hellotbone

Hey guys my grampa has a 99 with just a diablo chip for performance his prob is his gauge is not register oil pressure sometimes when it starts up for a long time and sometimes when he is driving the light will come on and the pressure will read 0 and the buzzer goes off then the pressure comes up and the light goes off and all is well? He and I checked the fluids and everything seems to be in order is there some sensor that will cause this>?

Shovelhead

The dealer has a TSB that's supposed to cure the problem.......only thing is that is basically renders the oil pressure gauge useless by making it always read approx 40 lbs of pressure.<br>The real fix is to replace the oil pressure sending unit on the side of the block near the lift pump.<br>This is considering the fact that you already know there is no real oil pressure problem brought on by clogged oil filters and such.<br>

hellotbone

so basically if I put a new filter on and it does it then I should change the sensor? Other then that he can get the ******* to make the gauge useless.

Shovelhead

I've seen several postings about the bouncing oil pressure guage. <br>If your're already using a fleetguard or equivilent oil filter, I'd try replacing the pressure sender before I'd let the dealer screw up my truck with a suspect reflash.

PourinDiesel

To replace that Oil pressure sensor, its on the ECM side of the truck, it is brown/tan plastic with a brass front end threaded into the block. It is located on the drivers side near the ECM.<br><br>To change it, unplug it from the wire harness, then unscrew it from the engine block with a 32mm DEEP well socket.<br>Buy a new Sender/sensor from a Cummins Dealer then reinstall torquing to about 8nm (not very tight at all, just contact and about a 1/3 turn)<br><br>--Justin

yomitch

and use teflon tape ;D ;D ;D