Question about 2002 Chevrolet Astro

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Was getting around 18mpg, recently I pulled out in traffic and had to gun-it. A short time later I was going no-where. Had to pull over several times before realizing I could go, but only at a low "55-60" mph. Made it home, disconnected the battery and reset obd. Next few days, could go almost like normal, but still lacking power on the interstate with easy uphill grade. Transmission seams to shift through 1,2,3, to D , O'kay, but not able to hold 70-75 speed. Now getting around 14mpg. Replaced the speed sensor, cleaned the MAF sensor, finally today got a code for bank 1 oxygen sensor. Not sure if it's bogus yet or not. Intown driving - plenty of power, cruising down interstate - sometimes falls on face, and now down to around 14mpg.

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  • Mark A. Rouse Oct 26, 2012

    OBDII Keeps reading MAF, Cleaned this, but keeps showing up after eraseing code.

  • Mark A. Rouse Oct 27, 2012

    Could a bad MAF sensor cause this?

  • Mark A. Rouse Oct 27, 2012

    I don't think it's a fuel problem, I can check that off the rail.

  • Hector L. Morales Oct 27, 2012

    Bank #1 Sensor???  Is the code for slow to react, lean, rich, heater circuit...???  Faulty MAF sensor giving the computer incorrect info and affect performance, fuel strategy and O2 readings...  Codes and definitions may help get to the bottom of it.  post as much detail info as you can. 

  • Mark A. Rouse Oct 27, 2012

    I also replaced a bad thermostat because the engine wasn't getting hot enough,and that code was popping up. That is now clear. Now that the engine temp is right, could that have awaken the 02 sensor?

  • Mark A. Rouse Oct 27, 2012

    When it get's sluggish on the interstate, and I'm trying to accelerate, there is alot or air flow sound?

  • Mark A. Rouse Nov 09, 2012

    Does anyone know about the Power comand module and the Torque converter clutch? Could this be my problem, and maybe fixed by reprogramming the PCM?



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  • Chevrolet Master
  • 2,431 Answers

A MAF can also be set if you have a partial plugged catalytic, or a stetch chain ,a stretch chain I would doubt,But a pulgged catalytic yes,As for the thermostat yes it can wake the 02 sensor when a vehicle is not at operating temperature your system goes in open loop,which ignores the 02,As for the torque convertor clutch you would have a code for it not a MAF code, and by the way a leaky fuel pressure regulator can cause your problem also

Posted on Nov 10, 2012


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Posted on Jan 02, 2017

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SOURCE: rough idle, power loss while driving

check /replace the fuel filter and check the fuel pump pressure before and after the bleed valve to the throttle injectors

Posted on Jan 20, 2010

SOURCE: I have a 2002 Chevy

Not the fuel filter

More like a vacuum leak

Posted on Apr 13, 2011

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