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Classic/Antique Car Repair/Idle speed
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Question
I have an 1987 f150 5.0 liter,it is idling high,around 900 rpm.How can this be adjusted on a truck with EFI? Is there a problem with the idle air bypass? Possibly a vacuum leak?
The major problems that we have seen with idle on these engines is usually dirt in the throttle plate areas. Use carburetor cleaner and clean the area where the throttle plates close. If the engine still idles higher than normal use spray carburetor cleaner and check all of the places that could cause a vacuum leak with the engine running. You will hear it when you find a leak. Now, did this problem just happen? Did you change anything in the engine recently?
Brad
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Answers by Expert:
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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