Q: Misfire P0304 and shaking

asked by on

Cold engine everything OK. Warm start shaking on idle. Shaking is increasing and becoming ok. injector been cleaned ultrasoud . Changed plugs, vt leads, coil. Can't see so far drop of power

My car has 70000 miles.
My car has a manual transmission.

Hi there. From the description you have provided, your vehicle’s P0304 misfire needs to be properly diagnosed since replacing components is not working. It could be low compression in that cylinder. This could account for not feeling the miss cold.

Increased RPM can overcome slightly low compression. A compression test should be performed, to rule out a mechanical failure. It could also be a faulty fuel injector electrically failing with increased temperature.

Resistance increases with an increase in temperature. It could be a poor electrical connection again, showing up with increased temperature. Circuit tests should be performed. I recommend having you vehicle’s Check Engine Light diagnosed and repaired by a certified technician, such as one from 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. Misfire P0304 and shaking

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: Grinding noise on the right front wheel when turning right/going straight accelerating at low speed.

Hi there. At first glance, I would assume the grinding noise is caused by a damaged wheel bearing. When the wheel bearing is starting to fail, it looses lubricity; which causes metal-to-metal contact and a grinding noise is often the...

Q: Don't understand CEL Codes.

The codes P0300 through P0306 are for misfires of random cylinders or different cylinders. The second code P1456 is for the evaporative fuel tank system having a leak somewhere in the system. Since you are getting random misfires, then I...

Q: Q: Car starts and shuts off

Hello. If the engine only runs for a second and then turns off then that usually means that the engine was not timed right. You will need to remove the distributor and retime it. It can also be a defective...

Related articles

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.