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Classic/Antique Car Repair/idle 2000 gt mustang 4.6

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Expert: - 11/17/2008


Question
my 2000 gt mustang 4.6,runs an idles normally,when you turn on the heater or the air condition,then the idle goes up an down an will try to cut off when sitting still.as soon as you cut the heat or air off the idle is fine.have any idea whats causing that.thanks  ronnie  

Answer
You are going to have to get into the computer operation and the sensors on this one. When you throw a load on the engine like the A/C the computer sensor read the load. It then askes the computer to increase throttle opeing by opening an air valve to increase engines power. Some where along this line there is a glitch. It could be as simple as cleaning the throat of the ar intake where the throttle valves are or getting a scanner on the system to check the sensors and the computer.
Brad

Classic/Antique Car Repair

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Brad Sears

Expertise

All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.

Experience

Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

Education/Credentials
More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

Awards and Honors
Moto Award winner. And much more.

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