I have a fluttering sound from the motor upon accelorating? on 2003 GMC Yukon Denali

It seems to happen when a/c on?

by in Olathe, KS on July 19, 2012
3 answers 3 comments
ANSWER by on July 19, 2012
need more info. poss belt or tensioner noise?
COMMENT by on July 19, 2012
No just seems to happen when a/c is running? I hear just a fluttering noise? Hard to explain but engine rpm gauge is normal?
ANSWER by on July 19, 2012
Could be in the lifters need to get it inspected.
ANSWER by on July 19, 2012
To reiterate what globalhelper said in answer #1....BELT or TENSIONER . Get someone in the vehicle to turn the A/C on and off while you watch the accessory drive belt. When the A/C is turned on , your increasing the load on that belt IF the TENSIONER OR BELT are worn past there usable life expectancy (yes , both would be considered normal wear items), you will see and most likely hear the noise you're describing.Watch and see if the tensioner is vibrating back and forth rapidly , matching the 'fluttering' sound you're hearing.IF the noise is a knocking or ticking then we're in a whole different ballpark. Good luck.
COMMENT by on July 19, 2012
The sound is hard to explain. It is not a knocking or ticking sound it just sounds like a flubbering sound? Thanks for your comments, KM.
COMMENT by on July 19, 2012
Has anyone done a visual inspection as mentioned priorly? What did they notice?................7/25..been thinking about the 'flubbering. If not fixed already ..the A/C compressor could make that sound. Yes I understand , sounds are sometimes hard to explain.