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: Car sporadically idle high & runs around 1500 RPMS

Hi there. The most common causes of this on your vehicle are either a bad idle control valve, a dirty or failing throttle body, or a vacuum leak. It is very common for the engine to have a vacuum leak...

Q: Car died while driving it wont start only cranks

Hello, thank you for writing in. The vehicle may be having one of several problems. Make sure the engine is getting proper fuel by testing the fuel pressure. You can also test this by spraying starting fluid in the air...

Q: Startup difficulty

Hello there, a few different things can cause an intermittent no start condition. The most likely causes are the battery, fuel pump, starter, ignition switch, battery cable or a wiring fault. You have replaced a few of these components, but...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...