Very high oil pressure.....

[zerocoolok]

I just had my transmission rebuilt, picked my car up today and when I start my car the needle pegs out on the oil pressure gauge. It does it at idle, doesn't change while driving, just stays maxed out. It didn't do this before I brought it in (it was fine). Is it just the gauge or something more serious?

 

[Stainbox12]

Check the gauge and the sending unit. Also the cable that goes to the sending unit. Its pretty hard to know if the gauge works properly or not, i had the same issue and i bought an aftermarket one. It works great, and it comes with an aftermarket sending unit as well. Take out the oil cap, and see if you see oil spraying, at least a little bit. That would indicate you have pressure at least.

 

[toybreaker]

An easy test for separating out electrical problems from mechanical, would be to turn the key on, and not start the engine.

If it pegs the gauge, follow the wire down to the oil pressure sending unit. It's located down on the oil filter housing. There's two senders there, one for the oil lite, (short/thin, connector perpendicular to top), and the one you're interested in, (short, but bigger around, connector parallel to top). Leaking oil and power steering fluid will soften/deteriorate the wire insulation, and allow the bare wire to touch ground, causing the gauge to read full scale. The two wires come in from the left front harness, up by the radiator, and run down to the oil filter housing. The o.p. gauge wire can be pulled/stretched during a tranny swap by letting the motor tip, and then it can touch metal and give the symptom you describe.

If the gauge doesn't deflect until you start the motor, you may have an issue with the sender.

You can also disconnect the wire at the sender, and hold it off the connection. If the gauge still pegs, you might have an issue with the gauge unit itself, or a dash problem.

Good luck!.

 

[Raph]

check to see if the wire to the sending unit is grounding out .

 

[wvturbo2]

It is probably the wire under the alternator. I wiggled mine around and got it off of metal and mine went back down. Just mess around with it I'd say thats your problem.

 

[turbolndsc61]

Ok. So I had this same problem After I installed my fmic. Thinking one had absolutely nothing to do with the other, I couldnt figure for the life of me what could possibly cause high oil pressure after the install. I found that the wire that goes to the oil snding unit closest to the crank pulley was pinched between the piping and the oil filter housing. This caused the wire to ground out. Thus I would get high readings even at idle. I replaced the section of wire and hmmmm whatta ya know it works just fine. Either way, like wvturbo2 said, I would check those wires leading to the two sending units. As you can see from my example, something that seemingly has nothing to do with the other can cause the same symptom.