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Random Misfire and Fuel Pump Diagnosis
Random Misfire was solve: #2 had a broken valve spring. P0300 code & miss finally went away. Still no clue as to why PCM is not signaling fuel relay to activate. No security message or light in dash, engine cranks fine. When I disconnected PCM connector and applied 12V to the connector's #9...- i2bme
- Post #7
- Forum: Engine & Drivetrain
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Random Misfire and Fuel Pump Diagnosis
Thanks, makes sense. I will use light as much as possible as I search for lack of input to fuel pump relay.- i2bme
- Post #5
- Forum: Engine & Drivetrain
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Random Misfire and Fuel Pump Diagnosis
Thanks BRUTUS_T_HOG, I'm sure the uneven compression adds to the roughness, but it feels and sounds like a cylinder is missing, like a plug wire is off. Theft light is not flashing. I haven't measured amperage of test light, but I am confident it is under 500mA. I'll check it. Pin...- i2bme
- Post #3
- Forum: Engine & Drivetrain
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Random Misfire and Fuel Pump Diagnosis
Hello All, My daughter's 2004 Tahoe, 4.8L, 178K miles, was idling and running very rough and stalling often. She was told that she needed to replace the coils, plugs & wires which she did, but it did not help. I towed it home to try to fix it. It was showing a P0300 code: random misfire...- i2bme
- Thread
- Replies: 7
- Forum: Engine & Drivetrain
