Ok everyone, I need some expert advice. I started with a p0300 code (random/multiple misfire) and replaced a bunch of parts trying to fix it. I have replaced the fuel filter, spark plugs and wires, cap and rotor, and coil. Finally I got a fuel pressure gauge that worked correctly and found out it was loosing fuel pressure after the pump shut off. I isolated it to the fuel pump, not the injectors. I replaced the pump and sending unit assembly and that fixed the fuel pressure loss.
Now I am getting a p0306 code. I checked compression and it is at 150, just like the number 4 cylinder, so I don't think compression is the problem. The new spark plug has some carbon fouling already, so I'm guessing it's getting fuel. First thing i did was swapped the cylinder 4 and 6 wires to rule out the new wires, no fix. Then I swapped the same spark plugs and no fix. I bought an inline spark tester and found it missing a spark every so often at higher rpms.
What could be the culprit of this? It has to be something in the distributor, correct? Unfortunately I already threw out the old cap and rotor, so I can't swap them back in to see if something is wrong with the new cap and rotor. Is there any other way to test the cap and rotor without buying another set? Am I better off replacing the entire distributor? Anything else I am overlooking? Thanks for any help!
Now I am getting a p0306 code. I checked compression and it is at 150, just like the number 4 cylinder, so I don't think compression is the problem. The new spark plug has some carbon fouling already, so I'm guessing it's getting fuel. First thing i did was swapped the cylinder 4 and 6 wires to rule out the new wires, no fix. Then I swapped the same spark plugs and no fix. I bought an inline spark tester and found it missing a spark every so often at higher rpms.
What could be the culprit of this? It has to be something in the distributor, correct? Unfortunately I already threw out the old cap and rotor, so I can't swap them back in to see if something is wrong with the new cap and rotor. Is there any other way to test the cap and rotor without buying another set? Am I better off replacing the entire distributor? Anything else I am overlooking? Thanks for any help!