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Oil pressure dropping off

Itsme7

By Itsme7
in Ask A GM Technician

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Itsme7 Enthusiast

Itsme7

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I definitely was getting ahead of myself. The drop in pressure was just a bad sign to me, since i know oil pressure is vital to the engine, and with the problems ive had in the past with the truck with a blown trans and other stuff going, i was at my witts ends with the truck lol. Today i went to move the truck, start the truck and the pressure gauge moved slowly until 10 psi or so then shot up to 40, then dropped down to 35-30 within a second or 2, so i turned the truck off. Put the key in the ON position, and the gauge was reading 5 psi or so? started the truck and did the same thing as before. Turned the truck off and put it in the on position again, and it was registering 10-15psi with the engine off? pretty sure my gauge or sending unit is shot lol. So im getting a modular pillar with a mechanical oil pressure and coolant temp gauges. Sigh of relief lol.

jro909 Senior Enthusiast

jro909

Posted
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you would know if your oil pressure was way way low....i'm sure the engne would sound like a couple of robots laying pipe in a laundry mat

txab Senior Enthusiast

txab

Posted
Posted

I definitely was getting ahead of myself. The drop in pressure was just a bad sign to me, since i know oil pressure is vital to the engine, and with the problems ive had in the past with the truck with a blown trans and other stuff going, i was at my witts ends with the truck lol. Today i went to move the truck, start the truck and the pressure gauge moved slowly until 10 psi or so then shot up to 40, then dropped down to 35-30 within a second or 2, so i turned the truck off. Put the key in the ON position, and the gauge was reading 5 psi or so? started the truck and did the same thing as before. Turned the truck off and put it in the on position again, and it was registering 10-15psi with the engine off? pretty sure my gauge or sending unit is shot lol. So im getting a modular pillar with a mechanical oil pressure and coolant temp gauges. Sigh of relief lol.

 

 

have you had cluster replaced by GM? '05 was one of the model years that had screwy cluster stepper motors. I'll still put money on sending unit or stepper motor

Itsme7 Enthusiast

Itsme7

Posted
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Nope havent had it replaced, dont really want to mess around with it, would rather install a mechanical gauge and call it done lol. If i install a gauge, wont i have to disconnect the current one which would make the DIC freak out on me for low oil pressure?

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

True. Is there anything i can T into for a oil pressure pickup?

 

 

T into the stock oil pressure sending unit. Get a Y fitting that fits the engine and put the stock sending unit on one side, and the mechanical tube on the other side.

 

If the stock gauge is still reading something with the key in your hand, then the problem is in the dash, not the sending unit.

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