Skip the auto shop - Our mechanics make house calls

Q: Misfire on cylinder 4

asked by on

Hi, 1997 Chevy K1500 5.7L V8 here with a misfire on cylinder 4. I've replaced distributor cap, rotor, wires and spark plugs and nothing improved. Spark is good. Changed out the spider injector and used a "pop-it" light to check that a signal is being sent into the spider injectors. All is good. O2 sensors are new. Both catalytic converters are 2 years old. What gives?

My car has 190000 miles.
My car has an automatic transmission.

If both fuel and ignition are good, then it may be a mechanical issue with cylinder #4. A compression test may be a route to take. Considering the age and mileage, a worn intake or exhaust valve, or possibly valve seats can be allowing compression to leak past and cause a misfire. It can also be a "sticking or lazy" valve lifter. If the #4 valves are not opening/closing in proper time, this can also cause a misfire.

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
  1. Home
  2. Questions
  3. Misfire on cylinder 4

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: 1989 Chevy Celebrity dies, is it the fuel shut off switch?

First of all, I don't see that your vehicle is equipped with an inertia switch. Secondly, even if it were, it would not cause the problem you are having. A tripped inertia switch would prevent power from getting the fuel...

Q: No fire when starting my car

Hey There: Sorry to hear about the problem you're experiencing with your 97' Pontiac Firebird. What you're describing actually happened to an acquaintance of mine last year. He tried every trick in the book, including the "gas in the spray...

Q: Engine is hesitating during startup - 1989 Chevrolet K1500

Hi there. Check the static electronic timing with your ignition system. It seems as if the ignition timing is retarded and needs to be advanced. If your distributor is maxed out for advancement and will not move anymore, you will...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.