It seems to happen when a/c on?
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2003 GMC Yukon Denali Question: I have a fluttering sound from the motor upon accelorating?
need more info. poss belt or tensioner noise?
Replykmullen, July 19, 2012, 09:17Rookie
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 #2Hyedegha July 19, 2012, 09:22Technician
Could be in the lifters need to get it inspected.
Answer #3ziptie12 July 19, 2012, 10:27Master
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.
Replykmullen, July 19, 2012, 11:58Rookie
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,
Replyziptie12, July 19, 2012, 13:01Master
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.