Question about 1983 Porsche 944

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I have a 1983 Porsche 944 that I just purchased. It had a bad miss when I got it. I have replaced the coil, plugs, plug wires, dist cap etc. I have now found that if I unplug the cam shaft sensor, it will run smooth and not miss at all. What is going on here?

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Hi rough running or not firing on all cylinders try tapping the injectors with a spanner a i had the same problem and it was asticky injector put inj cleaner inn fuel tank for nxt 3 fill ups no more problems

Posted on Feb 03, 2012

  • esheaton Feb 03, 2012

    hi rough running or not firing on all cylinders try tapping the injectors with a spanner a i had the same problem and it was asticky injector put inj cleaner inn fuel tank for nxt 3 fill ups no more problems

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Posted on Jan 02, 2017

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SOURCE: No spark from the coil,

Your either not going to believe this or hate me for it. Your ECM has a "cold start" circuit with a special set of commands to start the car when cold. It might have lost the command to fire the coil.

Posted on Jul 02, 2011

  • 4336 Answers

SOURCE: 1983 Porsche 944 coil goes bad, just replace coil

What do you mean by bad? Does it measure a different resistance.

Here is the thing on coils, I do not understand why they are not made differently, but

coils are to be run at a lower voltage, often. some like older cars, no more than 8 volts....Think about it...That is a LOT of resistance to scrub down to 8 volts, hello? the system is 13.8 to 14.9 volts NORMAL.....

But I digress.

These resistors fail and the amount that they should do, they cannot do.
One thing that I do as a diagnostic test is to buy a coil, any coil with an INTERNAL resistor. So, I can put full sysytem voltage to it....If it lasts, investigate the viotage available at the coil.

Doc

Posted on Sep 13, 2009

  • 55 Answers

SOURCE: water pump on a 1983 944 porsche

well the thermostat is located on the radiator, it has a double pronged wire going to it. think it is on right side when you looking from the front. Water pump should be under the covering. bottom left of engine, again looking from front. Water pumps require removing the timing belt. Will be expensive my friend if you dont know how to do it yourself. The belt must be tensioned perfect to prevent from head damage. be careful.

Posted on Oct 01, 2009

csmock132
  • 4669 Answers

SOURCE: 1983 porsche 944 will not start when you turn it

Sounds like you need a new cap and rotor.

Posted on Apr 11, 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..................

Porsche 924 944 968 Technical Forum Pelican Parts Technical BBS

Jan 24, 2016 | Porsche Cars & Trucks

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83 porsche 944 wont start replaced coil pulse sensor fuel pump relay...get power to coil but not from coil


Did yo check where it comes out of the coil or the other end of the wire that comes from the coil wire could be bad if you have an ohm meter connect it to wire only and see if there is high resistance in the wire

Dec 28, 2012 | 1983 Porsche 944

1 Answer

1983 Porsche 944 coil goes bad, just replace coil


What do you mean by bad? Does it measure a different resistance.

Here is the thing on coils, I do not understand why they are not made differently, but

coils are to be run at a lower voltage, often. some like older cars, no more than 8 volts....Think about it...That is a LOT of resistance to scrub down to 8 volts, hello? the system is 13.8 to 14.9 volts NORMAL.....

But I digress.

These resistors fail and the amount that they should do, they cannot do.
One thing that I do as a diagnostic test is to buy a coil, any coil with an INTERNAL resistor. So, I can put full sysytem voltage to it....If it lasts, investigate the viotage available at the coil.

Doc

Sep 13, 2009 | Porsche 944 Cars & Trucks

1 Answer

944 cuts off after 5 min.


Sounds like fuel relay located in fuse/relay box. This is a common problem on the 944, always good idea to carry a spare.
Todd

Feb 11, 2009 | 1986 Porsche 944

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