Check Engine Light Flashing..P0300 Code..
Thread Starter
Drifting
Joined: Jan 2008
Posts: 1,752
Likes: 62
From: New Madison Ohio
Check Engine Light Flashing..P0300 Code..
I was driving yesterday car started running really bad and rough idle when at stop. I checked the codes and got the P0300 which I knew from checking is a misfire. I unhooked each fuel injector individually and the only one that seemed to have any effect on the engine while running was the first one on drivers side which would be #1 cylinder. The others seemed to have no effect. Would I be right in saying that this injector would be the cause of my problems? Any input would be appreciated..I did post in tech..
Instructor
Joined: Aug 2015
Posts: 115
Likes: 15
From: IL
I was driving yesterday car started running really bad and rough idle when at stop. I checked the codes and got the P0300 which I knew from checking is a misfire. I unhooked each fuel injector individually and the only one that seemed to have any effect on the engine while running was the first one on drivers side which would be #1 cylinder. The others seemed to have no effect. Would I be right in saying that this injector would be the cause of my problems? Any input would be appreciated..I did post in tech..
Did you just fill up ?
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 479
From: OK
I was driving yesterday car started running really bad and rough idle when at stop. I checked the codes and got the P0300 which I knew from checking is a misfire. I unhooked each fuel injector individually and the only one that seemed to have any effect on the engine while running was the first one on drivers side which would be #1 cylinder. The others seemed to have no effect. Would I be right in saying that this injector would be the cause of my problems? Any input would be appreciated..I did post in tech..
As mentioned above it might be bad gas...
I'd try a can of Seafoam and see if it helps...
P0300 is random/multiple misfire.
You may want to try a good OBDII code scanner to get the freeze frame data (conditions when it sets the code)
Random misfires that jump around from one cylinder to another (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.
Other things to check...
coil packs
injectors
vacuum leak/s
Even more things to check...
oxygen sensor/s
cat/s
valves
pcm
Last edited by 73Corvette; Jul 14, 2016 at 12:21 PM.
