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

Cbca answered 6 years ago

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

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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.

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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.

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Guru579W2 answered 6 years ago

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

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