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2002 2003 2004 2006 2007 4.2 4wd 4x4 a/c abs actuator air conditioning air suspension alternator amp arnott audio battery black bose brakes check engine light clean coolant custom differential electrical engine envoy exhaust ext fan clutch fuel fuel pump fuse gas gmc grille headlight headlights hid hids hvac idle ignition ignition switch install interior introduction leak led lift lift kit lifted lights misfire mod mods no start noise oem offroad oil olds bravada oldsmobile bravada p0300 paint pcm power steering radio rear reduced engine power replace rims rough idle sensor shocks speakers ss stalling starter stereo struts subwoofer suspension swap switch tbss tccm throttle body tires trailblazer transfer case transmission transmission problems vibration water pump wheels wiring xuv
  1. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Well after getting my envoy back together after cleaning the tb and clearing codes and a good few days of driving like a dream My truck idles rough smells like gas again then sputters and randomly stalls This time I got codes P0014 vvt solenoid? P0172 rich P0420 catalyst efficiency P0171 lean...
    p0014 p0171 and p0340 p0172
  2. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Hello everyone I recently saved a beautiful black 2003 envoy 4.2 with 200k from the crusher I need a little help getting her to run perfectly When I first drove it everything was fantastic no check engine just a little sluggish and a service 4wd light on. In the last few days of driving I...
    p0172 rpm's surging running rich sloppy shifting stalling with defrost on
  3. OEM Issues
    I bought this Sept 2017 with 134,000 miles on it. Body is in pristine condition and has all the service records from day one. Within the first 1,000 miles I was getting a MIL light and code P0128, so I switched out the thermostat. That seemed to solve that problem. This spring when the weather...
    downshift flashing mil high rpm loss engine power p0172
  4. OEM Issues
    I've been browsing this site for a few months now and finally decided to join. Special thanks to everyone who keeps posting. I have three error codes from my trailblazer: P1120, P1220 (throttle position sensor circuits 1 & 2) and P0172 (system too rich bank 1). I had gotten the P0172 code a...
    high idle p0172 sluggish acceleration throttle position sensor
  5. General
    Hello Everyone! I am having a nightmare with my 2003 Chevy Trailblazer. Here is the history of the current repair so I can get some advice from you FINE GENTS hopefully. OK, so I had the fuel pump bust a sending line the other day which dumped all the gas out and noticed it in a parking lot...
    ltft rich new fuel pump p0172 power loss
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