Skip the auto shop - Our mechanics make house calls

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.

A: Intermittent and random misfires can be c...

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?

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: if you jump start a car and it shuts off as soon as you take off the cables is the alternator bad

Hello. Yes, a car that shuts off as soon as the cables, or power source are removed can indeed be an indicator of a bad alternator. I would remove and test the alternator before replacing it just to be sure....

Q: Car won't start

There may be multiple issues going on here that may all ultimately contribute to a misfiring situation. If the throttle body is still gummed up, this will obviously create an issue with fuel/air flow. The spark plugs may also be...

Q: Replaced transmission cooler but its still not shifting could this be because it's now in limp mode

Hello. Shifting problems can be caused by a wide variety of things. Some vehicles are equipped with more than one shift solenoid and will have issues shifting if one of them fails. It may also be possible that the pressure...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...