Q: Fixed car after Service Engine Soon light came on. It's still not working right

asked by on January 29, 2016

I have replaced almost everything in my car, and it's still not working right. The Service Engine Soon light came on, and I was told it was random misfiring. I replaced plugs, wires, etc., already

I can understand how frustrating it can be to replace parts on your car only to have it continue to experience problems. There can be several reasons why your Pontiac has its’ Service Engine Soon Light illuminated. If there is a misfire present after performing a basic tune-up, which includes replacing the spark plugs and ignition wires, then next we need to determine what else could be causing your Pontiac’s problems. I would first start with reading the computer on the vehicle. This is best step towards verifying which codes may be causing the SES light come on. From my experience, it is also possible that your Grand Prix may be having fuel issues, perhaps due to a lack of fuel pressure or a problem with one or more of the fuel injectors. Another common possibility is that the misfire is being caused by internal engine damage, such as a bent valve. With a sensitive issue like this, I find it best to enlist the assistance of a certified mechanic to come out and determine the fixes for your car’s Service Engine Soon Light.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

No reverse, car drives in neutral and drive

You may have a shifter cable problem with the cable ends. The plastic cable end bushing deteriorate and fall apart causing this problem and may require the shift cable to be replaced. Check cable end where it connects to transmission...

Car cranks over but wont start. Looking for some answers maybe...

There are several possible causes for a vehicle to crank and not start. There could be a bad fuel pump, faulty plugs, bad timing belt/chain, faulty ignition, failed camshaft/crankshaft sensor, or any number of other possible causes. It would first...

Possible carbon monoxide leak in the car?

You will need to have the exhaust system checked at an exhaust shop to see if the exhaust system is also rusted out leaking fumes into the car. If you have floor holes then see a body repair shop to...

Related articles

How to Buy a Classic Pontiac
Whether you want to buy a classic Pontiac for yourself or as a gift, here are some tips on buying one for a great value.
Understanding the Pontiac Oil-Life Monitor and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Pontiac Oil Life Monitor (OLM) indicates when and what service your car needs.
The Best Used Cars to Buy for Occasional Drivers
Not Not everyone relies on their car on a daily basis. Maybe you aren’t the type that deals with a daily commute, and running from here to there constantly. If that’s the case, you may be looking for a car...