Weird Whine
#1
JK Newbie
Thread Starter
Join Date: Nov 2016
Location: Huntsville, AL
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
Weird Whine
2009 JKU, 37" tires, 4.88s, ARB snorkel intake kit, 3.8 auto. When the engine appears to be under higher torque (turning and going up an incline), I get this mid-pitched whine. Not like an alternator going out. It almost sounds like an older riding lawn mower when letting off the clutch/brake and the blades are spinning and the belt is slipping along the pulleys a bit. It is hard to explain. But it is only when I am accelerating and beginning an ascent (climb) regardless of steepness. And it is only brief and fades, not a drastic stop. I've owned the jeep for going on three years, but I have not modified the engine/transmission/transfer. It has had a G2 Core 44 front end for two years. Did it in reverse today on an incline too.
Last edited by BIG BLU; 12-20-2016 at 05:50 PM.
#3
JK Newbie
2009 JKU, 37" tires, 4.88s, ARB snorkel intake kit. When the engine appears to be under higher torque (turning and going up an incline), I get this mid-pitched whine. Not like an alternator going out. It almost sounds like an older riding lawn mower when letting off the clutch/brake and the blades are spinning and the belt is slipping along the pulleys a bit. It is hard to explain. But it is only when I am accelerating and beginning an ascent (climb) regardless of steepness. And it is only brief and fades, not a drastic stop. I've owne the jeep for going on three years, but I have not modified the engine/transmission/transfer. It has had a G2 Core 44 front end for two years.
#5
JK Newbie
Thread Starter
Join Date: Nov 2016
Location: Huntsville, AL
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
#6
JK Newbie
Thread Starter
Join Date: Nov 2016
Location: Huntsville, AL
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
3.8 auto. No slipping or jerking in the transmission accompanying the whine. I am wondering if the serpentine belt is just worn and too slick and slipping. Tension seems good, and I didn't see any dry rot or cracking.
#7
JK Newbie
I would check the belt and belt tensioner. Also, not familiar with the 3.8, but could possibly be coming from an bad bearing in the idler pulley, but most of the ones I've seen go bad have a grinding noise coming from them. A bad tensioner could cause belt slippage and the squeaking.
Last edited by lucky5; 12-20-2016 at 06:19 PM.
Trending Topics
#8
JK Newbie
Thread Starter
Join Date: Nov 2016
Location: Huntsville, AL
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
I would check the belt and belt tensioner. Also, not familiar with the 3.8, but could possibly be coming from an bad bearing in the idler pulley, but most of the ones I've seen go bad have a grinding noise coming from them. A bad tensioner could cause belt slippage and the squeaking.
#9
JK Newbie
Crown Automotive 53032860AA Belt Tensioner for 07-10 Jeep® Wrangler & Wrangler Unlimited JK with 3.8L V6 Engine | Quadratec
Here is a list of common engine torque values for the 3.8L.
Jeep Wrangler JK Engine Torque Specs | ExtremeTerrain
Last edited by lucky5; 12-21-2016 at 08:54 PM. Reason: added torque specs link.