Q: Intermittent misfire that sets a random misfire code and three injector circuit failure codes.

asked by on

Intermittent misfire mostly when accelerating under load and hot. I have ran a couple bottles of Heet and and a couple bottles of Seafoam through the gas. I have cleaned the throttle body, IAT sensor, and IAC valve. I have replaced spark plugs, coil packs, throttle position sensor, camshaft position sensor, and crankshaft position sensor. And I have resistant tested the injectors (14.7 ohms each). However, it still misses intermittently.

My car has 109000 miles.
My car has an automatic transmission.

Hello.

Intermittent and random misfires can be caused by many things. If all of those components check out, it may be possible that one of the fuel injectors is dirty or clogged, and is not delivering fuel properly. It may be possible that one of the injectors needs to be cleaned or replaced. Random misfires can also be caused by fuel pressure issues, vacuum leaks, or engine management system issues. A technician from YourMechanic can come to your home or office to diagnose your misfiring issue and replace the fuel injector if necessary.

Regards,

Eduardo YourMechanic

Was this answer helpful?
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. Intermittent misfire that sets a random misfire code and three injector circuit failure codes.

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: Will replacing your O2 sensor stop your car from vibrating at a stop?

Hi there, thanks for writing in. The replacement of the O2 sensor might help reduce engine vibrations, but if you're feeling the shaking in the steering wheel when you slow down, it's most likely contributed to damaged brakes, wheel bearings,...

Q: I have Pontiac G6, it shakes when idle. Usually when I drive and stops on signal. I read some code and it shows P0300 and P0301.

The codes P0300 and P0301 are coming up for a misfire on cylinder number 1. Check the cylinder for spark, fuel, and air. Check the spark plug and make sure that it is firing. The spark plug wire could have...

Q: When driving the car it feels like it's gone into a higher gear.

Hello, thanks for writing in. Is your Check Engine Light illuminated? Your description sounds like your transmission may be in "limp mode" which is usually 2nd gear in many transmissions. It is also possible that the sensation you are getting...

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...
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...