Hi all

Can anyone tell me what are the most common causes of a P0300. My truck threw the code today this morning, so i cleared it and it threw it again later this afternoon. The thing is i didnt feel anything different with it at all. No shudder no sluggishness nothing

Thanks

 

Google:



A code P0300 (random misfire) may mean that one or more of the following has happened:

• Faulty spark plugs or wires
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector(s)
• Burned exhaust valve
• Faulty catalytic converter(s)
• Stuck/blocked/leaking EGR valve / passages
• Faulty camshaft position sensor
• Defective computer

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

 

P0300 Multiple Cylinder Misfire

Tuneup time?

SJ03

 

Jinx! Lol

sj03

 

Ha! Yes, I'd start with a general tune up.

 

Recent tuneup was done back in November while stripping down the right dylinder head that had dropped a valve seat. I replaced all plugs and coil packs, cleaned the MAF and throttle body. Im jut paranoid that this may relate to the problem eccountered in November.

Basically

Stuck thermostat lead to over heat which in turn split radiator and then while trying to get home, some 3 miles away at that time it dropped seal in #2 cylinder causing valve to lodge open, rocker arm dropped off and then must have lodged against lifter valve housing and consequently smashed the housing

At that stage i had not just a P0300 it said it was a multiple cylinder misfire.

But this just says random

 

So it's done it again today only this time the check engine light came on and within 30 seconds went off. Code was still stored and was again
P0300

 

So have you checked anything mentioned above?

 

Plugs and coils are new. Not sure how to check the egr and cps.

Thanks

 

So perhaps I should go buy a maf sensor cps and egr to eliminate those?