Engine sputtering, backfires and check engine light is blinking

2003 FORD F-150
156,000 MILES • 4.2L • V6 • 2WD • AUTOMATIC
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MYRICKS97
  • MEMBER
  • 1 POST
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!
Mar 20, 2021 at 3:12 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
Mar 20, 2021 at 3:50 AM
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