My 97 carrera's oil level gauge goes into the red after it has warmed up around 4000 rpm or higher regardless of gear...if pushed hard to 5000 rpm it reads in the red and then returns to a low normal once it is in a higher gear. I was suspecting it may need oil but the dipstick always seems to have some oil on it and is hard to read. I check it when at full operating temp on level ground while running after idling for 30 seconds or so.. The manuel does say to add oil when it is running or with engine off.....tank seems full when off... what am I missing here?
Warm up the car and have it sit on a flat surface, because Porsche uses a dry sum system you can only check it when the motor is running. open the cap and check the dip stick level, just fill it below the max mark.
SOURCE: Porsche 944 S2 inaccurate petrol gauge reading and oil level warning light
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.
SOURCE: What should the temp gauge in my 2005 911 C2S read
they are designed not to fluctuate with engine temp and are kept stable once operating temp is reached. only if the temp exceeds a set mark will the needle rise to indicate overheating,
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SOURCE: 89 C4 911 gauges reading incorrectly?
These cars are funky and this is normal...gauges on all of the earlier cars are for general reference...checking the oil level manually while the car is running and warmed up is the most proper way to do this...generally speaking, your pressure should drop as the car warms up, but still reach 5 bar on full accelleration (928's have the same gauge). The oil level gauge will actually increase as the car warms up...the difference can be dramatic.
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