Top 20 1989 GMC Sierra - Page 9 Questions & Answers

You could always run a fused wire from the fuse panel to the relay. This way when you turn the key, power goes to the accessory on the fuse panel, the fused wire you installed, and to the relay circumventing the problem and creating a protected circuit.

sounds like the wiring is bad check for cracked or curroded spots

there is a condition,we,as,techs,call,closed loop,and,opened loop,this is the if from cold,and warm,best advise is,it needs to be put on a scanner,to see what sensors are doing

this truck doesnt have a carb, this has a throttle body, its fuel injected,there are no adjustments,every adjustment is done from the factory, the computer controls the idle,trying to raise the idle will throw the tps readings off,

Basically give the vehicle a transmission oil change with a new filter and gasket. Once oil and pan are removed remove old line with appropriate flare wrench. install new one , replace filter gasket and reinstall pan. Refill with ATF.

Drain the coolant (left lower side of the radiator) Follow the upper radiator hose to the engine, at the end of the hose is a metal housing, held down with 2 bolts, or 1 bolt and 1 stud. There may be wires going to one of the bolts, be sure these go back on. After taking the 2 bolts out, lift up the housing and the thermostat will be right there. Clean the old gasket from the manifold and the water outlet housing. Now install the thermostat, then the gasket. and torque down the bolts evenly. about 25-30 ft pounds. fill the radiator until about 2 inches below the filler neck, and start the engine, now keep putting coolant in to keep it 2 inches below the radiator neck, and let it warm up until you see coolant moving in the radiator, now fill it to the top and fill the coolant bottle to the cold mark. Its a good time to replace the radiator cap also. Good Luck.

Yes,but there is a o ring type seal in it that needs to be replaced also.

actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

most likely you'll see the bulb socket protruding in the back of the headlight, gently grab it and turn slightly to left or right, there three tabs on the base that line up w/ 3 holes and the light assembly will slip out....don't be afraid to discuss this with the guys or gals at the autoparts house- they love to give out advice.....hope i've helped in some manner...pappy

ok there is a few things might be happening...first did you make sure when you put the intake gaskets in there was No ports plugged or covered...second is...are both heater hoses Cold or is one hot and other cold...if so you have a air lock in the heater core...if this is the problem you need to lossen off the cold one till antifrezze comes out.

The ignition switch could be the culprit. It's located on the lower half of the column, on top of it. Remove the plug, the two screws that hold it on, and lift it off the actuator rod that runs up to the key cylinder. It's about $30.00 new and takes about 10 minutes.

Or you could bypass the problem.

HI. This issue has many causes. i will list the most common causes below.

Coolant consumption::: Possible causes______


1. Check the head gaskets. The gasket may be leaking.
2. Check The Intake Manifold Gasket. This gasket may be leaking, worn, or damaged
3. Check the cylinder head for worn or scorn cylinder block.(This will require total breakdown of the engine)

4. Check the water pump seal for leaks as well.

Now that we have covered the basic check points for coolant consumption, i would advise to concentrate on the head gaskets if there are no apparent leaks on or around the engine itself. If the head gaskets are worn, the leak can be introduced to the engine internally, causing the engine to burn off the coolant. this is noticeable by removing the oil cap, after a hard drive. you Will notice steam that will escape the head as soon as you remove the cap. If this is the case, your problem will be with a failed head gasket.

IN a severe case, you will notice white plums of smoke escaping from the tail pipe during acceleration.

firing order for 5l is 1-8-4-3-6-5-7-2
timing is 0 deg btc at idle speed

If all your other gauges work, more than likely you have a bad sending unit in the gas tank or bad ground to the sending unit.

look for a vacuum leak. A large vacuum leak will do just what you described. I would listen for a leak first if you cant hear it and locate it then i would spray carb cleaner around the vacuum lines. If you have a leak it will pull the carb cleaner in and you will hear the engine rpm change.

check regulator

sounds like sum1 had the steering wheel off. u need 2 put the spring and c clip back on rite on the steering shaft. its hard 2 do. may need 2 ppl and 2 screwdrivers 2 doit. i can 2 it by myself but its hard

Replace injection pump, or test it. The injectors could be bad.

this truck came with both the 4 speed 700R4 and the 4L60/MD8 which is a variant of the 4L60E

drop the tailgate and look at the corner of the light. Should be 2 screws that hold the tail light in.l