I started the truck today and ran fine, went to the mall to get a new phone. came out and started the truck and it had a weird whistle sond from under the hood. it gets higher with te revs, but goes away after 2000rpms. clear at idle but not super loud. I was thinking maybe I need a new belt. Its not a squeel, so maybe a pully? Any thoughts?
YouTube - weird sound
Alternator or Ac or pulley hard to tell from a video. I have replaced every pulley on mine and alt but now the AC is making noises when it is cold.
99RCSB Broke because I wasted thousands and thousands of dollars on my truck.
pcv valve in good? cant really tell.. a whistle is air moving to me... but that sounds like a bearing gettin burned up (in the fad not the bottom)
02 Sierra... motorless for now.
02 SS.. stock bottom 4.8, 241's, 224-220/116+4, 918's and pushrods, front mount turbonetics 78mm, HKS GTII, TiAL, eBoost2, Yank PT3600, Performabuilt 60e, solid motor mounts. Tuned by me with HP Pro and LM2/AFX
jeff from what i can tell i had sinilar noise and i think its youre alternator ready too **** the bed .sounds like its right there.
mods:2004 sierra ext sb,20s ,big brake kit w,hawk pads,air bagged,2006 6.0 lq4 swap,vortec supercharged10psi, air to water intercooled w/ dual electric fans on it ,snow meth injection kit,60lbers, e-fans ,big radiator swap ,cam 218 /222 548/550 comp .hardened prs .1.85 comp roller rockers ,guideplates ,crane double springs,trans 4l65e built .pacesetter l/ts true duals w/x pipe and magnaflows,14 bolt rearend swap ,3.73s,aroemotive fuel pump system w/elec.fuel controller and bypass regulator a/n fittings, taylor 10.5s interceptor gauge,aem w/b a/f ,autometer boost/vac NELSON 93 OCTANE TUNED .
dude thats no belt. thats a knock. your engine is screwed.
1951 3100
1984 C10
LOL at David.... are you stillJeff you shouldnt do that at the mall....
pull the fan belt off first and see if the noise is still there. Try turning the steering wheel to full left turn and then pull just a little more. Might be the P/S pump, too.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
good call red ,ya def pull the belt off and see if it goes away.let us know
mods:2004 sierra ext sb,20s ,big brake kit w,hawk pads,air bagged,2006 6.0 lq4 swap,vortec supercharged10psi, air to water intercooled w/ dual electric fans on it ,snow meth injection kit,60lbers, e-fans ,big radiator swap ,cam 218 /222 548/550 comp .hardened prs .1.85 comp roller rockers ,guideplates ,crane double springs,trans 4l65e built .pacesetter l/ts true duals w/x pipe and magnaflows,14 bolt rearend swap ,3.73s,aroemotive fuel pump system w/elec.fuel controller and bypass regulator a/n fittings, taylor 10.5s interceptor gauge,aem w/b a/f ,autometer boost/vac NELSON 93 OCTANE TUNED .
Might be the water pump
could be the belt tensioner too.. get you a long screw driver and use it as a stethoscope....
05 RC, LME 6.0, 243 Heads, LSA Rods, 11:25 Forged Pistons, Cam Motion Custom Grind, 4:10, Eaton LSD, Narrowed Rear-end w/ Chromoly Axles, Pacesetters LT's, SLP Loudmouth II Mufflers, Volant CAI, Yank SSTB3600, Bosch 42 lbs inj's, G-Force Tune, FLT Level 4 Trany, Belltech 2/4, Times: ?
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