Throttle body

JOHN MIANO

MEMBER
1989 FORD F-250
7.5L
V8
2WD
AUTOMATIC
250,000 MILES

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.

Tuesday, May 9th, 2017 AT 6:57 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,840 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

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Thursday, May 11th, 2017 AT 11:37 AM

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?

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Friday, May 12th, 2017 AT 5:12 PM

KEN L

MASTER CERTIFIED MECHANIC
42,840 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

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Friday, May 12th, 2017 AT 7:38 PM