My buddy has a 6.0l LQ4 in his 04 Hummer H2. It has a surge around 1500 RPM and jumps to about 1700 rpm every few seconds. Speed is not a factor just RPM... no codes.
If his foot is in the throttle it goes away... just does it at cruise.
Thoughts??
My buddy has a 6.0l LQ4 in his 04 Hummer H2. It has a surge around 1500 RPM and jumps to about 1700 rpm every few seconds. Speed is not a factor just RPM... no codes.
If his foot is in the throttle it goes away... just does it at cruise.
Thoughts??
anyone?
nope, i was gunna say something about the idle but its not at idle.
Almost sounds like O2 switching from lean to rich (doubt it) , or could be A/C trigging timing , vacuum leak any number of things .Originally Posted by Muddydawg75
Last edited by Chevy366; 07-04-2008 at 12:49 PM.
Now what is a tune again?
Comp Cam 54-412-11 , Int:265, 212, .522 , Exh: 271, 218, .529 , LSA 114 , Longtube , CAI (Vararam) , TransGo HD2 shift kit , tuned by me with EFILive
Sounds like the torque converter acting up, mine does the samething in my 02 6.0L Denali and I am almost positive its the torque converter
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