Why does my S15’s check engine light come on when I start it?

Generally, your check engine light turning on upon ignition is not a bad thing. This is just your S15 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 S15 making engine noise?

Unusual noises can signal a problem with your GMC S15 engine. Knocking or tapping could be a symptom of low oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can indicate 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 S15 engine?

Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, revving the engine while still in Park, or slamming the gas pedal while the engine is still cold. Protect your engine’s performance and efficiency by distancing yourself from these habits.

Can I use water in my GMC S15 radiator?

It’s not recommended you put water in your S15 radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.

What can cause a S15 engine to suddenly stop?

There are different reasons your S15 vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.

Who repairs GMC S15 engines?

Your local Firestone Complete Auto Care has you covered with expert S15 engine repair. Schedule an appointment today and see us at one of our thousands of locations.

1990 GMC S15 Engine Repair

Learn about

1990 GMC S15 Trim Options

Select your GMC S15 trim level to learn more about GMC-recommended engine repair. Even GMC S15 parts will get older and change.

L4/2.5L

V6/2.8L

V6/4.3L

Repairs for Your 1990 GMC S15

Nothing stays the same forever. Even your GMC S15’s engine parts and components will change. We’re here to help when something stops working. Select a repair or category to learn more about 1990 GMC S15 services.

We Care for GMC S15 Engines

The GMC S15 is respected for its reliability. You may have even been thinking about that when you bought it. However, even your trustworthy engine is subject to wear and tear. Things can go wrong on the road. When they do, you might find yourself searching for 1990 GMC S15 engine repair or replacement parts. That’s where Firestone Complete Auto Care comes in. We've serviced more than 500 million vehicles since 1926, and our technicians know GMC S15 engines. Schedule an appointment if you're experiencing problems that could require engine repair. Firestone Complete Auto Care is a top choice for professional engine diagnosis, service, and repair at an affordable price.

My 1990 GMC S15 Check Engine Light Is On

As soon as your S15 check engine light turns on, it’s time to get an expert’s opinion. A check engine light that’s on or flashing could be a symptom of a serious problem in your or emission system that won't go away on its own. Potential causes may include a faulty oxygen sensor, damaged spark plug, issues with your catalytic converter, or an engine vacuum leak, but that's only a few of the possible causes. Stop by your local Firestone Complete Auto Care to get your S15 issues diagnosed and our expert techs will get the root of the problem. Other signs your GMC S15 engine needs some TLC are oil leaks, or engine misfiring.

GMC S15 Engine Repair

When your GMC S15 engine needs repairs, our expert techs will let you know what needs to be done and why before they get started. We make recommendations, but you make the final decision. If a repair isn’t urgent right now, we’ll let you know. But if immediate repairs are necessary for your safety, we’ll make sure that's clear, 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 1990 S15 engine repairs and you can feel good knowing that we only use GMC-compliant replacement parts such as the serpentine belt, valve guide seal, sensors, or another part.

Questions About 1990 GMC S15 Engines

Why does my S15’s check engine light come on when I start it? Generally, your check engine light turning on upon ignition is not a bad thing. This is just your S15 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 S15 making engine noise? Unusual noises can signal a problem with your GMC S15 engine. Knocking or tapping could be a symptom of low oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can indicate 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 S15 engine? Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, revving the engine while still in Park, or slamming the gas pedal while the engine is still cold. Protect your engine’s performance and efficiency by distancing yourself from these habits.
Can I use water in my GMC S15 radiator? It’s not recommended you put water in your S15 radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.
What can cause a S15 engine to suddenly stop? There are different reasons your S15 vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.
Who repairs GMC S15 engines? Your local Firestone Complete Auto Care has you covered with expert S15 engine repair. Schedule an appointment today and see us at one of our thousands of locations.