Mechanics

CHEVY ROUGH STARTUP IN COLD WEATHER

2002 Chevrolet Avalanche

Engine Performance problem
2002 Chevy Avalanche V8 Four Wheel Drive Automatic 113000 miles

My 2002 Avalanche with 113,000 miles on it has a problem with a very rough start up during cold weather (below 40 degrees). It bucks and jumps and surges and misses for about 5-7 minutes. Once it is warmed up it seems to run fine. The engine light does not come on. For these vehicles and engines I have read that it could be a manifold leak, a faulty gas pump, an air throttle valve problem or using 10% ethanol fuel. I have yet to take it to a repair shop. I am curious as to what the real problem might be since this problem seems to be fairly common.
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Cowboybob
January 20, 2010.



Hi cowboybob, Welcome to 2carpros and TY for the donation

Clean out the idle air control valve, test the following coolant temperature, throttle position, and manifold absolute pressure sensors-to include the PCV and EGR valves

Rasmataz
Jan 20, 2010.