Why does the check engine light come on when I start my G2500?

Generally, your check engine light turning on upon ignition is not a bad thing. This is just your G2500 testing its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Why is my GMC G2500 making engine noise?

Strange engine sounds can be a sign something’s off in your GMC G2500. Tapping or knocking could mean you need an oil change. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding might be coming from the brakes, not the engine.

What could damage a GMC engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your GMC G2500 engine?

Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.

Can I use water in my GMC G2500 radiator?

Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.

What could cause my G2500 engine to suddenly stop?

If your G2500 car engine suddenly stops, it could be due to overheating, low fuel, a faulty ignition system, sensor problems, electrical system trouble, or mechanical issues.

Who can repair my GMC G2500 engine?

Your local Firestone Complete Auto Care fixes GMC G2500 engines. Book an appointment today! We have thousands of locations across the country.

1986 GMC G2500 Engine Repair

Learn about

1986 GMC G2500 Trim Options

Select your GMC G2500 trim level to learn more about GMC-recommended engine repair. Use the following chart to find information.

V6/4.3L

V8/5.0L

V8/5.7L

V8/6.2L

1986 GMC G2500 Repair

Nothing lasts forever. Even your GMC G2500's many parts and pieces. We’re here to help when something stops working. Click on a repair below to learn more about 1986 GMC G2500 repairs.

We’re Trained to Care for GMC G2500 Engines

GMC G2500 engines are known for their reliability. You probably thought about that when you got it. Even so, pieces and parts can break down over time. Things can go sideways sometimes. When they do, you might find yourself searching for 1986 GMC G2500 engine repair or replacement parts. That’s where Firestone Complete Auto Care comes in. We've serviced millions of vehicles since 1926, and our professional technicians are trained to service GMC G2500 engines. Schedule a courtesy inspection at the first sign of engine trouble. Firestone Complete Auto Care offers both trustworthy and affordable engine repairs.

Illuminated Check Engine Light on 1986 GMC G2500

An illuminated check engine light on your GMC G2500 is one of the first signs it's time to 'brake' for engine service. A steady or flashing check engine light could signal a serious issue with your or emission control system that won’t go away on its own. Potential causes may include a faulty oxygen sensor, worn spark plug, a problem with your catalytic converter, or an engine vacuum leak, to name a few potential sources. Stop by your local Firestone Complete Auto Care to get your G2500 issues diagnosed and we'll determine exactly why your check engine light is on. engine pinging noises, burning smells, or engine misfiring.

GMC G2500 Engine Repair

If your 1986 GMC G2500 needs engine repair, our technicians will make sure you understand what’s going on before they start working on your engine. We never do any work without your sign-off. If a repair isn’t urgent right now, we’ll let you know. If it's necessary for your safety, we'll make sure you understand that, too. We want to give you all the details you need to make an informed decision about your engine repairs. Turn to Firestone Complete Auto Care for your 1986 G2500 engine repairs and you can feel good knowing that we only use GMC-compliant replacement parts such as the serpentine belt, engine oil seal, sensors, or another part.

1986 GMC G2500 Engine Q&A

Why does the check engine light come on when I start my G2500? Generally, your check engine light turning on upon ignition is not a bad thing. This is just your G2500 testing its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Why is my GMC G2500 making engine noise? Strange engine sounds can be a sign something’s off in your GMC G2500. Tapping or knocking could mean you need an oil change. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding might be coming from the brakes, not the engine.
What could damage a GMC engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your GMC G2500 engine? Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.
Can I use water in my GMC G2500 radiator? Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.
What could cause my G2500 engine to suddenly stop? If your G2500 car engine suddenly stops, it could be due to overheating, low fuel, a faulty ignition system, sensor problems, electrical system trouble, or mechanical issues.
Who can repair my GMC G2500 engine? Your local Firestone Complete Auto Care fixes GMC G2500 engines. Book an appointment today! We have thousands of locations across the country.