Q: Engine misfire cylinder 3
I'm having a misfire coming from cylinder 3. Replaced coil and plug. Tested compression coming back at around 105 every other cylinder is 125+
My car has 110000 miles.
My car has an automatic transmission.
Recommended Services
| Valve Clearance Adjustment | Get a Quote | |
| Engine is misfiring Inspection | $94.99 - $114.99 | Get a Quote |
The misfire could very possibly be from low compression. You want the compression across all cylinders to be within 10% of each other at most. The compression for number 3 is under that threshold. It could be caused by worn or cracked piston rings, damage to the cylinder walls, or possibly from misadjusted or damaged valves.
I suggest you verify the valve adjustments to make sure that the valves are correct. You may also want to find someone that has a borescope to inspect the cylinder walls and pistons for damage.
If you’d like some assistance with a more in-depth diagnosis of your misfire, consider YourMechanic, as a one of our mobile exerts can come to your home to service the car. Best of luck.
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