Fixed car after Service Engine Soon light came on. It's s...

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

Truck is bouncing

Sounds like you might need to replace your shocks. Shock absorbers do exactly that, they absorb the shock of the road as you drive. They keep the vehicle from bouncing all over the road. When the shock absorbers go bad,...

Clunking noise from front of car when driving slowly or turning slowly

Hi there. Most clunking sounds, especially while turning, are attributed to worn out bearings or bushings - especially CV joints, tie rod ends, and also stabilizer bar joints. Not sure why it would only happen while it is hot outside,...

Starter not turning

Hi there. If you hear a click, then the first thing I typically do is find where that click is coming from. Most of the time, the clock is the starter trying to engage but it is unable to crank...

Related articles

Pontiac Certified Pre-Owned (CPO) Car Program
If If you’re in the market for a used Pontiac vehicle, you may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on...
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.
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.