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i've had a ticking noise in my tahoe for awhile. i can't seem to figure out what it is. so far i have swapped lifters and heads (did the heads just to lower compression) swapped all the push rods from one side of the motor to the other along with the rockers. that didn't help. the tick is always on the same side. it gets louder with a load on the motor. knowing this i pulled the coil pack wires one at a time to see if the noise would go away, and it didn't. also heads have new springs and seals. could this be the oil pump making noise? sometime it seems like its at the front of the motor but its hard to tell. after you listen for so long it all blends together lol. but you can definitely tell its not on the driver side. but the alternator is kinda in the way of sound when you move to the driver side, if it were in the front.
hard to explain. i jope some of this makes since.
here is a vid from the beginning before i swapped lifters.
This might sound really crazy but it sounds just like my 2000 4.8 did when the power steering pump went bad. Might try taking the belt off and start motor to see if noise goes away. With the belt off I could pull in and out on the pully and it would make the clunking noise.
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08 5.3 Ext Cab 2WD. TS 224/224 cam 112 LSA, Comp 918 springs, TS 7.4 hardened push rods, LS7 lifters, LS 2 Valley cover, Ported throttle body,8.5 mm MSD wires, Coated Pacesetter LT's with ORY and 3 inch Flomaster 50, Yank SSTB 3200 stall, Yukon 4:56 gears with stock posi unit. Lowered 3.5 inches in the back and debadged. 323 RWHP 318 RWTQ with converter locked and open Y pipe, rolling on 20's. Made 302 RWHP unlocked. Tuned by BlueCat with HP Tuners
Sounds almost like a piston rocking in one of the cylinders to me...
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Billy My CarDomain Page
99 5.3 Z71 RC/SB - Comp 206/212 515/520 114, LS6 Springs, Harland Sharp 1.7's, 02 PCMforLess PCM, 02 Injectors, 160* stat, 05 E-fans, Nelson Harness, Volant CAI w/ Ram Air, StainlessWorks Headers and Catted Y-Pipe, Gibson single in, dual out muffler dumped before axle, 3.73 G80, Dropped on Gibbs 20's **Slowly saving for FLT Level7 and parts for my LQ9! CircleD Triple Disc already waiting!**
This might sound really crazy but it sounds just like my 2000 4.8 did when the power steering pump went bad. Might try taking the belt off and start motor to see if noise goes away. With the belt off I could pull in and out on the pully and it would make the clunking noise.
good info right there, forgot all about taking the belt off to rule out all the drive system parts.
i replaced the torque converter while the truck was down. and i swapped rockers from bank to bank. sound still on same side. i'll take the belt off this after noon and see what happens. while your B/S the power steering always has had a whine to it. it would increase and decrease with rpm. ever since i bought the thing.
i thought about the piston rocking too. what would make it suddenly decide to do it though? its never made the noise before then one day it just starts? although it did start after a hour drive that was like the most ruthless ride my trucks ever had. i don't think i will ever follow anybody that thinks they are in nascar again. would a compression check show this?
Does your truck`still have the stock catalytic converters on it? Mine just went bad and made a god awful noise like that. Cut'em out and put in some straight pipe, no more noise.
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2004 Sierra ECSB 2wd 5.3 Cat back, CAI, 14.83@ 92mph before the 22" KMC SS, no cats and Blackbear Peformance tune
1994 Slonoma Frankenstined w/'98 4.3, TH350, headers, full exhaust, UD pullies, PCM For Less Tune, no power steering, functional cowl induction, 4.10 gears, some weight reduction 3082# 13.86 @ 93mph. Lookin to swap in a 5.3!!!
Based on fast speed of the noise I would think its a piston. Usually killing the cylinder should make a difference in the noise on the effected cylinder. The problem is the only way to really check this is to pull the motor down and inspect pistons, wrist pins, and bore. IMO valve train noise would be half as fast.
__________________ 2005 5.7 Z71 SS ECSB
Old E.T. 13.41 @ 100.4 1.97 60ft W/ 5.3 & 112
Magnacharger Radix 122, 90MM LS2 T.B.,2.8 Pulley, Forged 6.0, Greg's Custom Engines 317 heads, A & A Corvettes stage III cam, Harland Sharps, OBX Stainless Longtubes, Magnaflow 15838 SS exhaust, Vara Ram C.A.I., 2 Bar SD HP Tuners, and a few other things.
no cats, see: trickperformance turbo. lol but i have removed a few in the past couple months that made some horrible noise. one on a xterra and the other on a silverado 4.3l.
would the piston show on a compression check? if so would it show better when cold or hot?
please help!!!!!
2005 5.7 Z71 SS ECSB 
