Its Alive!!!

[Lonestar]

I just finished working on the truck today and finally have it running. I am having a couple of problems though. One is my oil pressure will jump right up to 45-50 range, then after running for exactly 30seconds, the gauge will drop to 0. It does this like clock work every time. I have a new oil pump, fresh oil, so I think it is a valve or something that is malfunctioning. Any ideas??



Secondly, when I put my foot down on the pedal, the engine will only rev to about 1600rpms right now. It is acting like it has no fuel, I don't even know where to start here



PLEASE HELP!!



KEEP ON TRUCKIN'

Lonestar

 

[Alan Reagan]

With the oil pressure reading low, the engine is probably going into the "limp home" mode. That's why it won't rev. Have you checked the oil pressure with a manual gauge?



Seems like there is a pressure relief valve in the oil system. I don't have a book on the third gen yet, but I'm sure the second gens had it.

 

[Lonestar]

It could be limp mode, but it does it when the oil pressure is at 45-50 as well. There is an oil pressure relief valve, and it is right above the filter somewhere. I'll check here. Any other ideas anyone?



KEEP ON TRUCKIN'

Lonestar

 

[Badunit]

The 30 seconds could be a timer. The oil pressure gauge is a fake and might jump up to that level automatically at start-up as part of its programming then it drops to its "real" value after 30 seconds. First thing I'd check is that the "gauge" wire is actually connected to the sending unit.



I wouldn't run it without the in-dash oil pressure gauge reading something other than zero or before checking it with a mechanical gauge if the in-dash gauge continues to read zero. Since it apparently isn't making a lot of noise I assume it actually has oil pressure but I'd be on the safe side, nonetheless.



It's probably in "limp-home" mode, as mentioned above. It's likely the ECM sees no oil pressure (even though the fake gauge says 45-50 for the first 30 seconds) and is trying to save your wallet from spewing lots of cash.