Question about 2002 Chevrolet Avalanche

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Chevy reduced engine power

I have a Chevy avalanche 2500 2002 8.1 liter I drove thought some high water here in Pensacola and getting home truck started to sputter and stall I got it home and cranked it next data lot of white smoke but couple of days ran better but to be sure no water in gas put some sea foam in tank yesterday got almost home lost power going up driveway barely got up . I have scan tool and got this code P0102 mass air flow or volume air flow sensor circuit low and also TP sensor1,2 circuit also says reduced power on message board

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  • Chevrolet Master
  • 53,755 Answers

Check all harness connections for water
check for water at the ecm connections if under bonnet
check for water wet air filter
good motto --don't drive through water deeper than the tires from road to rim

Posted on May 12, 2017


6 Suggested Answers


6ya staff

  • 2 Answers


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Posted on Jan 02, 2017


George Fischer

  • 236 Answers


sounds like you have a cracked header or engine block. would take it to a mechanic quick

Posted on Jun 17, 2009


  • 2 Answers

SOURCE: Won't crank....seems as if its not getting spark.

sounds like a fuel pump problem. if you have ran out of gas, the fuel pump probably is burned. with the new battery the engine crank?? if your answer is yes, im sure the problem is the fuel pump.

Posted on Jul 03, 2009


  • 80 Answers

SOURCE: P0102 Code on 98 Chevy 2500 van

Check to see if the pink wire on the mass air flow connector has voltage with key on.It come's from fuse #15 inthe under hood power box.Also called eng 1 fuse.If voltage is present try the old trick of using carb cleaner to see if you have a vacuum leak.that will also cause a high idle oon fuel injected veh.If you can't find anything ther your going to need to see your mechanic to trace the trouble tree down for that code.There is a long process for that code. Good luck.

Posted on Aug 11, 2009

Testimonial: "Very good advice, tried all. I now have replaced the throttle positioning sensor and cleaned the idle air control valve. Working but engine light on"


Harvey N Tawatao

  • 3854 Answers

SOURCE: 98 chevy suburban, code reads mass air flow sensor

Check the wire leads and clean them before reconnecting the wire leads. It wouldn't hurt also to clean the MAF sensor with MAF cleaner, the code your getting is most common to the high performance oil base filters like K&N.

Good luck and this should help you resolve your MAF issues. Thank you for using Fixya

Posted on Mar 12, 2010


Darryl Kazemba

  • 1190 Answers


Hello' With carburetor cleaner check for vacuum leaks around the rubber hoses coming off the intake manifold. Check for leaks at the intake manifold where it mounts to the engine. If engine speeds up when you spray that means you have a vacuum leak.

Posted on Dec 14, 2010

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