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Engine sputtering, backfires and check engine light is blinking

Tiny
MYRICKS97
  • MEMBER
  • 2003 FORD F-150
  • 4.2L
  • V6
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
I have a truck that started sputtering and actually backfires in the front of the vehicle. The check engine light starts blinking when I push it to get up a hill. It’s been two days and haven’t driven it unless I had to, but any insight would be appreciated!
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Saturday, March 20th, 2021 AT 10:12 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I would start by checking the compression. Backfire and low power usually has something to do with one cylinder with low compression.

https://www.2carpros.com/articles/how-to-test-engine-compression

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/engine-backfires-while-running

You should have 140-160 pounds in each cylinder.

Roy
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Saturday, March 20th, 2021 AT 10:50 AM

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