multiple random misfires

Asked by Jan 30, 2014 at 02:41 PM about the 2001 Chevrolet Express G3500 Passenger Van Extended

Question type: Maintenance & Repair

Ok...Hopefully someone will be able to help. I have been getting p0300 codes coming up on '01 Chevy Express 3500 (5.7 litre) over the last week. It only throws the codes while I'm idling. I have checked and repaired a couple vacuum lines, cleaned the mass air flow sensor, cleaned the throttle body, installed new plugs cap and rotor, ran fuel injector cleaner through the fuel system, checked the for intake manifold leaks, etc., etc,. Today I decided to pull the plug on the maf sensor, all of my misfires dissapeared and my van was running great. Since I figured that was the issue, I bought a new maf sensor and installed it, cleared the maf code and started it up. Not even a minute later, it started throwing p0300 codes again. I unplugged the new one and the misfires vanished. Has anyone had any similar experience? I'm at a loss, and don't want to just throw money at it. Thanks in advance

4 Answers

67,375

Did you replace the spark plug wires when you changed the plugs cap and rotor? If not, that could be causing the misfiring. Always replace the wires when you do a tune up. It's good preventative maintenance. HTH. -Jim

I did on the last tune up. I still am not getting my head around it running great when I unplug the maf sensor, then starts misfiring right away as soon as it gets plugged back in.

20

I dont know, having the same problem with my 2001 jetta, any luck?

2 of 2 people found this helpful.

I'm having the same problem with my bmw 330ci

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