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Join Date: Dec 2004
Location: KC
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no spark problem

Hi list,
I replaced my water pump and belts this weekend, (84' 944), got everything lined up right, filled it up and cranked it...nothing, wouldn't even catch. OK, put on my spark tester to the #1 plug, no spark. Put the spark tester on the dist. cap, nothing. Really depressed at this point, so the next day I tried it again, and it started! Ran like crap, but it ran. Ran it for about 3-5 min, before it low idled and died. Would NOT restart. I tried all day today to get any spark at all, nothing. Since this thing is mototronic, what diagnostic should I go through?
thanks in advance
Old 03-06-2005, 05:30 PM
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I would look at the cable between the dist. and the cap. These can pull loose inside the weather boots. Could be that the rotor is twisting on the shaft. Check to see that the screws are in the shaft to the cam.
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Hugh - So Cal 83 944 Driver Person
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When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Old 03-06-2005, 05:36 PM
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Those things are OK, there's is no spark comming from the coil to the distributor. What are the various things that would cause this?
Old 03-08-2005, 06:38 AM
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No voltage to the coil: bad ignition switch.

Sensors are not connected or set properly.

Bad DME relay. This powers the DME (brain) and the injectors. With the key on check for voltage at the coil and at the injectors.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 03-08-2005, 07:42 AM
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Thanks! This gives me some things to check.
Old 03-08-2005, 11:08 AM
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If you have voltage at both the injectors and coil then take a hard look at the connectors for the sensors; speed and reference. These are hard plastic and crack with age. Sometimes when they crack they also break the wires runing through them. Could just be loose. The reference sensor (rear one) is what triggers the DME. The DME grounds and releases the coil to cause the spark.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 03-08-2005, 02:15 PM
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Phase of the moon problem. Wait a while, the moon will change phases and your car will run just fine again...
Old 03-08-2005, 10:13 PM
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I keep wondering where all that hair comes from.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 03-09-2005, 06:40 AM
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i am having the same problem and i spoke with ian at 944online.com and he was telling me to check the alarm, he also stated that he hasnt sold a coil in 3 years, he said to place jumpers on the alarm (if you have one) then try and start it, the position of the jumpers is from 1-4 and 7-8 and this should bypass the alarm phase of ignition, if you try this if you try this and it works awsome, as for me im afraid my problems a little deeper
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Old 03-25-2005, 01:40 PM
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Simple to check proper operation of the alarm box without briding anything. Check for power at the DME-harness. If the alarm-box is interfereing with powering on the DME-relay, you won't have any power on the DME harness pins #18 & 35 (big red/yellow-stripe wire). So unplug the DME, turn the key to ON and check for +voltage at pins #18/35 (use anything for ground, door-hinge bolt, bolt on side of center-console, battery negative terminal, etc.).
Old 03-25-2005, 04:09 PM
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