Hesitation with throttle

1990 FORD F-150
188,000 MILES • 5.0L • V8 • 4WD • AUTOMATIC
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CWJR
  • MEMBER
  • 3 POSTS
I replaced a new timing chain with gears, a fuel pump, the distributor, oil change, spark plugs and wires, idle position sensor, throttle position sensor, and the air charge temperature sensor. Still does not change the fact that when I accelerate the truck to the next gear or from park to drive or reverse the truck wants to slow down and shut off. Shifts through gears fine but when I accelerate from gear to gear it hesitates. I can not seem to find the problem?
Feb 27, 2019 at 5:33 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

Wow, a lot of parts with no results.

https://www.2carpros.com/articles/engine-hesitates

I would start by having the back pressure tested on the cat converters to be sure the exhaust is not restricted.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Also, The injectors may also be the issue. I would have them professionally cleaned. Additives have no effect on cleaning.

Are there any codes set?

Roy

Apr 6, 2021 at 5:47 AM
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CWJR
  • MEMBER
  • 3 POSTS
No codes. The check engine light isn't even on.
Apr 6, 2021 at 5:47 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Okay, I would check the two items I listed to be sure they are not the issue.

Roy
Apr 6, 2021 at 5:47 AM
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CWJR
  • MEMBER
  • 3 POSTS
I will. And thank you.
Apr 6, 2021 at 5:47 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
You are welcome.

Always glad to help.

Roy
Apr 6, 2021 at 5:47 AM
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