Please help diagnose popping sound prior to "diving in" - ZR-1 Net Registry Forums

billschroeder5842 · 05-16-2021

Hey All,

Can you help point me in the right direction with a few "check this out" before I start tearing into things? My '91 has about 85k on it and runs smooth with all original (except shocks) suspension components.

I'm getting an intermittent driveline noise and if feels/sounds like it is clutch related. Here are the "symptoms:"

1) Intermittent slight "quick metallic popping" sound. Reminds me of the sound my rear hub shaft makes. (I've taken that thing apart several times to no avail- I now just look forward to hearing it)
2) Seems to be only when I take off from a start, only "pops" once- occasionally and non predictable. Cold or warmed up, makes no difference
3) Feels like when I'm more aggressive (not burn out aggressive) I get the noise. Starting easy and releasing the clutch slowly and there is nothing.
4) Never get the noise in any other gear.
5) No driveline vibration
6) Clutch feels normal and fluids are good

At times I wonder if my dual mass flywheel is having "moments" as the sound "sort of, kind of" reminds me of a "clicker" version.

I appreciate any direction- I know that diagnosing sounds is difficult!

32valvesftw · 05-16-2021

I had a weird noise like that, it went away when the suspension was greased. My other thought would be a half shaft u-joint that is worn.

Ccmano · 05-16-2021

Has the C Beam been out? Re torque the C Beam bolts and see what happens. If that's it get a set of Beam Plates from ZF Doc.
H

billschroeder5842 · 05-16-2021

Thanks guys. I'll check both the C beam (I never would have thought to check that) and the u joints along with a general inspection. Plus it never hurts to give everything a shot of grease.

GOLDCYLON · 05-16-2021

Also check the rear wheel hub washer. As the Teflon tend to wear the popping continues

XfireZ51 · 05-16-2021

Does Jerry carry those washers?

GOLDCYLON · 05-16-2021

Quote:

Originally Posted by XfireZ51

Does Jerry carry those washers?

Not sure and they are becoming hard to find. They are the same part number the entire C-4 run and not ZR-1 specific. However I have heard that popping noise before and it?s those darn washers . GC

A26B · 05-17-2021

Quote:

Originally Posted by XfireZ51

Does Jerry carry those washers?

I will look into it.

Does anyone have a new or good used one that I can sample from for material analysis & dimensions?

billschroeder5842 · 05-16-2021

Yeah, I've replaced the washers in the rear and it still pops. I went +10 on the torque and it did not seem to matter.

Corvette95 · 05-17-2021

watching thread, I would like some of those washers too if anyone has a source and part# (but only after the OP gets theirs first).

05-16-2021	#2
32valvesftw Join Date: Jun 2015 Location: Texas Posts: 530	Re: Please help diagnose popping sound prior to "diving in" I had a weird noise like that, it went away when the suspension was greased. My other thought would be a half shaft u-joint that is worn.

05-16-2021	#3
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Please help diagnose popping sound prior to "diving in" Has the C Beam been out? Re torque the C Beam bolts and see what happens. If that's it get a set of Beam Plates from ZF Doc. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

05-16-2021	#4
billschroeder5842 Join Date: Nov 2016 Location: Southlake, TX Posts: 592	Re: Please help diagnose popping sound prior to "diving in" Thanks guys. I'll check both the C beam (I never would have thought to check that) and the u joints along with a general inspection. Plus it never hurts to give everything a shot of grease. __________________ Bill Schroeder Texas Proud! 1991 Corvette ZR1 #1388 2015 Challenger Scat Pack Shaker

05-16-2021	#5
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Please help diagnose popping sound prior to "diving in" Also check the rear wheel hub washer. As the Teflon tend to wear the popping continues __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 05-16-2021 at 07:26 PM.

05-16-2021	#6
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Please help diagnose popping sound prior to "diving in" Does Jerry carry those washers? __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

05-17-2021	#10
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,119	Re: Please help diagnose popping sound prior to "diving in" watching thread, I would like some of those washers too if anyone has a source and part# (but only after the OP gets theirs first). __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454