Skip the auto shop - Our mechanics make house calls

Q: Misfiring and p0300 code

asked by on

My car started misfiring and found a coolant leak at my coolant elbows or water pump bypass elbows could replacing these fix my misfire

My car has 143000 miles.
My car has an automatic transmission.

It may be possible the misfire is from coolant leaking onto the plug wires. You will need to fix the coolant leaks first and at the same time make sure the camshaft and crankshaft position sensors did not get coolant in their connectors. I’d suggest cleaning them out and applying dielectric lube to connections.

If you need some assistance with this, consider getting help from a local mechanic or a mobile technician from YourMechanic. They will be able to help diagnose your misfire and make the necessary repairs to get you going again. Good luck!

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: Diagnose torque converter selenoid or transmission

Hi there. The computer could be putting the vehicle into limp mode due to an issue that may be happening and reduces the engine performance. Check the battery, alternator, and all of the sensors on the engine and make sure...

Q: My abs light came on after I got my wheel bearing fixed.

Hi there. Check the wheel bearing to see if the wheel speed sensor was plugged in. Those indicator lights will come on when the sensor is left unplugged. As for the engine having a misfire, check the spark plugs and...

Q: I have a 2006 impala and as of Wednesday i experienced my car wobbling what could be the cause of this?

Hi...I will help you with this. There are quite a few components in a vehicle's suspension and so it is hard to predict definitively what the cause is until the vehicle is inspected. If you want your vehicle's suspension inspected...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.