No solid misfire till I changed plugs and wires

Asked by DUB_BEASLEY Jul 21, 2020 at 05:01 AM about the 2001 Chevrolet Suburban 1500 LS RWD

Question type: Maintenance & Repair

Before I change the plugs and wires
yesterday it had a random misfire
detected p3000 code and it was
barely noticeable until I changed the
plugs and wires yesterday it ran
perfect for about an hour after that
it's been it's like it's running on four
of the eight cylinders...... Just for
reference I have changed the fuel
pump fuel filter do regular throttle
body cleaning.....please help me I
need this truck for my job

1 Answer
27,530

oilyspill answered 4 years ago

Alot of things can cause misfire, fuel, spark , compression. If you think it is spark, you can take a digital multimeter, lo voltage setting, Engine idling, tough spark plug wire with meter lead, you know how to use digital multimeter, correct. You don't take the plug wire loose or penetrate the insulation, it's an inductive reading. I've seen readings like .6 or .7 volt, not even a full volt. now, if you find reading, bouncing off zero, there is your problem. Maybe a coil issue? The problem may not be spark? any applicable trouble codes? Is this vehicle coil near plug ignition?

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