Help! engine missing - P0300 code
Thread Starter
Melting Slicks
Joined: Aug 2005
Posts: 2,993
Likes: 61
From: Fort Wayne IN
Help! engine missing - P0300 code
Shortly after filling up with premium the car started missing and the check engine light started flashing. I suspect bad gas, either crap or water or both. What's the easiest way to check the fuel? Or to drain the entire tank? If the injectors are clogged is there a way to tell? And how are these cleaned?
Many questions but I appreciate any and all input.
Many questions but I appreciate any and all input.
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
P0300 is a general misfire code, if you have access to a scanner then it might be able to narrow your problem down. If your misfire is from a particular cylinder then the scanner will display the code as P-030X (X will be the bad cylinder), in other words if the scanner shows P-0305, then cylinder #5 is the misfire. if the scanner still shows P-0300 then it is a random/multiple cylinder misfire and then it could be a number of problems.
Is there a reason you suspect bad gas?
Is there a reason you suspect bad gas?
Thread Starter
Melting Slicks
Joined: Aug 2005
Posts: 2,993
Likes: 61
From: Fort Wayne IN
P0300 is a general misfire code, if you have access to a scanner then it might be able to narrow your problem down. If your misfire is from a particular cylinder then the scanner will display the code as P-030X (X will be the bad cylinder), in other words if the scanner shows P-0305, then cylinder #5 is the misfire. if the scanner still shows P-0300 then it is a random/multiple cylinder misfire and then it could be a number of problems.
Is there a reason you suspect bad gas?
Is there a reason you suspect bad gas?
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
What DTC data is the car showing ??? As runamuk said, you probably have a P0300 for the misfire, but are there any other codes ???
There are two fuel tanks, and they can be drained by disconnecting the feed hoses and letting the fuel run into a storage container. Each tank holds about 9 gallons, so you will need enough gas cans to hold about 18 gallons of fuel. I would recommend holding off on doing this yet .....
I'd start by checking the engine ground straps (G104, G105,, G106, G107), if one is coming loose it can cause a miss. Also check visually the spark plug wires ..... make sure they are all snapped onto the coils and plugs .... one may be partially off.
Again, check for DTC posted, especially any PCM codes.
Last edited by BlackZ06; Apr 17, 2008 at 12:20 PM.
Thread Starter
Melting Slicks
Joined: Aug 2005
Posts: 2,993
Likes: 61
From: Fort Wayne IN
Did you put the Techron in before adding the fuel, or after ?? It is possible you "stirred" something up, but the fuel filter should have caught anything before it got to an injector.
What DTC data is the car showing ??? As runamuk said, you probably have a P0300 for the misfire, but are there any other codes ???
There are two fuel tanks, and they can be drained by disconnecting the feed hoses and letting the fuel run into a storage container. Each tank holds about 9 gallons, so you will need enough gas cans to hold about 18 gallons of fuel. I would recommend holding off on doing this yet .....
I'd start by checking the engine ground straps (G104, G105,, G106, G107), if one is coming loose it can cause a miss. Also check visually the spark plug wires ..... make sure they are all snapped onto the coils and plugs .... one may be partially off.
Again, check for DTC posted, especially any PCM codes.
What DTC data is the car showing ??? As runamuk said, you probably have a P0300 for the misfire, but are there any other codes ???
There are two fuel tanks, and they can be drained by disconnecting the feed hoses and letting the fuel run into a storage container. Each tank holds about 9 gallons, so you will need enough gas cans to hold about 18 gallons of fuel. I would recommend holding off on doing this yet .....
I'd start by checking the engine ground straps (G104, G105,, G106, G107), if one is coming loose it can cause a miss. Also check visually the spark plug wires ..... make sure they are all snapped onto the coils and plugs .... one may be partially off.
Again, check for DTC posted, especially any PCM codes.
Thanks
