Mitsumotors

I installed a custom tune from vmp on my truck a few weeks ago and I immediately noticed when I would step on it the serpentine belt would squeal when shifting from first to second at high rpm. I figured it must be a worn belt and replaced it but the problem hasn't gone away. Has anyone else experienced anything like this?

BassAckwards

It might be the idler pulley or the tensioner pulley has bearings going out. It's not the tune that did it though I can promise you that.

Blake Howell

I have edge evo on mine and it does it too. I sprayed belt conditioner on mine it still does it. Idk but if anyone does I would like to know .

kevhead75

I wouldn't spray any belt conditioner on it. That is about the worst thing you can do. Get a new belt, preferably a goodyear gatorback. They seem to be the best belt out there.

06screwlariat

I have the edge evo and from 1-2 under full throttle it sometimes does it, wasn't too worried, our 1969 mustang does it and it keeps doing it for about 4 seconds after the shift. I always thought it was the belt.

08F-150

My truck does that too it's because the rpm changes so fast between shifts and shifts hard and causes the belt to slip a little bit, mines done it for the last 50,000km my evo tuner been installed

madeSICC

mine does it too, only when WOT though.

Blake Howell

So solutions are get new belt that won't slip as easily or keep on riding?

madeSICC

my solution is to not floor it. saves me lots of money in gas and breaking parts

Blake Howell

Ha true just can't back down from a 4.8