Question about 1990 Porsche 944

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I have a 1990 Porsche 944 S2 convertible. Many times the engine cranks and will not start. I replaced the DME relay twice but the problem still exists. When this occurrs, I slap the fuse box and then the car starts. Is there another relay causing the problem? Also, my heat is always on so I replaced the heater valve but it still stays on. I noticed there is no vacuum to the heater valve and the vacuum supply resevoir vacuum hose is snapped off. Is this my problem and if so, where can I get another reasonably priced vacuum supply resevoir? Rich

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Possibly the signal to the fuel pump. It might be a bad connection where the wires connect to the fuses or the contacts the fuses or relays plug into themselves. Whether the hose is the problem with the starting or not you need to repair it so that the heat will shut off. If there is some way to connect the hose to the broken reservoir or hold it there to verify that the problem goes away first before buying a new reservoir, then I would suggest that.

Posted on Sep 30, 2010

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84 porsche 944 replaced new spark plugs and wires,cap,rotor,coil,emc,DME relay,fuel pump, reference speed sensors, new battery, and still no start. Any suggestions is what to do next?


Not much left unchanged is there and no doubt you have done compression testing on all 4 cylinders as well. (If not you need to). I assume it is cranking over normally with the starter motor but not firing.

I would try one of the Porsche Owners Forums for this as one of the other 944 owners there should be able to help..... Like this one..................

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Cranks over. But wont start.


Pull the injectors and have them tested for electronic continuity and spray pattern as the needle may be rusted up or the coils in the injectors corroded away for the long period of no use. Regardless of what engine you have if you have spark at the correct time --compression --fuel then you must have go in the engine . Continuing to run will depend on the make and design as the other variables come into play.

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1 Answer

Where is the dme relay on a 1985 Porsche 944


DME relay sorry this is a new one on me please explain

Mar 23, 2012 | 1985 Porsche 944

1 Answer

No spark on 84 944 porsche new plugs wires cap rotor ignition coil dme tested good havnt checked dme relay just gonna replace it found many others have same problem and it turns out to be crankshaft sensor...


It is not hard to change. They are usually located on the bottom back of the engine. I have had cars that didn't spark and the crank solved everything. Others, it didn't work. Don't know why, guess it all depends on the computer reading it all. Your ECM controls all the ignition comonents and timing. Have you tried putting in another? Sometimes, if it doesn't read the crank, it will shut down the spark. Some do, some don't. Can't be 100% sure but it has worked before. I usually tell people to go to a junkyard when they have no spark and have been trying to fix it for some time. Get all the parts you need for cheap. A bad cam sensor can cause no spark and the distributor itself.

Feb 10, 2011 | 1984 Porsche 944

1 Answer

86 porsche 944, starts n runs, while driving at higher rpms, car cuts right off, i start it back up n it runs funky, now last time it did it i pulled dme relay, and puty it right back in and the car ran...


I would buy a used one if you can (dme chip). Have you cleaned the fuel injectors? one could be faulty and could be a coincidence about the car working better after taking the relay out and putting back in. could be a bad cpu also. would love to hear what happened if you get it fixed. good luck

Aug 07, 2010 | 1986 Porsche 944

1 Answer

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to me could be a gasket problem if you are blowing smoke when applying gas. just a suggestion. have you checked the oil? to see if milky? keep me informed please. Thanks.

Jul 16, 2010 | 1986 Porsche 944

1 Answer

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check in the truck area where fuel pump relays and wires are.something is loose look at fuel pump relays and fuses see if they all the way in place.

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1 Answer

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