20 Most Recent 1998 GMC Suburban Questions & Answers

I really hope that when you were doing this job that you relieve pressure from your cooling system you have trapped air in there that needs to be released the only way they release that air after that job is electric car run until your fans kick on by themselves then your system has been thoroughly thoroughly Purge of air

any body bothered to read the fault codes to find out the area of the problem has anybody bothered to check for blocked cat converters has the engine coolant temp sensor being checked as it may be still telling the ECM that the engine is cold and the air/fuel mixture is for a cold engine so it is running too rich when hot

Don't worry I'm sure you will get the solution of your problem, just check the link I attached Best Manuals

most likely not a relay but a failed flasher can as the lights are on but not blinking a relay would not have the lights on

This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Normally when the injectors are turned off, the car will run for a second or two, and then stall. Is there a light on the dash that says SECURITY or a picture of a car with a lock through it? This is a common problem worth looking into. http://www.diy-gm-security.com/

spin each pulley individually make sure they are all straight and bearings are good and quite also make sure there is nothing loose that can make contact with the belt if any of the pulleys are loose or noisy or if they don't turn freely they will need to be replaced

Check the rear ground connection for corrosion or a loose crimp connection.

Possibly from the windshield. Is there any rust around the windshield area? Check for debris in water drain outlets under the wiper arm cowling.

check the switch on the brake pedal.

Sounds like either a bad transmission pump or torque converter. Have the vehicle evaluated by a transmission shop.

Here u go, good luck. https://www.youtube.com/watch?v=UfsFGfNcPY0

After it starts does it idle good before you step on the gas , will it keep idling before you step on the gas ? Is the check engine light on ? What engine does the vehicle have ? This vehicle came with 5.0 L ,5.7L ,6.5 L , 7.4 L engines ,gas or diesel ? Three specific data sensors provide the vehicle control module (VCM) with the basic information for the fuel management portion of its operation. Three specific signals to the VCM establish the engine speed and air density factors. The engine speed signal comes from the distributor high resolution circuit. The VCM uses this information to determine engine speed (RPM). Air density is derived from intake air temperature (IAT) and manifold absolute pressure (MAP) sensor inputs. The IAT sensor measures the air temperature that is entering the engine. The IAT signal works in conjunction with the MAP sensor to determine air density. As the intake manifold pressure increases, the air density in the intake manifold also increases and additional fuel is required. This information from the IAT and MAP sensors is used by the VCM to control injector pulse width. One of these sensors could be bad or a plugged catalytic converter .

It depends, if you have sealed beam headlamps, there should be a frame around headlamp, remove it. If composite headlamps, there are two hex headed pins in top radiator support, remove those pins. Take out lamp assembly so you can get at bulbs.Don't touch new bulbs with bare hands.

The switch is bolted to the left side of the steering column under the dash. Make sure you have good lighting look under and pull the leaver as you would to turn high beams on. The switch is connected by a metal rod that runs up the steering column. You'll see it moving. Use the proper tool to remove the two bolts that bolt the swith to the column. Unplug the wire harness and angle the switch and it will release from the metal rod. Do not bend the rod! Be safe don't do this with your legs sticking out into traffic. Reverse the steps to reinstall. Good luck

You need to check for power and ground at the headlamps I have ran into situations where you think their is a problem with headlamps when just both bulbs have burned out

I had this issue as well. My headlights did work but the high beams didn't. I replaced the high low beam switch under the dash bolted to the steering column. Go to rockauto.com and it'll be under your vehicle under electrical switches. The switch heats up and gets stuck in high or low. Common problem. Good luck!

the backfires occurs in airfilter assembly as it was remain opened from somewhere fix it properly

The selector drive mtor mounted on the transfer case had alot of problems with water getting into the circuit board and also the mtoro drive getting stuck. At the dealership I have replaced hundreds of these over the years.