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 .

Nov 01, 2015 | Chevrolet Cars & Trucks

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GMC Yukon cranks over but will not start. It did act up for awhile, sometimes suddenly wanting to shut down, then it would run fine for awhile. Now this morning it simply will not start.

check to be sure you have fire to the plugs and also check to be sure you have fuel to the engine. Not sure what year you are working on but if you have fire and fuel to the injectors or tbi unit then check to be sure cat converter or muffler is not plugged putting back pressure on engine. If you put fuel in the tbi unit and it starts better go to the fuel pump.

May 03, 2015 | GMC Cars & Trucks

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How do you put a gmc jimmy s15 2.5 1987 troddle body in after it's took out i need to know were the o rings go and the filters

Looking down at the tbi there are 2 screws holding the injectors in place, remove them then remove injector ,a oring goes around each injector

Dec 02, 2014 | GMC Cars & Trucks

2 Answers

Check gage, oil pressure indicator is down to 0

A very common problem is for the actually tiny stepper motor on the back of the guage itself to go out. Common to go out on 1 or more guages. Good thing is, very cheap off of e-bay and easy to install.

Jun 24, 2011 | 2002 GMC Envoy

2 Answers

How many qts oil does it take?

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

Engine Oil Type/Weight/Capacity

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

Oil for use in temperatures above 39 degrees
Note :
4 Quarts without filter change

Oil for use in temperatures above 39 degrees
Note :
Valvoline Premium Conventional 30 Motor Oil

Hope helps (remember rated this).

Jun 10, 2010 | 1991 GMC Sonoma

2 Answers

89 GMC K2500 5.7L TBI not spraying fuel

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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