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Chevy S10 - GMC S15 and Sonoma Engine and Underhood Problems



  • giakamogiakamo Posts: 4
    ok update.. wires did not fix problem. should I be expecting to replace the injector, or the spider? and does anyone know where the poppet valve is ?
  • i have a 2003 chevys10 4.3l vin x . on a hard up hill pull kicked down into 2nd gear the check engine begins to flash and it feels like its holding back, if you let off the throttle a little bit it seems to be ok but the light flashes for a little bit when i check the codes its usually misfire 5 or 6..all the tune up stuff has been done. at idle it seems to have alittle bounced to it. going to check fuel pressure tomorrow at work.thanks in advance for any help
  • Hello. I have a 2001 Sonoma :lemon: that will not start. It seems to have problems when its damp outside or if i dont drive it for the weekend. Come monday it will not start. So today..monday.. i go to start it and all it does is turn over and thats it...or it tries to start backwards...ive got it to start every time it has done this but this is the worst its ever been. Ive tried jumping it... it has a brand new battery, not even a month old! my dad recently put new plugs and wires in it also. this truck hasnt even seen 98,000 miles yet! its also has a new cat that probably a little over a year old now.. no one can really seem to figure out whats wrong! HELP! thanks for your time... :) P.S. its a V6 automatic if that helps at all.
  • butch31butch31 Posts: 1
    i have a 1997 gmc sonoma 4.3 vin x it only misses on #1&2 cyl only . i thought it was the engibe, so i put a good one in and stll misses on 1&2 cyl, changed computer plugs, wires . injecters and pretty much everything under the hood and STILL misses on 1&2 cyl.....HELP!!!!!!

  • gonogogonogo Posts: 869
    Intake leak, head gasket leak.
  • 1996 GMC Sonoma 4.3 V6 5sp manual trans.
    At 3/4 to WOT throttle the vehicle surges/bucks and is not making the power it should.
    No codes, runs fine other wise.
    Also yesterday while stuck in traffic it appeard to become stuck on high idle at 1900rpm, pushing the vehicle along and idleing at 1900 at stop lights.
    After sitting 2 hours was back to normal.
    Again no codes.
  • Hi Guys...I have a 2000 GMC sonoma flex fuel truck and i keep getting 2 codes Po179 and one for transmission slippage but after reading it all points to the flex fuel sensor located on the chassis under the ac unit on the passenger side question is can i change some stuff to get this back to just a regular gas vehicle and what would it take to do this ..........same chocolate truck on learnmore page

  • gonogogonogo Posts: 869
    If you google around I think you will find a unit a lot cheaper then the factory one, it will let you run just gasoline.
  • wmwinkwmwink Posts: 1
    Can a bad MAF sensor give me the P0300 Code? The Service engine light comes on and stays on for a few days then goes off for a few days. The truck memory shows the misfire code. When light is on I get a MAF code as well. Where is this part located at on the truck? Thanks for any input as I am wanting to sell this truck but want it fixed first
  • I have a 95 4.3 vortec vin code Z and when I accelerate my motor bogs down to the point it almost shuts off. My fuel gauge and battery gauge go haywire unless i barely touch the gas then it goes fine. I cannot find a posting that specifies this particular motor....any ideas? I have replaced the fuel pressure regulator because an old guy at the parts store recommended that may be the problem.
  • pepppepp Posts: 1
    It is most likely the heater core ,i would almost bet. :D
  • I'm looking for a diagram that will show me that I have all the fuel injection lines in there right ports, there are 2 that possably could be crossed. I have a slight vibration to the car....hard to tell if its drive train or what but my therory is crossed line could cause a minor missfire.
  • Passenger side... middle tube goes to the far back port, tube farthest back on your injector goes to the middle port, and tube the closest to the front of the vehicle on the injector goes to the port at the front. Drivers side... back tube to back port, middle tube to middle port, and front tube to front port.
  • Thx...hopefully I got it wrong and this will make it better.
  • does anybody know where i can find a heater vacuum line diagram for my 95 gmc sonoma,
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