P0300 Diagnostic Code - Random Misfire
Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues
Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM
The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.
p0300 is random misfire
The 2001 Chevy Blazer does have an ignition security system that is controlled by the computer in the vehicle. The light might come on because of an error that is coming up in the computer due to a key problem or an ignition problem. This is a common issue with the 2000 and 2001 Blazer.
Replace the ignition module and see if that don't fix your problem.
yes it would or it might be the starter
you could try disconnecting both battery leads for 5 mins or so. See if that helps any. There is also a computer fuse in the fuseblock.
Will a 1997 blazer what work on a 1999 blazer????? If your talking engine, transmission, or running gear than yes. It is all the same.
As long as the intake matches and you have the computer.
i think about every s10 blazer has had this problem,lol this is very common. Usaull problems are evap canister or tank vent port leaking, your computer can detect 1\16 of an inch of a leak, The cheapest thing is to check your gascap for a leak, if you let your vehicle run with the gas cap off, like getting gas for example that could have set that code off.
I had that problem on my 94 Olds Bravada, a vacuum hose came loose running to the intake plenum.
There is a problem with the emmission system are transmission and the computer turns the engine light on to let you know there's a problem. Have engine scanned with a OBDII engine scanner.
If the engine is running, this is normal. If the engine is turned off and the pump continues to run all the time there is a problem, possibly a faulty fuel pump relay.
take it two a auto zone and they will hook up 2 your computer and give any codes needed
trying to fix simular problem