CHEVY ROUGH STARTUP IN COLD WEATHER

2002 Chevrolet Avalanche

Tiny

cowboybob

January, 20, 2010 AT 2:46 PM

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.

FOUND 10189 RELATED QUESTIONS

1 Answer

Tiny

rasmataz

January, 20, 2010 AT 4:05 PM

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

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