Po300 code in 5.7 vortec 1997

50

Asked by Cbca Feb 05, 2018 at 08:01 PM about the 1997 Chevrolet C/K 1500 Silverado Extended Cab 4WD

Question type: Maintenance & Repair

Po 300 code on a 5.7 vortec 1997 k1500

5 Answers

50

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

5 people found this helpful.
460

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.

460

By the way, you also need to get a reading on all the cylinder pressure before you spend any money.

1 people found this helpful.
30

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

3 people found this helpful.

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