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Codes P0101, P0300, and P0420

TUFFTRUX

By TUFFTRUX
in Ask A GM Technician

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TUFFTRUX Enthusiast

TUFFTRUX

Posted
Posted

Hi,

 

Vehicle: 2000 GMC SAVANA 2500 (G2500), 5.0L V8 Gas original engine, 4L60E transmission (rebuilt), vehivle mileage>220,000 Miles. Vehicle is used as a delivery van in NYC.

 

My van's engine is running very rough and is hard to start. On start up there is some black smoke and there is much more emissions than usual. It can barely idle, I need to keep my foot on the gas to keep it running. I also seemed to lose the vacuum assist for my brakes because of the rough idle. When I rev up the engine the brake pedal seems to work but at idle the brake and ABS light would light up. It began doing this after a boston round trip run. The brake problem happened after I parked it overnight. I pulled these codes from the computer:

 

P0101: MASS OR VOLUME AIR FLOW CIRCUIT RANGE PERFORMANCE PROBLEM

P0300: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED

P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)

 

what needs to be done to get the truck running smoothly again? Will changing the mass air flow sensor fix the problem or is it more serious?

 

Also, The truck seems to need a new transmission as the oil looks and smells burned but I'm not sure if the engine and trans. problems are related?

 

Thanks for your help,

Luke

jbabb New Member

jbabb

Posted
Posted

My Z71 is having the same problems. I also pulled the misfire code and the catalyst code. Now my truck is sitting in the parking lot and will not start. It is a 99 model with the 5.7L with about 143000 miles on it. I am also starting to experience some transmission problems. I was told from a friend in the car business that it could be a stopped up catalytic converter as well, but, how would you unstop it or do you have to buy a new one. I would also love any help on this problem that I can get. Thanks in advance.

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