clunk noise from rear passenger side - 2003-04 Mach 1 Registry Owners Club

Iownamachtoo · 08-21-2009, 04:06 AM

hey guys, just picked up my car and am trying to iron out some of the general issues with it. the only one that really bothers me is the clunk coming from what seems to be above, around, or in the passenger side wheel well area. its a clunk that occurs with every bump, so I assume it is something with the suspension. nothing seems to be bumping around (exhaust etc.). I dont want to bring it in for service without being more knowlegable about the situation. has anyone had any experience with this?

Lonestar7 · 08-21-2009, 04:20 AM

Could be a poped weld we have seen problems like these with noise. Just something to check.

LS

3150Mach1 · 08-21-2009, 06:19 AM

Sounds like either exhaust or a blown lower control arm bushing. I have had both problems.

Exhaust could be banging on the subframe connectors.

gilmoujr · 08-21-2009, 08:38 AM

Quote:

Originally Posted by 03Mach150BP

lower control arm bushing.

Exactly what I was thinking. These bushings get worn QUICK.

Mudd92 · 08-21-2009, 09:40 AM

If you search you will my old post, I had the same issue. I like a few others had a popped spot weld. I took out the back trunk lining and folded the back seat down and right in the pas upper corner where the seat lays back is where mine popped. I just stuck 2 washers in there to space the gap and its very tight, I know have no clunking no matter how hard I hit the bump's/

shane361 · 08-21-2009, 10:53 AM

Check the exhaust where it bolts up close to the rear bumper. Part that holds the exhaust tip area of the exhaust. Mine clunks rite there and it sucks. About to do some other measures cause tightening doesnt help.-Shane

Devery · 11-04-2009, 08:26 PM

I've got the same mystery banging noise coming from the rear passenger side. Seems to be most pronounced at lower speeds (below 40 mph) over bumpy roads. I've torn interior apart, body panels, and now plan on moving to control arm, rear shocks, brakes next...noise sux!!!

va2ir · 11-04-2009, 09:31 PM

ALLDATA reported a rear end noise associated with the rear sway bar. Search the TSB's - you may find the fix. I will try and post it here tomorrow

BluBlurr32V · 11-05-2009, 02:01 AM

Exhaust........mine was rubbing on the floor pan.

You might also check the tail pipes (I dont mean exhaust tips)

Mine was also rubbing on the rear sway bar. I didn't notice it cause everytime I would jack up the car, it wouldn't rub. Only until the car was on its own weight.

francismaximus · 11-05-2009, 07:54 AM

I've had to tighten my tailpipe mounting bracket on my magnaflow exahaust system made a pop/clunk while hitting sharp quick bumps. The part that attaches to the tailpipe itself.

shane361 · 11-05-2009, 11:37 AM

I thought mine was the tail pipes and it was loose but the noise was comming from the exhaust just off the muffler hitting the stabilizer/sway bar thing. Not sure it thats what is called, sorry. Loosened up the exhaust realigned it and tightened and noise is no more. -Shane

DanB · 11-05-2009, 11:55 AM

i have found when this noise is there that the upper torque box where it mounts to the car is broken thus causing the noise any time you accelerate an easy fix if it isn’t too bad is to install a set of upper battle boxes and that generally takes care of this issue

blown03Mach1 · 11-05-2009, 01:42 PM

Quote:

Originally Posted by DanB

i have found when this noise is there that the upper torque box where it mounts to the car is broken thus causing the noise any time you accelerate an easy fix if it isn’t too bad is to install a set of upper battle boxes and that generally takes care of this issue

Would this also be the cause for a "creaking" sound that can be heard on deceleration? I had the torque box seams welded a while ago, but I have not looked at them recently to see if the whole box has a rip in it.

BTW I have looked for the broken spot weld and that is not causing it. I have thought about pulling the rear seat assemblies and having someone in the back listening to pinpoint were the creaking is coming from.

Thx

CompOrange · 11-05-2009, 01:56 PM

Quote:

Originally Posted by blown03Mach1

Would this also be the cause for a "creaking" sound that can be heard on deceleration? I had the torque box seams welded a while ago, but I have not looked at them recently to see if the whole box has a rip in it.

BTW I have looked for the broken spot weld and that is not causing it. I have thought about pulling the rear seat assemblies and having someone in the back listening to pinpoint were the creaking is coming from.

Thx

What style of bushing are you using in the rear? Poly, Rubber, metal spherical?

Bwahl602 · 11-05-2009, 05:06 PM

i have a clunk or two... mine sounds like the rear deck (speaker deck) is rattling...
im prettyy sure the lca bushings are shot.. car gets put away in 2 weeks then torn down for a whole new rear suspension... ill be doing a bit of welding on the body to tighten things up and replacing all suspension components back there...

ill let you know what i find..

good luck with your though... id say top possibilitys are LCAs, exhaust, spot weld, loose 460, loose spare tire, shot UCAs, busted trq boxes

DanB · 11-05-2009, 05:36 PM

we use to rip thm all the time and that is what the noise sounded like. now we weld them up first

blown03Mach1 · 11-05-2009, 05:54 PM

Quote:

Originally Posted by CompOrange

What style of bushing are you using in the rear? Poly, Rubber, metal spherical?

I am running the Steeda aluminum UCA and LCA with the poly bushings. From the drivers seat, the creaking sounds like it is coming from high in the right rear wheel well, but I have pulled the liner and looked at the welds. I was thinking about pulling the control arms and re-lubing all points to see if that helps.

Devery · 11-05-2009, 08:24 PM

I've got Eibach Sportline springs w/poly bushings, everything else is factory out back. I will find that gremlin if it's the last thing I do!

Devery · 11-15-2009, 09:58 AM

Quote:

Originally Posted by Mudd92

If you search you will my old post, I had the same issue. I like a few others had a popped spot weld. I took out the back trunk lining and folded the back seat down and right in the pas upper corner where the seat lays back is where mine popped. I just stuck 2 washers in there to space the gap and its very tight, I know have no clunking no matter how hard I hit the bump's/

This was my problem. I could not believe jamming a washer in that seam would stop this frustrating noise that was driving me nuts! I was skeptical but now I'm a believer...thank you!!!

08-21-2009, 04:06 AM	#1
Iownamachtoo Registered User Join Date: Jul 2009 Location: Long Island, New York Posts: 20	clunk noise from rear passenger side hey guys, just picked up my car and am trying to iron out some of the general issues with it. the only one that really bothers me is the clunk coming from what seems to be above, around, or in the passenger side wheel well area. its a clunk that occurs with every bump, so I assume it is something with the suspension. nothing seems to be bumping around (exhaust etc.). I dont want to bring it in for service without being more knowlegable about the situation. has anyone had any experience with this?

08-21-2009, 04:20 AM	#2
Lonestar7 Guest Join Date: Apr 2007 Location: Denver, CO Posts: 3,152	Re: clunk noise from rear passenger side Could be a poped weld we have seen problems like these with noise. Just something to check. LS

08-21-2009, 06:19 AM	#3
3150Mach1 Love my Mach Join Date: Apr 2005 Location: Charlottesville, VA Posts: 13,678	Re: clunk noise from rear passenger side Sounds like either exhaust or a blown lower control arm bushing. I have had both problems. Exhaust could be banging on the subframe connectors. __________________ 2003 slowmatic 11.105@117mph w/125 shot of Nitrous best to date Kooks LTsw/OR X, elect cutouts, JLT RAI w/C&L 85 MAH,1" Spacer,PP Lower intake,Accufab TB,160 T-stat,EF Cooling Mod,NX Kit,Mez Electric Water pump,SLP Linelock,FRPP 4.10s-Alum Dif Cover-Alum Driveshaft & SL, Steeda Bumpsteer,MM Alum rack bushings,Deep Alum Tranny pan,Predator,Steeda AUCAs,MM ALCAs, Dspecs,MM CC plates & FLSFCs,MRT Guage cluster,AEM WB,MRT hood struts,Seq TLs, carbon fiber hood/trunk/Cobra wing,220 amp alt

08-21-2009, 09:40 AM	#5
Mudd92 03 Mach Join Date: Jan 2009 Location: Savannah, GA Posts: 1,396	Re: clunk noise from rear passenger side If you search you will my old post, I had the same issue. I like a few others had a popped spot weld. I took out the back trunk lining and folded the back seat down and right in the pas upper corner where the seat lays back is where mine popped. I just stuck 2 washers in there to space the gap and its very tight, I know have no clunking no matter how hard I hit the bump's/ __________________ -03 AB Mach 5spd Accufab TB, BBK LT's, BBK O/R X, Mac Catback, JLT RAI, 98 Cobra intake cams, EBC redstuff pads, slotted drilled rotors, 31 spline mosers, 31 spline cobra posi, 3" studs, FRPP 3:73, welded tubes, smoked tails. Eaton swap! 465hp,425tq @ 15deg and 3.4pulley @ 10lb. T56 magnum! - Tuned by Eric Brooks! Built motor coming soon -95 Chevy C1500 5.7 auto Stock, tow rig and DD. -Joey

08-21-2009, 10:53 AM	#6
shane361 Registered User Join Date: Feb 2009 Location: San Diego, CA Posts: 570	Re: clunk noise from rear passenger side Check the exhaust where it bolts up close to the rear bumper. Part that holds the exhaust tip area of the exhaust. Mine clunks rite there and it sucks. About to do some other measures cause tightening doesnt help.-Shane __________________ http://i63.photobucket.com/albums/h1...-Shane3612.gif 2004 DSG Mach12004 Competition Orange KB Cobra

11-04-2009, 08:26 PM	#7
Devery Registered User Join Date: Sep 2003 Location: Cabot, Arkansas Posts: 539	Re: clunk noise from rear passenger side I've got the same mystery banging noise coming from the rear passenger side. Seems to be most pronounced at lower speeds (below 40 mph) over bumpy roads. I've torn interior apart, body panels, and now plan on moving to control arm, rear shocks, brakes next...noise sux!!! __________________ *2003 Oxford White 5 Speed MACh 1* - 15% Window Tint - MGW Silver Radio, A/C Knobs - MRT Interceptor Guages - Black Antenna (Trimmed Down to 14") - Cobra Jet Shaker Scoop/SVT Emblems - MACh 1 License Plate Frame - Eibach Sportlines - 03 Cobra front/rear fascia, rocker panels - Grillcraft Sport Grille (lower) - Hurst Shifter - 18x9&18x10s w/255/295 BFGs

11-04-2009, 09:31 PM	#8
va2ir Registered User Join Date: Nov 2009 Location: Montreal, Canada Posts: 50	Re: clunk noise from rear passenger side ALLDATA reported a rear end noise associated with the rear sway bar. Search the TSB's - you may find the fix. I will try and post it here tomorrow

11-05-2009, 02:01 AM	#9
BluBlurr32V Bro's B4 Ho's Join Date: Jul 2007 Location: sunny,ca Posts: 615	Re: clunk noise from rear passenger side Exhaust........mine was rubbing on the floor pan. You might also check the tail pipes (I dont mean exhaust tips) Mine was also rubbing on the rear sway bar. I didn't notice it cause everytime I would jack up the car, it wouldn't rub. Only until the car was on its own weight. __________________ 2003 Mach 1 IUP Azure Blue DOB: 7/28/03 Magnapack Cat-back, Bassani Catted X-pipe, C&L intake, MGW shifter, MM FLSC, MM Alum steering rack bushings, MM S/S brake lines, MM C/C plates, MM Panhard Bar, H&R Race springs, Blistein HD's, Steeda 2pt STB, Moser 31-spline axles, and S197 posi

11-05-2009, 07:54 AM	#10
francismaximus Registered User Join Date: Aug 2009 Location: West Lafayette, IN Posts: 266	Re: clunk noise from rear passenger side I've had to tighten my tailpipe mounting bracket on my magnaflow exahaust system made a pop/clunk while hitting sharp quick bumps. The part that attaches to the tailpipe itself.

11-05-2009, 11:37 AM	#11
shane361 Registered User Join Date: Feb 2009 Location: San Diego, CA Posts: 570	Re: clunk noise from rear passenger side I thought mine was the tail pipes and it was loose but the noise was comming from the exhaust just off the muffler hitting the stabilizer/sway bar thing. Not sure it thats what is called, sorry. Loosened up the exhaust realigned it and tightened and noise is no more. -Shane __________________ http://i63.photobucket.com/albums/h1...-Shane3612.gif 2004 DSG Mach12004 Competition Orange KB Cobra

11-05-2009, 11:55 AM	#12
DanB 1 man Army Join Date: Apr 2006 Location: Phoenix Posts: 2,955	Re: clunk noise from rear passenger side i have found when this noise is there that the upper torque box where it mounts to the car is broken thus causing the noise any time you accelerate an easy fix if it isn’t too bad is to install a set of upper battle boxes and that generally takes care of this issue __________________ Dan

11-05-2009, 05:06 PM	#15
Bwahl602 Pilot Join Date: Mar 2009 Location: West Grove, Pa Posts: 653	Re: clunk noise from rear passenger side i have a clunk or two... mine sounds like the rear deck (speaker deck) is rattling... im prettyy sure the lca bushings are shot.. car gets put away in 2 weeks then torn down for a whole new rear suspension... ill be doing a bit of welding on the body to tighten things up and replacing all suspension components back there... ill let you know what i find.. good luck with your though... id say top possibilitys are LCAs, exhaust, spot weld, loose 460, loose spare tire, shot UCAs, busted trq boxes __________________ 04 TR mach. #6787

11-05-2009, 05:36 PM	#16
DanB 1 man Army Join Date: Apr 2006 Location: Phoenix Posts: 2,955	Re: clunk noise from rear passenger side we use to rip thm all the time and that is what the noise sounded like. now we weld them up first __________________ Dan

11-05-2009, 08:24 PM	#18
Devery Registered User Join Date: Sep 2003 Location: Cabot, Arkansas Posts: 539	Re: clunk noise from rear passenger side I've got Eibach Sportline springs w/poly bushings, everything else is factory out back. I will find that gremlin if it's the last thing I do! __________________ *2003 Oxford White 5 Speed MACh 1* - 15% Window Tint - MGW Silver Radio, A/C Knobs - MRT Interceptor Guages - Black Antenna (Trimmed Down to 14") - Cobra Jet Shaker Scoop/SVT Emblems - MACh 1 License Plate Frame - Eibach Sportlines - 03 Cobra front/rear fascia, rocker panels - Grillcraft Sport Grille (lower) - Hurst Shifter - 18x9&18x10s w/255/295 BFGs

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