Bad DME??? 1984 944 nonturbo

spyder918 · 09-08-2008, 05:39 PM

I have a 1984 nonturbo 944 that I got as a project car. I was told it need a fuel pump which was accurate and I replaced along with other fuel components that were bad ie injectors. The coil was also in need of replacement.

So at this point I have been doing lots of research on this car because I made the mistake of listening to a mechanic who thought he knew what was wrong and think I replaced a few parts that didnt need to be like the mass airflow meter.

I have spark and fuel when I start the car. The car will start and stay running if I keep the key in the start potion (i have a kill switch on the starter as to not burn it up). When the key is released to the run potion, the car dies. I am stumped except to say that I have no real way to test my DME. I dont know anyone else in the area personally that would let me try my DME in their car or vice a versa. I'm hoping that someone knows how to test a DME or could unplug theirs and let me know how the car reacts while trying to start without the DME.

Any suggestions are welcomed. I really want to get the car running so I can continue the work I started on the interior and drive it!!!!!

Thanks to all that post.

Outback Porsche · 09-08-2008, 06:57 PM

I don't think your DME is bad as it probably wouldn't run after starting.

Replace your ignition switch. Part No. 111-905-865L.

wilde1 · 09-08-2008, 06:58 PM

sounds like a bad ignition switch. but i had dme nightmares of my my own. i bought a used one from a member and it solved my problems( after being at a porsche dealer for 3 months( and he told me my dme was fine) i just guessed and that was the problem) you should replace your dme relay first or at least jump it to rule out simple problems first

hpservertech · 09-08-2008, 07:30 PM

Like others have said, have you tried to replace the cheapest part first? And get rid of that kill switch too.

spyder918 · 09-09-2008, 04:41 AM

Yes I have replaced the ignition switch and the DME relay. I even thought maybe I got a bad DME so I made the three way wire and jumped it. Nothing seems to alter the problem at this point. Which is why I think it could be my DME. It could also be a wire. I wouldn't know how to begin testing for that. It had an after market alarm installed which had the kill switch for the starter. I removed all components of it. Didn't change anything. Is there anyway that I can test the DME plug to see if it is getting proper voltage where it should?

hpservertech · 09-09-2008, 07:32 AM

Best thing would be to find someone local to you that can test your dme in their car or have someone test it for you.

I would offer, but I have a late car so I can't.

spyder918 · 09-09-2008, 07:44 AM

What is the best way to locate someone local with an early model 944???

If its not the problem does anyone have any other suggestions?

944 Ecology · 09-09-2008, 08:29 AM

You can send the DME to me and I will test it for you, only cost is the shipping back to you.

Let me know if I can help.

gb

bud9344 · bud9344's Garage

I don't think is the DME . It will not start at all if it is Bad. Sound like you have Ignition switch (electrical ) problem.
With the key in run position ! Do you have all power like gauges move/radio/headlight/fan ect.
You could also check the coil is there power to it, also fuel pump should be running
Parking light is on without the key.
I have done that get a rebuild DME and it was not the problem (Just wasted $500.00)
Good Luck

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Bud

87 930 Black
86 951 Black
87 944 S White
83 944 N/A Black
83 944 N/A Whitre Auto

Lapponia · 09-09-2008, 10:38 AM

Bud 9344. Excellent pinpointing down the problem as I see it. It´s important to see what is working or not but this demands wire drawings to follow all cirquits involved. Clarke's garage is very helpful here. It MUST be the DME-relay to blame.
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Lapponia 944 na 1984