sfbayjay
Well-Known Member
- Joined
- January 22, 2008
- Messages
- 107
- Reaction score
- 3
- City, State
- Cleveland-ish, OH
- Year, Model & Trim Level
- 2002 XLT SOHC 4L V6
Hi all,
Been struggling to pin down an issue under the hood of my 2002 XLT 4.0L V6.
Last week the large coolant hose that runs from the bottom of the coolant reservoir to the bottom of the radiator was CUT and started spewing coolant everywhere! Fun!
I found out that the belt tensioner, right next to the cut hose, is "jumping" when the truck was at idle, just enough to make contact with the hose and make a nice clean slice. This ONLY happens at idle - once engine speed is increased everything runs smoothly and the "jump" vanishes.
I have since replaced the hose, and also changed the belt (new Gatorback), the belt tensioner, and the idler pulley. Neither the tensioner or idler seemed in bad shape, but they were cheap and easy to swap so I crossed my fingers but, no dice - still jumping.
I've done a ton of reading about this here on the forum, but I can't seem to narrow down the problem. Too many possibilities: water pump, clutch fan, power steering pump/pulley, AC, harmonic balancer.
I don't have ANY chirp/squeak or noises with this problem, just the tensioner "jump" at idle - goes away and smooth as silk once RPMs are increased at all.
Here's a video I put together. Have a look and let me know if you have any thoughts on how to narrow down this problem! I really don't want to start throwing money at parts that don't need to be replaced if I can help it.
Link to Video: https://www.youtube.com/watch?v=g_H8hNqc
Been struggling to pin down an issue under the hood of my 2002 XLT 4.0L V6.
Last week the large coolant hose that runs from the bottom of the coolant reservoir to the bottom of the radiator was CUT and started spewing coolant everywhere! Fun!
I found out that the belt tensioner, right next to the cut hose, is "jumping" when the truck was at idle, just enough to make contact with the hose and make a nice clean slice. This ONLY happens at idle - once engine speed is increased everything runs smoothly and the "jump" vanishes.
I have since replaced the hose, and also changed the belt (new Gatorback), the belt tensioner, and the idler pulley. Neither the tensioner or idler seemed in bad shape, but they were cheap and easy to swap so I crossed my fingers but, no dice - still jumping.
I've done a ton of reading about this here on the forum, but I can't seem to narrow down the problem. Too many possibilities: water pump, clutch fan, power steering pump/pulley, AC, harmonic balancer.
I don't have ANY chirp/squeak or noises with this problem, just the tensioner "jump" at idle - goes away and smooth as silk once RPMs are increased at all.
Here's a video I put together. Have a look and let me know if you have any thoughts on how to narrow down this problem! I really don't want to start throwing money at parts that don't need to be replaced if I can help it.
Link to Video: https://www.youtube.com/watch?v=g_H8hNqc