2007 Chevy Express 3500 check engine light code p0300
August 12th, 2019, 5:14 PM
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2007 Chevy Express 3500 check engine light code p0300
I just recently had a new crate motor 6.0 vortec installed in my work truck. the mechanic is struggling on finding out the reasoning behind the random missfire code p0300
we have done the following and still have a random missfire on cylinder 4 and 7 but only at 70-75+ mph on the interstate. otherwise no missfires
new crate motor
new plugs and wires
No.7 has a new coil
Tested each injector for fuel pressures which was all running same pressure
any suggestions on what to check now?
we have done the following and still have a random missfire on cylinder 4 and 7 but only at 70-75+ mph on the interstate. otherwise no missfires
new crate motor
new plugs and wires
No.7 has a new coil
Tested each injector for fuel pressures which was all running same pressure
any suggestions on what to check now?
August 13th, 2019, 8:53 AM
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August 13th, 2019, 5:29 PM
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