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Join Date: Aug 2004
Location: Mckinney TX
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no oil pressure

During the process of trying to fix my cooling fans, i turned on the car, the oil light was on and the gage didn't move. When i first got the car the pressure gage was always on 5. I read that this could mean a bad sending unit. This same problem happened a few months ago, i didn't have any oil pressure. I cleaned the connections on the oil pressure sending unit and it was fixed. When i saw the light come on this time i checked the connections and let the car run for a little thinking the pressure would eventually read because sometimes it takes a few seconds for the oil light to go off. The light stayed on so i shut off the car and tried again later, the light still stayed on.

Is this a bad sending unit, how do i tell? or should i be worried about bigger problems? How long would a car run with no pressure before something bad happens?

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83 944
Old 05-27-2005, 12:57 PM
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Did you check the condition of the wires leading to the sending unit themselves? One could be toast. Any other noises when this happened?

Regardless, do a checklist of things to check before you EVER run it again.................
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1987 944S
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Old 05-27-2005, 02:02 PM
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The car seemed to be running fine. It may of been clicking a little more than usual or I may of just been spooked by the low pressure reading. Is there a way to test the sending unit?
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Old 05-28-2005, 02:01 PM
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Hmm. The only way I know of would be to swap out/change the sending unit altogether. They go for about $40, but a few people on this board have done this and it fixed everything. I'd give it a try.
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Johnny
1987 944S
1984 944 (R.I.P.)
1972 Triumph TR6 - 100% trouble free between breakdowns
2003 BMW 325xi
Old 05-28-2005, 02:20 PM
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you can install a mechanical gauge in plae of the sending unit and that would tell you if your getting the correct reading. more than likely you do have pressure since your not getting a sound of a box of rocks.
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83 944....bye bye
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Old 05-28-2005, 03:03 PM
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well i primed the oil pump and had pressure. but when i was checking the oil level the oil on the dipstick looked milky. could this be from the new oil i primed the oil pump with mixing with the old oil, or something else?
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Old 05-31-2005, 10:05 AM
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Oil\coolant mixing up.

Check your coolant tank and see if you have a milkshake in there.

AFJuvat
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Old 05-31-2005, 05:22 PM
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Sounds like cooler seal time!
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'83 944 "Guards Red"
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Old 06-01-2005, 06:13 AM
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I could see a little oil in the coolant tank. But now the oil pressure is not coming up when i start it, again. I'm going to try to prime the oil pump again since that fixed it last time but I'm still not sure about that gauge. could this be a sign of a bad pump if it keeps loosing its prime?
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Old 06-01-2005, 01:06 PM
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Sounds like oil cooler / oil pressure regulator problems. You shouldn't have oil in the coolent. Or coolent in the oil. The one place these tend to mix is in the oil cooler galley because of blown seals. Also the 83's oil pressure regulator tends to stick. Needs to be replaced with a newer unit.

Don't drive it or run it for any length of time with no oil pressure. You will be rebuilding it!
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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?
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Old 06-01-2005, 02:57 PM
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Oil pressure regulator?

I cant seem to find that part. do you mean the relief valve?
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Old 06-01-2005, 04:52 PM
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Yeap. Had fuel pressure on my mind from another thread.
The 83 has a threaded plug, spring and piston very similar to the early VW's. The piston gets gummed up or debrie stuck in it. Best to get the replacement assembly that has everything in a brass barrel. A bit pricy.

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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 06-01-2005, 05:45 PM
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