Question about 1990 Porsche 944

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Porsche 944 S2 inaccurate petrol gauge reading and oil level warning light

Hi,
When I fill up the tank to full (80 litre), the petrol level needle only shows
the tank being 3/4 full. I have checked the connectors on the petrol tank
itself and they seem to be fine.
The other problem is sometimes when I turn on the car ignition, I get the red
! warning light - oelstand (check oil level). This light does not go out, but if
I turn off the ignition and turn on again the light goes out. The petrol level
and the check oil level are on the same gauge. Problem being the car does
not need filling up with oil, oil level is fine.
Thanks in advance.
Warren

Posted by on

  • imflash3 Mar 20, 2009

    I have the same problem, does not go completely to full, I have changed out the fuel sending unit and still have the same problem...

  • GBOSHES27 May 08, 2009

    WHEN LEFT OVER NIGHT IT READS ACCURATELY, AFTER RUNNING FOR TEN OR SO MINUTES IT READS 3/4 FUEL AND DOESNOT MOVE, ADDITIONAL IT NEVER READS ABOVE 3/4


    GB

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This is not a known solution, but in general these cars suffer from voltage and current drops on electrical connections due to corrosion on contact surfaces. I cannot remember the number of times I have read about electrical problems on these cars, and the problem was usually solved by cleaning the electrical contacts or replacing a relay going bad (BTW, this car does use a lot of relays however I doubt there is one in the fuel gauge circuit).

Also, I have a spare gauge cluster for the 944 and when I look at it, there are some resistors on the "printed circuit" piece. If one of those were to lose tolerance, or burn open, it would no doubt have an effect on the accuracy of the circuit. I would check out that circuitry and test the resistor values as a last resort -- it is not likely the gauge itself if it is working at all. However, before doing that I would clean the electrical contacts thoroughly. I have not tried to gain access to the wiring harnesses for the gauge cluster while it is in the car, but I doubt it is possible. So, if you have exhausted all other ideas go to the Clark's Garage site for instructions on how to remove the dash, and just follow the portion that applies to removing the gauge cluster. Go to the local electronics hobbyist store, or online, and obtain a good contact cleaner and clean all of the electrical contacts while also looking for loose or broken wires. NOTE: Be careful and gentle dealing with the plastic connectors on these cars as they tend to be brittle and little tabs break off easily if man-handled. Go slow, be in the right frame of mind and use good lighting so that you can see what you are doing.

Posted on Mar 29, 2009

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