Skip the auto shop - Our mechanics make house calls

Q: What else can i do to diagnose the exact problem of my cars miss fire on the 3rd cylinder?

asked by on

Car is miss firing on cylinder 3. It uses alot of extra gas. It can barely pull hills.engine jerks when starting car. I have bought and put on the car a new fuel injector,spark plugs , wires, coil pack,fuel pressure regulator and ignition module. What else can I do!?

My car has 200000 miles.
My car has an automatic transmission.

A: If electronics and fuel supply have been ru...

If electronics and fuel supply have been ruled out, the next possible cause is a mechanical issue. Have a compression test done across all 4 cylinders. If #3 is lower than the other three cylinders, it is possible there is a damaged valve or piston/rings.

Have a certified technician, such as one from YourMechanic, complete a misfire inspection at the convenience of your home as another possibility is that there is no signal to cylinder #3 from the PCM. The PCM can be faulty and/or a break in the wiring harness between the PCM and cylinder #3.

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: Getting a '73 VW 3 to run again after sitting for a long time

You will want to make sure you are willing to put a lot of money into one of those things. If you do, the first thing you want to do is take all the spark plugs out. Get an oil...

Q: Turned car off and wasn't firing the plugs when I went to start back 1989 Pontiac Grand Am

Hello - this sudden failure is likely the crankshaft position sensor having failed. It provides a timing trigger for both ignition and the fuel injection system. Check first for blown fuses (ignition and fuel injection), then for problem codes, whether...

Q: transmission control module failing. We just replaced the computer module (pcm) 4 days ago?

The P0700 trouble code is a code for transmission control module (TCM) failure. Without knowing the other codes, it will not be possible to give you an accurate answer; it all depends on the other codes: If you get...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...