Question about 1993 Chevrolet K1500

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Changed intake manifold gaskets, and while doing so, spilled a bit of coolant that was left in the intake in with the oil. Changed the oil before I even started my truck, and since then, I will have oil pressure when truck is cold, but the more the motor warms up, the more the oil pressure drops, eventually right to zero when fully warmed. (Idle/high speed doesn't matter) It turned the truck off when it got to zero once, and idles horribly when pressure is low. Will the sending unit shut truck off on a '93? (I've heard yes and no, too old) I have changed the sending unit, and changed the oil again since then, fixed nothing. Haven't run truck since then, scared of seizing the engine. Could the oil screen just be sludged up? Or maybe the pump has gotten clogged? Or is it bigger issues? Would like to know more before I go replacement crazy. '93 Chevy k1500 350. No issues before then changing gaskets.

Posted by Anonymous on

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The '93 does shut down on low oil pressure. If I were you, I wouldn't take any chances. Go ahead and replace the oil pump. You are going to have to drop the il pan anyway. No use in doing it twice.

Posted on Jan 03, 2011

  • Anonymous Jan 03, 2011

    That's what I was scared of! lol
    Is there anyway to drop the pan without lifting the engine? I can do it, but it would be an inconvenience to me!

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It sounds like oil pressure switch is bad. You said you changed? To clarify, your oil pressure switch is also a safety item that shuts down ignition when oil pressure drops. Try an oil pressure gauge (hand held) to relieve your nerves about engine seizure. Make sure you're not getting to much fuel in engine also, that will dilute oil to a thin viscosity and show low oil press.

Posted on Jan 03, 2011

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  • Anonymous Jan 03, 2011

    Would this alter the colour of the oil in anyway? and yes, I've heard, and also figured, it would shut the engine down when oil pressure dropped, but I've heard both ways saying yes, it would, and no, it wouldn't shut it down because the truck is too old, and wouldn't be equipped with such safety features.

    It runs horribly, and the last day I drove it, after changing sensor (behind distributer on back of block) and oil, it sounded horrible when the pressure dropped. ran horrible as well. at idle, choked to keep 200rpm.

  • Mical Caterina
    Mical Caterina Jan 03, 2011

    Fuel in the oil might change color but would be extreme fuel smell. Double check all your vac connections, a vac leak would also give same syptoms especially from vac orifices that open when hot.

  • Anonymous Jan 03, 2011

    Could a faulty fuel return line from TBI be the culprit? if it can't return to tank it would go into oil, no? Or am I completely off-course here? Why only when it's warm though? Perfect pressure when engine is cold. (I'm in Canada, so yes, cold)

  • Jackie Miles
    Jackie Miles Jan 03, 2011

    I would not worry about fuel in the oil. You're on the right track about the sludge being washed down into the oil pan. You can remove the oil pan by removing the torque converter cover, loosening the motor mounts, and raising the engine about 3 or 4 inches. Be careful not to damage the distributor by raising too high. That should be plenty of clearance to drop the oil pan and remove the oil pump. You will need a "cherry picker" or engine hoist to raise the motor. Good luck, Let me know how it goes and if I can be of any further help.

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Tools: 3/8" ratchet, standard set of extensions for the ratchet, set of Torx sockets and inverted Torx sockets, set of 3/8" sockets, flat head screwdriver, dikes or side cutters.

1: take off the intake manifold clamps by prying where they latch together, don't damage them unless you plan on replacing them (your call, but a tech would reuse them)

2: take off all the Torx bolts for the manifolds, there's 4 pieces to the aluminum manifolds and the ECM and Vacuum reservoir have to come off the rear manifold to get to some of the bolts. NOTE the location of all vacuum lines and coolant lines so you don't forget them later. Also note the position of the ECM on the manifold so you don't have to figure out which way it goes on later, it only plugs in one way but it's a pain if you fumble it up.

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