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Ford Truck Club Forum > FORD BRONCO | BRONCO II > 1987-1991 Ford Bronco



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  #11  
Old July 22nd, 2014, 04:25 PM
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maybe I'm missing something
how can the smoke come OUT were a vacuum leak is


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  #12  
Old July 22nd, 2014, 07:10 PM
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Because the engine is NOT running during this test.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


  #13  
Old July 22nd, 2014, 08:20 PM
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once again


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  #14  
Old July 23rd, 2014, 01:18 AM
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A vacuum leak is a leak to the outside air, in the intake portion of then engine. When the engine is running, the vacuum that the engine creates pulls air through one of those holes. During this test, you seal off the TB by putting the gloves over the holes. Remember you are doing this test without the engine running, so there is no vacuum. Essentially, you are filling the intake portion (intake manifold, throttle body, even the crank case because of the PCV system) with smoke. Once it is filled with smoke and you blow more smoke in, the smoke is going to come out of that hole (vacuum leak).

A vacuum leak is a 2 way street, air can get sucked in or smoke\air\whatever can get blown out. Basic idea is here:

https://www.youtube.com/watch?v=zMok2y05jNE


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


  #15  
Old November 15th, 2014, 03:24 PM
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Ksoko, Booba5185,

What the heck is an IAC valve? Where is it and how do I clean it?
  #16  
Old November 15th, 2014, 08:58 PM
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Idle Air Control valve.



It's mounted on the throttle body. Remove it and spray it out with WD-40 and use a small screwdriver to carefully work the plunger till it's free. Spray it out again then blast it with compressed air to get the excess WD-40 out. New ones are about 50 bucks.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #17  
Old November 15th, 2014, 09:08 PM
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Just put a new one on about a month ago when I was replacing everything else trying to figure out what was wrong. When I bought it, it was called something else.


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