Misfire at 3k rpm, Help! - Page 2

FlukeSS · 12-14-2024, 09:19 AM

Quote:

Originally Posted by SomeGeoffGuy

Fluke - did you do a crank sensor re-learn? Whenever I hear someone having higher RPM breakups that is the first thing I think of. That was always a thing on the LS engines. Not sure if the LT engines are the same.

-Geoff

Not sure to be honest. I'll have to ask my tuner if it is applicable in LT1's

bishopts · 12-18-2024, 11:56 PM

i had this same problem. turns out if you run out 3rd gear while not paying attention to your rpms... you float valves and bend them. simple compression test showed it. im on a stock engine with a tune so i just replaced the head from GM. it was $348 with new valves in it. i damn near got 2 more just to have but figured i would hold off on it. head gasket set, new bolts and 4 hours in the shop with a friend and its all back to normal.

12-18-2024, 11:56 PM	#16
bishopts Drives: 2017 2ss 6mt Join Date: Mar 2024 Location: dallas Posts: 941	i had this same problem. turns out if you run out 3rd gear while not paying attention to your rpms... you float valves and bend them. simple compression test showed it. im on a stock engine with a tune so i just replaced the head from GM. it was $348 with new valves in it. i damn near got 2 more just to have but figured i would hold off on it. head gasket set, new bolts and 4 hours in the shop with a friend and its all back to normal.

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