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Chevy Blazer GMC Jimmy Maintenance and Repair



  • I have a 95 Blazer with 185000 miles on the original Vortec V-6. Lately I have noticed the engine running poorly after it gets warmed up. I just changed the plugs, wires,cap rotor and O2 sensor. None of this seems to have helped. When you first start the engine, it runs as smooth as the day it was built. After about 30 minutes, the miss starts. I have also noticed a significant drop in fuel mileage as well. Any ides?
  • rallanrallan Posts: 10
    I have a 1998 Blazer that will not go into 4hi or 4 lo.
    I can hear the relays engaging and the lights flicker but am not getting voltage to the encoder motor when 4hi or 4lo is pressed.I can disconnect the harness from the encoder and apply voltage to activate the encoder and shift into 4hi. The 4hi light is then lit but will not shift out of 4hi to 2hi without "hotwiring" the encoder.Did not try 4lo.
    Tried replacing the TCCM but same problem.
    The harness from the TCCM to the encoder checks out OK with an OHM meter.
    Not sure what to do next. Anyone have an idea?
  • rallanrallan Posts: 10
    I have seen this problem before on other vehicles.
    Try Changing the Ignition coil.
  • what did you end up doing? I've got the same thing happening....
  • well, sorry it took me so long to send this. Like you said repairdog, I got the dealer to change my fan clutch( because of the heavy blowing), That has fixed it, no more blowing, and the power has came back. I went and had them to flush cooling system and put fresh dex in it.. blazer is running great now. Next Id guess, complete tune up seeing it has 118,671 on it. And I dont have a clue if any maintence has been done.But, so far, I havent had any of the major problems yet.( maybe they have been done before I got it)( fingers,toes and hair crossed)
    The only thing is I havent been able to get the 4x4 worked on yet.
    One question I have is, I dnt have a clue if this has ever been done , but, at this mileage, would a transmission fluid and filter change, be good or bad for it? I've heard the horror stories about getting this done on a GM after 100,000 for the first time. And the thing burn up.

    Oh,is case you forgot, I have a 2000 blazer LS 4x4 :D :)
  • I recently had the same problem with my 97 jimmy
    i know it sounds simple and if it is what the problem is youll kick yourself for not trying it
    but look in fuce box i think if its the same as the 97 it will be number 19 and its a 20 fuse yellow
    replace it and see if that helps
  • on my 97 im not sure if it was ever done befor but when i bought it with 115k i had the tranny flushed and it was great then at about 134k i had to have the 2-3 cylanoid in the tranny replace so they flushed it then droped the pan drained it replace the 2-3 downshift and then filled back up
    no problems
    i have 143k now
  • just had this problem fixed, a seal between the transfer case and tranny went pumping fluid into the transfer case and overflowing through the breather(vent). $300-400 to fix by someone who knows what there doing.
  • rallanrallan Posts: 10
    Under the hood there is a fuse box. In the middle row next to the relay closest to the firewall there is a 20 Amp fuse which is labeled "ATC" on the diagram. I replaced it and now my Blazer will shift in/out of 4WD just fine.
    So GM uses 2 fuses for the system, one for the CPU at the fuse pannel to the side of the dash and one for the electric motor under the hood.
  • I have a 95 chevy blazer and my turn signal and hazard lights won't come on. I went to autozone they gave me a big round plug. They said it goes under the driver side under where the pedals are. I took the panel off I did not see anything. Did they give me the wrong piece, because I looked where you said and I seen two square plugs there. which one do I need?
  • Just recently my 91 Blazer we used for fishing trips was taken on a joy-ride and then vandalized..[dash and 4-wheel indicators smashed]..I have made some basic repairs to get it mobile again,,but now the front axle wont engage..since we only use 4-low anyway,,does anyone know of a simple way to engage the front axle[I,m thinking its an electrical problem as the wiring on the selector indicator was damaged]..?
  • Hey ,
    On the way to work today my "service engine soon" light cameon and stayed on. What is this? Is it telling me its time for a tune up? :confuse:
  • I would go to autozone and have your codes checked for malfunctions.
  • I went to advance, they checked it, it was a evap leak, prob gas cap, they cut it off, and I redid cap tightly and drove all day and it didnt come back on
  • I also have a 93 Jimmy with the same prob. Did you ever get it resolved? If yes what was it?
  • rallanrallan Posts: 10
    Try pulling on the release and have another person push down on the hood at the same time. If it opens then you need to adjust the latch or stops
  • rallanrallan Posts: 10
    Check the dash light potientometer (the switch that adjust the brightness of the dash lights)
  • I checked the dimmer pot. That wasn´t it. I have the digital display. The Speedometer stays lit. Just the coolant,fuel,oil pres,voltage,and tach don´t light up. any other tips?
  • The heater core went out on my 2000 Jimmy. It is currently disconnected, but I need to fix it soon. I have talked with some folks that suggest replacing the heater core THROUGH the fire wall. Has anyone tried this on a Jimmy?? Thanks in advance.
  • I had to replace the Heater Core in my '97 Blazer, and had to take the dash off to gain access.
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