Serpentine squeal diagnostic

K

KevinMascorro

Member
Location
Michigan
Name
Kevin
https://vimeo.com/102219486

I've just recently encountered this problem. At first I only noticed it when I down shifted to hear my new invidia pipes. I only heard it when the rpms are going back down. But now it's happening at start up for a half minute. I tried the water test and got the underside of the belt wet when running but nothing happened. My guess is that one of the pulleys is moving faster then the rest and the different speeds causes the squeal? College student trying to save money. Should I replace the belt and go from there? Or should I get a heavier harmonic balancer.

Fx35 2004 205,838 miles engine has around 95,000 miles.
 
The belt just needs to be tightened. Mine was squealing for awhile and i got it tightened and fixed. The belt needs to be tighter then most think. It took my cousin 2 minutes to tighten the belt, you can do it from the top if you know where the bolt is
 
I just had my friend look around. He says the noise is actually coming from the exhaust. I've done a few things to my stock exhaust in an attempt to remove that horrible rattle the fx's produce. I have invidia test pipe. So I do not have cats. I cut the heat shields. Got new resonators. And replaced my muffler with a scrap yard fx muffler, r.i.p. Everything else is stock. The squeal (In the video) is the new noise I'm currently after. He thinks it's a lot of back pressure getting sucked back up. Any opinions on my next step? Or any exhaust shops near Houston.
 
Check your belt tension, if it's happening for 30 seconds on startup, it's most likely your belt. Belts squeal when cold if they're not tight enough or maybe old.

Your friend's theory is just weird. No such thing as back pressure, it's a term referring to exhaust velocity and scavenging. So you can't suck up "backpressure". The only noise you would hear from your exhaust would be potential leaks which don't sound like squeal. And you may also hear rasp since you're running test pipes with stock exhaust. That would cause a noise upon decel, but it sounds nothing like squeal.

And unless one of your pulleys is failing or your belt is loose, all the pulleys spin at the same speed. Only the crank pulley is powered, all the other ones just spin. That's why the belts are there, to drive the alternator, AC compressor and such. If one of your pulleys was failing or sticking, your belt would fail pretty quickly as well.
 
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