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2001 Chevy Avalanche Lossing Power and Backfiring

I have a 2001 Chevy Avalanche down in Southern Baja Mexico. Not many mechanics around so diagnosis is pretty much left to me. Here's what happened. I bought the truck here in the US. Drove it around for a few months before driving it to Mexico to make sure everything was OK. And it was. After 4 days of driving and about 4 hours away from my place down there is when the first signs of a problem came up. I had just filled up in Loreto, after driving for about 30 miles I was following a slow car down a hill. My foot was off the accelerator. At the bottom of the hill when I went to accelerate the truck died. It started right back up. After that it seemed to really struggle up hills. Hesitating and some times dying. After dying it always starts back up. and if you really step on the pedal it resonds just fine. Didn't seem to do it much when cold, and mostly a real problem going up hills. There was a ping in the engine that I assumed was from to low of an octane gas. I started putting high octane. The ping went away but the hesitation and stalling did not. The check engine light would sometimes be on sometimes not. When scanned it came up with 2 sensors that I didn't think were such a big deal. The Mexican mechanic thought the problem was with the catalytic converter. He took it off. Now the problem is not as much stalling but now backfires to the point that it blew off the muffler last time I drove it. I am back in the US and would like to try and buy parts for a fix before heading back down. HELP.

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Losing power and backfiring could be because of a bad mass air flow sensor . Could have jumped time , timing chain

Posted on Jan 05, 2015

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  • aaron wight
    aaron wight Jan 05, 2015

    Does the catalytic converter being taken off create a problem with the computer figuring out the fuel air mixture

  • Jeff Armer Jan 05, 2015

    You didn't disconnect the front o2 sensor did you ?

  • aaron wight
    aaron wight Jan 05, 2015

    I'll have to look. The mechanic took it off

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Having the codes will help
my 2005 have a bad coil pack
which would make hesitation but not stall
also put light on sometimes
I changed coil no light

Posted on Jan 05, 2015

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