I recently purchased a 2011 9C1 from the police department and the car has 115,000 miles on it. Thanks to Bill and Maurice for their invaluable advice and time helping with suspension questions. I have successfully had the SS springs and brand new OEM struts, shocks and rubber mounts installed but still have bumps and noise at low and high speed. I have put the car up on the lift and can't find any worn out bushings that I can see. I'm willing to replace these but not interested in throwing money at the wrong place. Does anyone have any experience with this and suggestions?
Tracey Holtzclaw
tracey@dhpre.com
864-304-7581
bumps and noises under 2011 9C1
bumps and noises under 2011 9C1
2011 9C1 - well used by Georgia PD with 125K miles and growing
Camaro 3.27 LSD
Kooks 1-7/8 stainless long tube headers
Magnaflow 3" exhaust system (no cats, sounds great)
160HP dry nitrous shot
VCM OTR CAI
AFM delete and dyno tuned by http://www.V8Muscle.net" onclick="window.open(this.href);return false;
Chevy SS springs
Drag raced as often as possible
2015 9C1 - never in service. Purchased January 2017 with 700 miles
Chevy SS springs
2011 9C3 - never in service, purchased used in CA April 2016. Sold 3/4/17 with 111K miles.
Camaro 3.27 LSD
Kooks 1-7/8 stainless long tube headers
Magnaflow 3" exhaust system (no cats, sounds great)
160HP dry nitrous shot
VCM OTR CAI
AFM delete and dyno tuned by http://www.V8Muscle.net" onclick="window.open(this.href);return false;
Chevy SS springs
Drag raced as often as possible
2015 9C1 - never in service. Purchased January 2017 with 700 miles
Chevy SS springs
2011 9C3 - never in service, purchased used in CA April 2016. Sold 3/4/17 with 111K miles.
- Raunchtastic
- Posts: 113
- Joined: Fri Sep 25, 2015 10:53 pm
Re: bumps and noises under 2011 9C1
My car started making a soft "clunk" on the drivers side front strut, and more recently, on the passenger side. If you find out what it is, be sure to let us know. I am thinking my suspension is all original, so Ill have to start looking to replace it all. I would check the strut mounts. I haven't looked too much into how the suspension is, but on my Camaro there is a bearing that goes bad over time.
-----------------------------------------------------------
2012 Chevrolet Caprice "The Daily"
1992 Chevrolet Camaro RS 25th anniversary "The Wannabe Racecar"
2012 Chevrolet Caprice "The Daily"
1992 Chevrolet Camaro RS 25th anniversary "The Wannabe Racecar"
-
- Posts: 430
- Joined: Tue Dec 30, 2014 8:58 pm
- Location: Texas Hill Country
Re: bumps and noises under 2011 9C1
Check the strut tower bushings. Not the ones you can see under the hood but the ones that go under the tower, on top of the strut. They wear out and will cause this. I have also seen this problem right after new struts have been installed if the installer does not pay close attention to how they reassemble the new strut-spring. I had one leaking strut get replaced at the dealer and the tech put one of the washers on the wrong side of the tower causing the upper part of the strut to clunk against the top of the strut tower. These bushing I talked about earlier are supposedly the same ones used in the 04-06 GTO and are not the best quality, but that's just what I heard on the G8 board, maybe ours are made of different material. There are poly ones available.
Garner Ames
1975 Pontiac Grand Am L77 - 14.82 @ 92.89
1991 Chevrolet C1500 L31 Vortec/5 Speed
2002 Chevrolet Suburban 1500 LM7
2014 Chevrolet Caprice 9C1 L77 - 13.60 @ 105.87
2019 Chevrolet Express 3500 L96
1975 Pontiac Grand Am L77 - 14.82 @ 92.89
1991 Chevrolet C1500 L31 Vortec/5 Speed
2002 Chevrolet Suburban 1500 LM7
2014 Chevrolet Caprice 9C1 L77 - 13.60 @ 105.87
2019 Chevrolet Express 3500 L96
- elc32955
- System Manager
- Posts: 2742
- Joined: Thu Nov 29, 2012 10:32 am
- Location: East Central Florida
- Contact:
Re: bumps and noises under 2011 9C1
Don't think this is anywhere near the cause but I'll post it regardless since it refers to "clunk" when a vehicle is moved forward. Found this on the GM Tech-link page...
EricSome 2012–2015 Camaro SS, Camaro ZL1; 2013–2016 ATS; 2014–2016 CTS (VIN A); 2014–2015 Camaro Z/28, Caprice PPV, Corvette, and SS models may be hard to move after the vehicle has been parked for a period of time. A crunch sound right before the vehicle starts to move may be heard. Depending on how long the vehicle has been parked, the weather conditions in which the vehicle was parked, and how recently the vehicle has been washed, the condition may be a simple noise when the vehicle first moves or, at the extreme, the vehicle cannot be moved out of the parking space.
This condition may be due to the brake pads freezing to the vehicle’s rotors. Do not replace any brake components for this condition. High performance brake components (Fig. 11) have a tendency to lightly bind, often noted as resistance, and then lightly clunk when attempting to move the vehicle forward or rearward after a cold soak. This is usually noticed after parking, when the brakes have been wet, such as when driving in the rain or just after a car wash. This is expected of high performance brakes with high friction pads and does not affect the operation or performance of the brakes.
If a residual roughness is felt when braking, it can be easily cleaned by applying the brakes several times until the roughness is gone. If washing the vehicle prior to long-term storage, it is recommended that the vehicle be driven and the brakes applied several times before storing the vehicle.
System Manager and your tour guide for the day. 2015 Caprice w/LFX, former NC DPS staff car. Partial hybrid G8/SS/Camaro SS interior mods, SS MyLink radio upgrade, 2016 Camaro V6 rims, GMPP Malibu chrome exhaust tips, otherwise bone stock for now.