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Chevy Blazer GMC Jimmy Maintenance and Repair



  • After I start up the engine a high pitched whine begins coming from the rear-end of the vehicle. ANy ideas?
  • alcanalcan Posts: 2,550
    Fuel pump.
  • Did you ever get the problem fixed? I am working on a 1995 GMC Jimmy with 118,000 mile and the same problem?
  • i have been trying to get the starter out it is unhooked ,but i cannot get it out is there a trick?
  • Debby,
    It is a vacuum-control system. I would check the vacuum connections first. Open the hood, and look at the upper-middle area of the firewall (above the distributor cap). there is a part there with two small nipples connecting vacuum hoses. I had one of the nipples break off. I super-glued it back on and the system worked fine. It could be that or those hoses.
  • alcanalcan Posts: 2,550
    Engine? 2WD, 4x4?
  • thanks anyway i had to take off all the hoses that were in the way
  • bill81bill81 Posts: 2
    I have the same problem with a '97 blazer and I am stumped...I do not see the solution to this problem?
  • bill81bill81 Posts: 2
    Lowrider, did you find a solution?
  • Those of you who have 99 and up GMC Jimmys or Blazers know that the rear defrost is in part powered by two wires that hang from the top of the rear gate to the rear window. Recently, one of the wires came loose from the rear window. So in effect, I just have one of the wires hanging from the top of the rear gate. It looks like some sort of glue kept it up to the window. When I press the part that seperated from the window there seems to be an electrical spark. Does anyone know if it is OK to simply superglue or apply some sort of adhesive to this end to make it stick back on the window? will it affect the defrost capabilities? or should I take it in to have something like this fixed professionally?
  • alcanalcan Posts: 2,550
    Super glue won't do it, it'll cause a high resistance connection. Permatex and I think Loctite make adhesives specifically for that application. Should be available at any half decent parts outlet. Or drop into any windshield shop, they should have the right adhesive.
  • We've checked the fuel pump pressure it was over 50, there's no sign of any leaks in the gas lines, but it seems like its not getting any gas. When gas is poured directly into the carburetor it starts right off and runs until that gas is gone then dies. Then when we try to start it again it pops right off and runs fine. We just can't figure out what the problem is after the pressure valve since we know the gas is atleast getting that far. I'm afraid to drive it for fear of being stranded, so any suggestions you have would be greatly appreciated.
  • I have a 95 gmc jimmy with the 4.3 vortec and it sounds like the same problem i was having. My gas milage was cut in half, Smell of gas, rough idle,chugging on takeoff, backfires, black stuff out the exhaust, intermittent service engine light that drove me nuts.... I replaced several of the components you had with no fix either. Finally I found out that the fuel injector unit went bad, but only half of it. It fired on 3 cylinders and ran but not very well. I did'nt know that the injector units in the vortecs have a line to each of the cylinders, and that those individul lines can go bad causing a misfire on that particular cylinder. If when you changed your plugs if a few of them were white and looked to be firing while the others were black (not-firing). This may be the cause of your problems, I also changed out the O2 sensor at the same time as the injector unit, because of all the crap that was blown though from the misfireing cylinders. The unit was not cheep around $400 the O2 was around $50 but Runs better now than when i bought it used, i hope to get that money back in made up gas milage. Im not sure but you might look into this on yours it made mine run great after i replaced it.
  • I have a '99 GMC Jimmy 4x4. My 4WD was not working. The light would flash but not engage. I took it to a transmission shop who changed the motor in the transfer case. Now the problem is the 4WD lights on the dash do not light and the Service 4WD light now appears. I went the dealer to have the transfer case re-programmed using the OTC3628 "tech 2." The dealer said they could not because a Diagnostic Trouble Code C0308 could not be cleared. Now the dealer says they need to do more analysis. Sounds like "big bucks" to me. Any idea what the DTC is and what else might be able to be done? Thanks
  • I have a 1999 Chevy Blazer LS 4x4 and when im driving down the road the truck shifts into 4 wheel drive by itself and when i put it back into 2wd it will wait for about a minute and go back into 4wd. this is my first 4wd vehicle and i have no clue why it is doing this.
  • Please, help. I have a 95 Blazer with composite (not sealed beam) headlights. Need to replace the low beam, but can't figure how to get to it. The high beam bulbs are easily accessible, but I have to do the low beam.
    Thanks for any help.
  • alcanalcan Posts: 2,550
    GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide
    1994-95 MODELS

    1. Disconnect the negative battery cable.
    2. If replacing the right side bulb, remove the battery from the vehicle.
    3. If replacing the left side bulb, remove the intake air box.
    4. Remove the grille from the front of the vehicle.
    5. Remove the retaining screw from the engine side of the radiator support, then remove the headlight capsule-to-radiator support screws.
    6. Pull the composite headlight assembly forward slightly, then unplug the headlamp and side marker lamp wiring connectors.
    7. Remove the headlight assembly from the vehicle. Remove the necessary bulb(s) from the assembly.
  • Thanks. I think I'll try it this weekend, when I have a couple of hours, and I'll let you know how it goes. You know, I was looking in my Haynes manual and there are two sections about this. The one I was looking at is called Headlight-replacement, which covers sealed beam-type and composite-type, and never mentions removing the radiator grille. The second section called Composite headlight housing-removal and installation coincides pretty well with what you sent.
    P.S. Could GM have made this much harder?
  • Hi, I'm new to this forum. I have a 2000 Chevy Blazer that is making a low rumbling noise when I approach 30 mph. What do you think? Thanks
  • gregb9gregb9 Posts: 2
    I am a first responder and am trying to get headlight flashers installed in my 2000 GMC Jimmy. They are manufactured by Brooking Industries and are model BR910-EZ.
    I took the car to the GMC dealer to have them installed and there stumped. When the switched is turned on the high beams come on but do not flash. Any suggestions????
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