Long story short wife lent out her 93 gmc 2500 6.5 to her neice. The truck died on her on her way home, so i went and picked it up. Got there and started it up and the check guage light was on and the oil pressure guage is reading almost nothing. So i towed it home and took the oil line off the turbo and started the truck and oil is pissing out of it pretty good, the motor is running pretty rough at the moment but does run. Im thinking something is wacked but my knowledge of these motors is limited. Any help would be appreciated.

Thanks

if you could fill out this form to the best of your abilitieshttp://www.dieselplace.com/forum/showthread.php?t=42248
it could help us find something that might couse the problem that you are having that might otherwise go unseen.

i would start also by checking for excesive blowby. take a piece of clear tubing and push it over the top of the dipstick tube and put the other end in a glass of water and start the engine. if i remeber corectly and your egr valve is working the water should be sucked up the tube by a half inch or so. (the egr couses a slight vacume to help against oil leaks) if air is comeing out the end of the tubing, than you could have a bad egr or an even bigger problem, is the water in the oil? what about the exhoust, is the a constant flow of a light grey smoke? why i ask is when i had a hole blown in the piston of my truck, it ran a little ruff but ran, had no to little oil preasure, had a light grey smoke coming out the exhost and a ton of blow by. (hope this isn't the case) im not trying to scare you, just trying to get things moving forword for ya :)

Did you check the oil level in the pan? I'm assuming you did. That would be the first thing I look at when low oil pressure is involved.

Jake

Did you check the oil level in the pan? I'm assuming you did. That would be the first thing I look at when low oil pressure is involved.

Jake

i didnt think of that LOL

Did you check the oil level in the pan? I'm assuming you did. That would be the first thing I look at when low oil pressure is involved.

Jake

If your oil level is low, you may want to check for leaks. May be oil cooler line is bad, that is the one that is quite detrimental to our truck.

Also, check if there is coolant in oil? Oil becomes milky.

Also, check if there is coolant in oil? Oil becomes milky.
on a diesel it doesn't become milky, it turns to sludge that can be found in the cdr/cdr tube, i had a gallon of coolant in my oil from a cracked block and you would not know it was coolant, it was black as could be.

sounds like an OPS problem

sounds like an OPS problem

make sence, if the OPS is reading that there is little to no oil pressure, than the check engine and/or check gauges light would come on and the gauge would show little to no oil pressure even though the engine has good oil pressure. if the ops is reading that the is "no oil pressure" than it would shut down the lift pump to shut down the engine to keep it from destroying its self from the lack of oil. the engine will still run even if the lift pump is not running, just not realy well, stalling, sputtering, and hesitation while accelerating are common signs that the lift pump isn't running.

make sence, if the OPS is reading that there is little to no oil pressure, than the check engine and/or check gauges light would come on and the gauge would show little to no oil pressure even though the engine has good oil pressure. if the ops is reading that the is "no oil pressure" than it would shut down the lift pump to shut down the engine to keep it from destroying its self from the lack of oil. the engine will still run even if the lift pump is not running, just not realy well, stalling, sputtering, and hesitation while accelerating are common signs that the lift pump isn't running.

bingo :)

if the ops is reading that the is "no oil pressure" than it would shut down the lift pump to shut down the engine to keep it from destroying its self from the lack of oil. the engine will still run even if the lift pump is not running, just not realy well, stalling, sputtering, and hesitation while accelerating are common signs that the lift pump isn't running.


That is not the purpose of the OPS at all. The purpose of the OPS is not to save your engine if you run out of engine oil. It is to prevent diesel from being pumped onto the ground in the event of an accident to help prevent, or at least not accelerate a fire.

The Powerstroke is the only "light duty" diesel I've seen that would shut down if it ran low on oil, and that's only because the high pressure oil pump would basically run out of oil and without that pump working, the injectors will not fire because it's HEUI injection system.