Q: Misfire still after tuneup

asked by on

Misfire cylinder 1. I changed sparkplugs on all cylinders and crankshaft sensor and changed coil only on cylinder 1. Still have a misfire in cylinder 1. Please help

My car has 168000 miles.
My car has an automatic transmission.

Hi there. If the spark plug, plug wire and ignition coil are good, then the issue may be inside of the engine. I would do a compression test first to see if there is any internal failure. If the compression is fine, then I would check the fuel injector and the ignition coil. I have also seen oil get into the spark plug hole and cause this, but that should have been seen and repaired during the tune up. If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your misfiring issue and make any repairs to resolve your issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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 still after tuneup

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: New EGR Transducer Leads To Other Issues?

Hi there. Look to see where the EGR (Exhaust Gas Recirculation) is plumed into the engine. If the EGR is plumed into the cylinder number 3 and the EGR has a leak, then the cylinder number 3 will be weak...

Q: I am having a chirp/squeak sound coming from my rear end

Hello, thanks for writing in. If the problem occurs as the wheels are spinning then it typically means that something is rubbing. Most of the time this comes from the braking system. It is common for the rear brakes to...

Q: Where are both transmission fluid dipsticks

Hi there, thanks for writing in about your 2004 Subaru Baja. There is only one place to check the transmission fluid on your vehicle. There will be a dipstick with a yellow handle near the rear of the engine compartment...

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...
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...