10:28 am)
Heres my problem. I've got a 1984 944 w/ a new battery and rebuilt alternator. Everything was running good and all the sudden the battery will not charge. i've tested the alternator and it is good. I tested the ignition wire ( wire that goes from ignition to alternator) with the key in the on position and it is not giving any power out. is this my problem? Replies to this message: dark944 (Aug 04, 2009 11:12 am)
#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

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