Porsche 928 The Porsche 928 was made from 1978 to 1995, during which time it was Porsche's most expensive model.

928S 1986 need advice I

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Old 07-15-2010, 11:33 AM
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Default 928S 1986 need advice I

I have own now over 16 years a 1986 928S never had any serious problems. But recently the odometer stop working. brought it to a Porsche Mechanic and after he fixed the Odometer the car would not start not even a sound of starting. They said I have to replace my Ignition computer which I found one on line and had installed and still will not start. Now they tell me it might be my fuel Computer. Everything been checked up to both computers but nothing seems to read out beyond them. Any one out there knows what the problem might be?? My car been sitting for 2 months now at the mechanics garage and still have not started.
 
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Old 07-15-2010, 03:19 PM
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So the engine cranks over, but doesn't start?
 
  #3  
Old 07-15-2010, 04:00 PM
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Does not crank over not even a spark... It has a brand new battery in it as well.
 
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Old 07-15-2010, 05:52 PM
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SO no noises at all when you hit the key? Have they started simple and tried replacing the starter?
 
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Old 07-16-2010, 07:05 AM
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Yes, they have, plus a used Ignition computer that cost me $300. and still no results.. Its kind of like guessing.. They tell me I should get a used Fuel Computer but I already sunk $1000. into it and thats not the labor and storage at this point.
 
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Old 07-16-2010, 09:14 AM
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Have they tried the ignition relays? I don't see how changing the computers will do anything, that shouldn't have anything to do with the engine turning over. Now if you want it to actually fire, then the computers must work properly, but quite honestly, getting the starter to spin is a very basic electrical concept.
 
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Old 07-16-2010, 10:15 AM
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Thanks, I will pass this on.. Only thing they close at 12 noon and open on Mondays. I will get back to you. Its in Florida my home town. and I work presently in Tenn. So, its hard to follow.
 
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Old 07-16-2010, 10:19 AM
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I just got off the phone with the mechanic and he tells me it does crank over but no spark an no gas getting to it. That is why he thinks it might be of been the ignition computer or the fuel computer? Guess i should go out and see if I can find me a used Fuel Computer and if that does not work then who knows?
 
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Old 07-16-2010, 10:50 AM
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Ok, well that completely changes the diagnosis, lol. Have they replaced the crank position sensor? It will kill both spark and fuel.
 
  #10  
Old 07-16-2010, 11:04 AM
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I just got off the phone with them and they said that was the first thing they did replaced he senor with a new one.. Also. said they have over 8 hours in it dinogsis all the lines and wires going into the computers work. but nothing comes out on other side to the engine?? So, last hope still is the fuel computer. The cheapest used one I found for a 982s that matches up my serial numbers on the one in the car is $400. not counting shipping from NC.
 

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