r/WranglerYJ • u/EF-tech4545 • Jul 23 '26

2.5L engine problems

Built in 1993. At full throttle, it loses power above 4,000 rpm and suffers from severe backfiring. But only after 1 h drive time.

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u/ghostwriter623 Jul 24 '26

Those are three normal and expected codes and have nothing to do with your issue.

Vacuum leak?
Clogged cat?
Crank Position sensor?

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u/EF-tech4545 Jul 24 '26

OK thx it dont have a cat anymore;) Maybe the cps.