1998 GMC Jimmy - Page 3 - Answered Questions & Fixed issues

bad mass air flow sensor , maybe ! have it checked !

There is no cabin air filter for this truck. However, there is an air filter in the black box on the engine intake at the front left part of the engine compartment. Using a Philips screwdriver, remove the four screws holing the cover on - the filter is inside.

Wiring diagrams are not commonly available on the internet - you need a service manual for this truck.

Check to see if fuel is getting to the filter. Maybe too much dirt in lines & plugged filter? If fuel at filter, put hose in place of filter JUST LONG enough to see if fuel is getting to fuel rail.

Theres hundreds of reasons that a vehicle wont start.The Jimmys and blazers are known for bad fuelpumps, you can start there

That engine is not known for head gasket problems. I am guessing but you should take a serious look at the water pump. Are you losing coolant? The water pump is not hard to change on that car but you should have a good set of metric and sae tools to work with. Wrenches sockets extensions etc... Also make sure that there is not any scale rust deposits or scale in the water system. If its not clean metal, the deposits work as insulators and do not allow the water to carry away heat. Buy some CLR (Calcium Lime Rust in the gray bottle at walmart or store) before you change the water pump. Drain all coolant, add CLR and fill with water. Bring up to temp while parked and add water as needed. The heat will cause the stuff to work better and it will disolve all the crap in the system and all the crevices of the system. Run the heater full blast because it will clean out your heater core also. (Ive done this on mine) After running for 45 min to an hour to dissolve all the crap, open the pit cock on the bottom of the rad and let the water from the garden hose flow into the rad from up top while engine is running. You have to flush all the CLR out of the system. Let the water flush the entire system good till nothing but clean water remains in the engine. May take 15 to 30 min to get it all washed out. turn off engine, drain water from pit cock on the bottom of rad.Change your waterpump and make sure all hoses belts and gaskets are new. properly tighten and torque all bolts and tentioners.Check instalation and prepare to add the new coolant. Add your 2 to 3 gallons of 50/50 antifreeze water mix into the system till full. Start engine and top off as air surfaces and level in rad drop due to the air coming out of the block. Let vehicle come up to temperature and make sure system builds pressure with all caps in place. Check for leaks. Only after you have verified its not overheating or displaying any problems should you take it for a test drive. Stick close to home. Use good judgement. Good Luck

have someone crank it over while someone cranks it over to free the pump up

Looks like you are not alone in this. Take a look at this video that may help solve your issues. Good luck DIY How to Replace Heater AC Blower Motor on Chevy Blazer GMC Jimmy S10...

Did you look underneath for leaks ,check the dipstick? Sounds like you are completely out of transmission fluid which does not sound good . Adding SeaFoam probably didn't help either if it was already low or leaking ,never trust those supposed bottled leak sealers ! Hopefully you didn't drive it too far ,if you haven't I would have it towed home and fill it up with tranny fluid a quart at a time ,check it after the second bottle on the dipstick and after every one after until you see any improvement (all the while looking for leaks underneath !! ) Hopefully you haven't burned up your transmission.

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Way too many causes for this - you probably have at least one defective sensor and you need to have the trouble codes checked at a service shop.

Wash it out with hot water or melt it with some windshield washer fuild.

ABS computer is receiving erroneous signals into the ABS computer. Wiring loom connections need checking. Disconnect, reconnect wiring looms around engine compartment dealing with abs equipment. Spray contact with contact cleaner.

Check both hoses coming from firewall. Both should be hot while engine is up to temp. If one is cold, your heater core is clogged. Unhook both hoses from engine, hook garden hose to one hose and blow out the gunk in the core until water turns clear.

The trans cooler is in one of the radiator tanks.All automatics have this.Some vehicles with the bigger motors and transmissions will also have a separate cooler.Some people will install a separate cooler in there vehicles when they do a lot of hauling or trailering.Hope this helps.Good luck.

Fuel pump, same thing happened on my 98 Jimmy.

is there a possible a fuel pump relay causing trouble

Have you adjusted the clearance .

With only that information, I'd first look at or replace the fuel filter.

If you have an automatic trans, sounds like it is slipping, Try changing the trans filter and fluid, but your trans may have to be rebuilt. Only other thing could be brakes dragging/stuck.