Po300 code in 5.7 vortec 1997
5 Answers
Thanks I have replaced spark plugs, distributor,rotor , wires any also set TDC my scanners show number 2 and 6 might be the problem any ideas thx
BestchoiceautoGuru answered 6 years ago
You might have FUEL INJECTOR(56-62psi) or FUEL METER BODY (60-65psi) $225. This could be a hard problem to diag, and the OBDII system is not very smart back then. Even the dealer has a problem to confirm it. Sometimes you just have to take a chance. Is the symptom very pronouns? Like power lost or frequent missing. You also have to check fuel pressure, and they have to fall in the range as indicated above.
BestchoiceautoGuru answered 6 years ago
By the way, you also need to get a reading on all the cylinder pressure before you spend any money.
thanks for the reply , the vehicle was running perfect before the manifold gasket change, I had a mechanic clean the and replace plenum gasket you think he might be the issue