Turbo lag or surge on my JCB intake or sensor?

Yellowiron

New member
Joined
Dec 27, 2025
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3
My JCB has been acting a bit jumpy lately, there’s turbo lag, and then it surges like it’s on a caffeine rush.
I’m trying to figure out if it’s an intake restriction, a cranky sensor, or something else entirely.

What’s actually worked for you to fix this without having to do a complete engine teardown?
 
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