20 Most Recent 1989 GMC Sierra - Page 5 Questions & Answers

pull switch and test more than likely switch went bad

I had a similar problem with mine. Turned out to be a bad ground connection in the tail ight assembly. There are steel tabs that spring out and contact the steel stamped out frame in the plastic around the bulb sockets. They were making a bad or no connection and were rusted. Bad design :( Anyway I used a very small wire wheel and removed the corrosion and soldered the connections. No more problems!

The check engine light means something has happened to the performance of the engine to affect emissions. You need to get the computer scanned for trouble codes to proceed.You can research "GM check engine light" online to get the steps to check it yourself.

If it is a V8 engine with throttle body injectors the regulator is next to the injectors on top of the body.

Web sites that have the seats you are looking for would be www.newgmparts.com/GMC-Parts or www.gmpartsclub.com/You could also try your hand on ebay, but your not gauranteed top quality.

6 or 8 cyl ? Were you driving down the road when it happened ?Usually the ignition module is inside the dist and that fires the coil. The coil is either in the cap or mounted on the intake manifold.If the truck has over 100,000 miles the timing chain could be off. A timing light would tell you.

Clogged Gas FilterWorn out & Blocked Exhaust ConverterBad Ground at Fuel PumpThe different gas gauge readings would indicate a groundissue with the sending unit in the fuel tank & possibly thefuel pump shares the same ground or it is worn out.I would check fuel pressure with a gauge & the fuel may bethere, but not enough volumeA fuel pump can last 4 years or 18 years

The front park lights work correct? If the front park lights work than there is not a problem with the light switch since the brown wire from the switch supplies power to the front park lights, front side markers, and the rear taillights. There should be twelve volts on the brown wire from the headlight switch with the connector plugged in and the park lights turned on. If this is true that there is a problem with the wiring to the back of the vehicle. A thorough inspection of the harness should reveal the problem. The dim break and blinkers support the above. High resistance also know as corrosion, in the wires or connections would cause this problem. I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The speedometer operates off from the speed sensor. The speed sensor is also used by the cruise control to maintaned the proper speed. If bothe are not working than there is likely a common problem. I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

If you line up the timing marks on the crank pulley, you have a 50/50 chance of the number one cylinder being at top dead center. If it is, the rotor points to the number one plug wire.

you need to check the grips of the AC and other things . make them tight.. n check fuses. not a big problem.