Lastwagen
01-20-07, 10:28 PM
I have a 98 S10 LS that has been throwing a P0300. I posted a thread about it earlier. I was retracing my steps and I know that it did this after a ignition tune and seafoaming. I know a little about P300 code but not how to find the possible causes
If you find a P300 code, it means the misfire is random and is moving around from cylinder to cylinder. The cause here would likely be something that upsets the engine's air/fuel mixture, such as a major vacuum leak, leaky EGR valve or unusually low fuel pressure (weak pump or faulty pressure regulator). There's really no magic bullet for finding misfires. It takes a certain amount of detective work to isolate the fault and determine the underlying cause.
I have replaced the plugs, wires, cap, rotor, fuel filter and cleaned the EGR. Where and how would you check for a major vacuum leak? I know that the fuel pressure regulator is housed inside the fuel meter cover, is there a way to get that out? I read in my service manual that you can't. I have looked all over for a replacement and have not found one. Is there anywhere else to track this damn P300 down?
If you find a P300 code, it means the misfire is random and is moving around from cylinder to cylinder. The cause here would likely be something that upsets the engine's air/fuel mixture, such as a major vacuum leak, leaky EGR valve or unusually low fuel pressure (weak pump or faulty pressure regulator). There's really no magic bullet for finding misfires. It takes a certain amount of detective work to isolate the fault and determine the underlying cause.
I have replaced the plugs, wires, cap, rotor, fuel filter and cleaned the EGR. Where and how would you check for a major vacuum leak? I know that the fuel pressure regulator is housed inside the fuel meter cover, is there a way to get that out? I read in my service manual that you can't. I have looked all over for a replacement and have not found one. Is there anywhere else to track this damn P300 down?