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Isn't there a sensor in the drivers side cylinder head that is typically removed for installation of headers?
Maybe it wasn't reconnected or was damaged during the R&R?
Very front of driver's side head. #1 cyl. It's kind of fragile, and if bumped during install, could be broken. Take care when removing...do when engine is cool. Very easy to fix. OTOH, could just be unplugged.
Very front of driver's side head. #1 cyl. It's kind of fragile, and if bumped during install, could be broken. Take care when removing...do when engine is cool. Very easy to fix. OTOH, could just be unplugged.
Yup, I smashed mine and had to replace it putting in my long tubes.