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5.7 vortec misfire


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Posted

I recently bought a 97 gmc sierra. It keeps giving me a p0300 code.  I have changed rotor, cap,1 injector, spark plugs and wires. I have checked the 02 sensors and they are fine.  I have spark and fuel in all 8 cylinders. I dont know what else to do. Can anyone help me?

Posted

Couple of things to check,lower intake gasket leaking, distributor drive gear for wear or timing chain slop,and fuel pressure,and clean the maf

Posted

I havent checked timing chain or distributor drive gear. It's a new maf and intake gasket.  Fuel pressure is good

Posted

Use a breaker bar and socket on balancer bolt,rock crankshaft back and forth,when it gets tough,that's when cam starts to spin,how much slop,and a good time to have distributor cap off,so when cam spins,does rotor spin immediately?

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