Question about 1991 GMC K2500

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Oil presser is going up and down in my gmc 1500 4x4 it has a 350 tbi

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That is a good thing. The pressure goes up as the engine speeds up

Posted on Jan 30, 2009

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My K 1500 has heavy mileage. Engine 5.7 Litter TBI. The oil pressure is very low.


you can do it but when the engine is wore out it will not do you any good .when the oil gets hot the pressure will go away . did it in my 91 gmc and it still needs engine replaced .

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Check gage, oil pressure indicator is down to 0


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How many qts oil does it take?


For 1991 GMC Truck S15 4WD 4.3L TBI 6cyl...

Engine Oil Type/Weight/Capacity

3539
Application:
Oil for use in temperatures above 39 degrees
Note :
Pennzoil Premium Motor Oil HD30

Application:
Oil for use in temperatures above 39 degrees
Note :
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VALHD30
Application:
Oil for use in temperatures above 39 degrees
Note :
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Hope helps (remember rated this).

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have you checked the coolant temp sensor? it controls air-fuel mixture.

Jul 16, 2009 | 1989 GMC K2500

1 Answer

Oil presser


The oil pressure should go down after the engine heats up because of its viscosity. When you accelerate the pressure should go up and at idlen the pressure goes down. 20-40 psi range is normal.

Jan 15, 2009 | 1991 GMC K2500

4 Answers

1991 GMC TBI 350 sierra stalls bad


Could be the TPI Sensor or it might be a touch out of timing.

May 30, 2008 | 1991 GMC K2500

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