VACUUM LEAK AT POINT OF SHIFT

  • Tiny
  • mitchellbaughman
  • 1992 Ford F-150
  • 128,000 miles

The engine is a 4.9 straight 6. I have a leak that sounds like a "turbo" a "shhhhwwwwsssshhhh" sound only heard when the tranny shifts while accelerating. I have replaced all visible vacuum lines which leads me to believe that it is maybe a manifold leak. I have sprayed at least a couple cans of carb cleaner under the hood to try to locate this leak also. The exhaust also smells "fume-y" like it is running rich. I have replaced all the regular maintenance parts including O2 sensor and temp sensor. Any Ideas?

Tuesday, October 2nd, 2012 AT 12:57 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 41,680 posts

I'm sending a chart and you can check if you have ppower brakes it may be your vacuum booster or a hose inside for your heater controls. If you ahve sparayed everything underhood and foun dnothing then I doubt it's there.

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Tuesday, October 2nd, 2012 AT 1:56 PM

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