20 Most Recent 1991 GMC S-15 Jimmy Questions & Answers

Sounds like it's worn out, best take into the shop for repair, should only cost $20 with parts.

Thye fuelpump relay is located to the right of the brake booster. this is for a 1991 gmc jimmy (s-15)I have enclosed a diagram to help locate the relay.The most common reason for no fuel pressure on these trucks is not the relay but rather the fuelpump itself. the pump is located inside the fuel tank.There is also a problem with the wiring to the fuel pump, you will need to locate the top of the tank and then off to side of tank is wiring . This wiring comes off the top of the tank, you will need to check and there is connector problems.. there is one or two ground wires that come off wiring to top of tank which run to frame, check to make sure the grounds are good. if you end up with a bad pump you will see a notice to rewire a new fuelpump connector. hope this is helpful. good day.

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is there any spark to spark plugs?
check the fuses first
it could be the ignition module

Hi my name is Brandon I am mechanical n electrical engineering technician and 4 generation mechanic its a blessing by God! But tell you little bout what I do I am not a mechanic I am the man they call when reg... mechanics cant fix it and I need more information to be right on the money Sounds like natural safe switch on transmission

Brandon,
Mechanical n electrical engineering technician
Email address is ([email protected])
I will get back to you asap soon I can
Thanks God bless you

A full rotation and balance couldn't hurt. Possible brake issue too...

It sounds like an air lock or a fuel pump issue. firstly get the filter changed and bled through this might help. if the problem persists check the pump.

Regards

Dan

its fuel injected try some injector cleaner lucas worked real good for me

change throtle sensor

change brakelight switch

check brakelight switch

I don't know what the manufacturers recommendation is, and probably at that high of a mileage (CONGRATS!!) they won't have one. Based on personal experience, I would say YES... the oil you have chosen to me is probably the best selection you could make... the "10W" means that at 0 degrees F in winter conditions it acts as straight #10 oil would, and the "40" indicates the weight it would act as above 70F.... you want the thinner oil viscosity in cold weather (which is still pretty thick because of the temperature) and the thicker in the warm weather due to the wear on your engine.... plus, the formulation for "high mileage" oils is specifically designed for high mileage engines with a proprietary blend of detergents and additives.

On the side of the transmission where the shifter cable is for an auto

sounds like the fuel pump is bad. check the fuel pressure with a gage is should be 35lbs. if it still won`t start now have someone try to start it while you hit the fuel tank bottom with something if it starts the pump is no good.

You cannot get an answer here. You need to get professional help.

Have the EGR valve checked out.