Removing air ducting on a 1999 GMC Jimmy or Chevy Blazer.
Engine Access:

Removing Air Ducting On A
1999 GMC Jimmy or Chevy Blazer
With A 4.3 Liter V6 Engine


In This Article:

A few fasteners are removed, a band clamp is loosened, a vacuum tube removed and some electrical connectors are unplugged. The air ducting is separated and removed from the car.

Related Articles - 1999 Jimmy/Blazer:

Skill Level: 2 (Basic) Time Taken: About 5 Minutes

By Bruce W. Maki, Editor


Working on the engine in a Chevy Blazer or GMC Jimmy often requires removing the air ducting to reach parts on top of the engine.

Removing the air ducting is straightforward and only requires a few tools.

Intake air ducting, 1999 GMC Jimmy or Chevy Blazer


  • Wing-nut A needs to be removed. This can be done by hand.
  • Band clamp B needs to be loosened with a 5/16" nutdriver.
  • Four screws (C) that secure the cover for the air filter need to be unscrewed. A large (#3) Phillips screwdriver works well, but these can also be removed by hand.


Viewed from the driver's side of the car, these items need to be disconnected:

  • Two electrical connectors (D)
  • A cable clamp (E), which can be opened with a small screwdriver.
  • A vacuum hose (F). This just pulls off.
Electrical connections on air duct, Jimmy/Blazer.


Loosening air duct band clamp.

I loosened this band clamp with a 5/16" socket and ratchet.

It makes more sense to use a 5/16" nutdriver, but I didn't have one handy.


When removing this part of the air ducting, it must be lifted at the back and rotated upwards.

There are a pair of prongs under the front edge that grab the throttle body.

Removing intake air duct, Jimmy or Blazer.


Removing electrical connectors, GM truck.

I removed two electrical connectors on the flexible rubber duct.


After I loosened the 4 screws on the air filter box, I removed this section of duct.

Removing intake air duct, 99 GMC Jimmy or Blazer.


Throttle body on 4.3 V6 engine, GM truck.

Once the ducting is removed, the throttle body (the circular thing in the middle of the picture) can be reached.



I periodically spray some carburator cleaner into the throttle body, to dissolve the black gunk that builds up and makes the gas pedal stick.

Note that the engine may not run properly with the air duct removed, because the mass air flow sensor does not send the proper signal to the engine computer. I can usually get the engine to run by opening up the throttle by hand.


When replacing the air duct, I first install the the black plastic "horn" shown above. Then I slip the flexible rubber duct over the horn and position the air filter cover over the air filter box.

It seems that I always struggle with the four bolts that secure the air filter cover to the filter box because the threads don't engage easily. My suggestion is to:

1) make sure the filter cover is seated over the box,

2) make sure each bolt is vertical before screwing it in,

3) get each bolt started before fully tightening any bolts,

4) use a #3 Phillips screwdriver to tighten each bolt.


More Info:

Tools Used:

  • 5/16" Nutdriver or Socket and Ratchet
  • #3 Phillips Screwdriver
  • Small Flat Screwdriver

Materials Used:

  • None

Related Articles:






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Written January 6, 2009