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Re: how do you tell if the sending unit is bad or bad oil pump
Loosen the oil filter and see if anything comes out with the engine idling.
__________________ 2001 SS M6 Arctic White
431 rwhp @ 6400 rpm, 398 rwtq
3083 lb. race weight, TSP 235/240
Rolling on 13" Goodyear slicks all 4 corners
150 mph Club Member Bonneville Salt Flats LSR 2002 Duramax Tow Vehicle
2001 Corvette M6 White
Re: how do you tell if the sending unit is bad or bad oil pump
Weird, the guage works like a minute after the car is running now. It reads zero then works normal after a minute or so of driving. I guess this has to be the sending unit.
Re: how do you tell if the sending unit is bad or bad oil pump
You had better not take chances. Pull the oil filter and make sure you have consistent pressure. Otherwise , you will be pulling more than the filter!!
Re: how do you tell if the sending unit is bad or bad oil pump
If it turns out you need (or want) a new sending unit, I think I have a new one in my basement from when my oil pump failed. I would let it go for cheap.
__________________ 04 GTO
Magnuson, Kooks, CAI and tuning.
11.83 @116
Re: how do you tell if the sending unit is bad or bad oil pump
where is the sending unit located at. If its easy to change I'll do that and see what happens. I would have to bring the car to the dealer to get it and oil pump replaced if its hard or doesn't fix it.
Re: how do you tell if the sending unit is bad or bad oil pump
sending unit is right behind the intake manifold. You need to pop off the intake manifold and then it's right there...
One problem I had when I changed mine (broke mine during my intake removal so had to replace) is that I didn't have a socket deep enough for the new sensor... so I ended up pulling my lifter valley cover and using a big wrench
__________________ Mike Horist
00 WS6 (TA) | 04 WS6 (GTP Comp G)
Mike \\#at&\\ horist \\&dot$\\com
Re: how do you tell if the sending unit is bad or bad oil pump
your pump is probably going bad, mine did the same thing it would sit at zero, and after i threw a rev it would work fine, but after that everytime i accelerated the pressure dropped to zero lol. I heard someone mention that was due to the pressure release sticking or something of that nature.
__________________ 99 SS9.9x@142.x M6 - New setup Solid roller 422 with a F2 in the works. 06 Z069.83@153.7 M6 - H/C/I/YSi
Re: how do you tell if the sending unit is bad or bad oil pump
At higher rpm's the pump produces too much pressure, so the the relief valve opens. When the rpm goes back down, the valve is supposed to close, but sometimes the plunger hangs up in the bore so when the engine returns to idle there's no oil presure. The ported replacement pumps have this bore opened up slightly so it doesn't hang up. Don't ask me why GM didn't do this . . .
__________________ 2001 SS M6 Arctic White
431 rwhp @ 6400 rpm, 398 rwtq
3083 lb. race weight, TSP 235/240
Rolling on 13" Goodyear slicks all 4 corners
150 mph Club Member Bonneville Salt Flats LSR 2002 Duramax Tow Vehicle
2001 Corvette M6 White
how do you tell if the sending unit is bad or bad oil pump 
