Skip the auto shop - Our mechanics make house calls

Q: 1997 Saturn

asked by on

Coil packs getting fire. Runs rough. Backfires when I step on the gas pedal and no power and the service engine soon stays on flashing? I've replaced plugs and coil pack reset the SES light but it still does the same thing. Is it the crank position sensor?

My car has 120000 miles.
My car has an automatic transmission.

Hello, thanks for writing in. Since the check engine light is on the best place to start is with the codes. These would help me to determine the problem. It sounds like there is a misfire problem. If that is also associated with a backfire, then you may have a bad valve seat which is common on this engine. A compression test would need to be done to verify this. If the compression is fine then it may be a sensor issue or the wires may be installed wrong. If you want to have this backfire checked, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Q: Misfiring

Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft...

Q: Throttle body needs to be fixed and I want a estimate Also want to know if the $70 is for inspection only?

Billing question is sent to CS for the cost to repair or replace the throttle body and the cost for an inspection.

Q: The gears?

Hi There, It sounds like your transmission may be low on fluid or possibly have a faulty control solenoid. When you rev the engine to get it to go forward, this is an indication that the transmission is producing more...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...