Throttle body

1989 FORD F-250
250,000 MILES • 7.5L • V8 • 2WD • AUTOMATIC
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JOHN MIANO
  • MEMBER
  • 4 POSTS
I need the Initial throttle plate open setting in stop screw turns or thousands of an inch. I moved the throttle plate stop screw prior to getting an answer on idle speed adjustment.
May 8, 2017 at 11:57 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,554 POSTS
Hi John,

Love the little dog, you want to put the screw inward just enough to crack open the throttle plate just off closed and you will be all set.

Please let us know what happens.

Cheers, Ken

May 11, 2017 at 4:37 AM
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JOHN MIANO
  • MEMBER
  • 4 POSTS
Ken,

It still idles too slow. I replaced the Throttle Position Sensor and the Idle Air Bypass Control, no improvement. Is there some trick to Adjusting the Idle Speed Upward to 650 to 700RPM without moving the Throttle Plate Stop Screw?
May 12, 2017 at 10:12 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,554 POSTS
No not really it will set a check engine light. BTW can you run the codes to see if there are any?

Here is a guide to help you

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval

Please run this test and get back to us so we can continue helping you.

Cheers, Ken
May 12, 2017 at 12:38 PM
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