Originally Posted by firemedicjth
After searching the threads, I found one that was close but not quite my deal. At random times (it's happened after starting the motor hot or cold) the oil pressure will fail to come up until I throttle up a little. It will come up from 0 after about 20 or 30 seconds and run fine. It runs fine, oil changed regularly by me. Using a 10w oil.
The other day i noticed that the pressure went to the low end (20ish) and then my temp started rising slowly until finally it pegged. I cranked up the heat (on a 75 degree day) and I had to get out of traffic and the pressure came back up, and subsequently, the temp came back down to 210. Your thoughts would be appreciated. Joe
1) It would be more likely that overheating caused the oil temp to rise as well, which makes it thinner, so it flows better, lowering the oil pressure- the opposite wouldnīt really happen- if your oil pump stopped pumping oil, your engine would be destroyed before your cooling system was no longer able to stay cool-
2) Oil pressure is usually 0 for a few seconds after starting the vehicle until the pump builds adequate pressure. If itīs taking way longer, I would first consider changing oil filter brands (could have crappy flowback valves in your current brand, causing the filter to drain after engine shutdown), secondly I would use a cheap mechanical gauge w/ 1/8" NPT fitting connected inline with the sending unit with a 1/8" NPT tee fitting to verify pressure at startup, and if that checked out, I would replace the sending unit ($35 at autozone)