Q: Car is showing random misfire code po300

asked by on

I accidentally let go of clutch and gas in 1st gear causing car to turn off and jump foward, after i turned car back on it started shaking extremely bad, check engine light came on and now idles rough at 100 rpms normally would be at 1000 rpms. While driving it home like that i noticed that normally i would change gears at 3500 to 4000 rpms instead it was needing to change at 2000 rpms no matter what gear i was in. Ive changed the spark plugs, spark wires, coil pack but i dont want to keep wasting money on random stuff im hoping someone has had this happen to them i need help please

My car has 123000 miles.
My car has a manual transmission. Here is video link of my car.
https://m.youtube.com/watch?v=BrA6CY3R6uU&feature=em-upload_owner

The only sensor that will cause the RPM gauge to read incorrectly and cause a rough running engine is the crankshaft position sensor, or its wiring and connector. Try and disconnect the crankshaft sensor connector located above the oil filter on the side of the engine block. Look for any damage to the sensor or the connection. If you do not see any damage then the sensor should be tested or replaced and the codes cleared to see if it corrects the problem for you.

If you need assistance, a certified mobile mechanic can come to your home or office to inspect your vehicle’s issues and provide any necessary repairs.

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. Car is showing random misfire code po300

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: Car jerks when accelerating in reverse & makes grinding noise. Is this a transmission or computer issue?

Hi there. Typically when you hear a grinding noise when you move forward or in reverse it's usually an indication of a gear fault either in the transmission or another driveline component. If this occurs only when in reverse, it's...

Q: Engine is possibly ceased up.

Hi there. If you are able to crank the engine over and the engine does turn over, then the engine is not seized up. However, if the engine hesitates as its turning over, then the timing belt may have either...

Q: When i purchased my used car the check engine light was on . But I was told it was nothing that it would go off . A week later my

If oil and coolant have mixed or are mixing, whether in the radiator or in the crankcase, the cause of those "leaks" has to be identified and repaired first. If you were to diagnose the no start condition, even if...

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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...