Think I have a bad dogbone mount - Mazda 6 Forums : Mazda 6 / Mazda Atenza Forum

TNM6i · 11-01-2009, 07:56 PM

Car is '06 6i ATX. When the weather is cool-cold (50's and below) I get a grinding/popping noise front the front of the car when taking off from a stop. The noise is worse when the engine is under a strain, like taking off on an incline. At first I thought it was suspension related, but I never really noticed it while driving over bumps, potholes, etc, so suspension movement (compression/rebound) doesn't seem at fault here. It kinda sounds like a CV joint, but it doesn't make the noise when turning or when the car is underway, only from a stop. I was under the car today and inspected the bushings, but can see no visible sign of a problem. I'm kinda at a loss here. I had the dealer look at it last fall, but as usual, they gave me that "could not replicate" BS. Any advice on how to identify the noise a bad mount makes would be greatly appreciated!

javim007 · 11-01-2009, 09:32 PM

Usually you will hear a thud from the engine rocking forward/backward. As excessive engine movement will cause the engine, exhaust etc. to hit other parts of the car. Excessive engine movement is another indicator.Only way to be 100% sure is to visually inspect the mounts.
You are on to something though as it is usually the bone mount that goes bad first in the 6. GL

TNM6i · 11-01-2009, 10:56 PM

Hmm....I wouldn't describe the noise as a "thud" per say, as in the engine moving enough to make contact with something else. It's more of a grinding/popping, sort of like metal on metal, but dampened, if that makes sense. I also thought it could be a coil spring isolator bushing that had worn through and was letting the end of the spring grind against the control arm. Whatever it is, I cannot replicate it while the car in in motion. It only happens when taking off from a stop, and is a constant noise for about 2 seconds and it stops. It really seems like the engine moving a bit is what causes it. I'm really stumped with this one!

ttshark · 11-02-2009, 04:50 AM

I would really think it is a mount. Check every one. Driver's side, Passenger's side, wishbone mount and the transmission mount as well.

Look for any tears in the rubber. But be careful because the driver/passenger mounts sorta has a rip from manufacturing so it can be mistaken for a bad mount.

The tear should look more like a crack if that makes sense.

11-01-2009, 07:56 PM	#1 (permalink)
TNM6i Rally Racer Join Date: Jun 2003 Location: Nashvegas Posts: 1,172 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Car is '06 6i ATX. When the weather is cool-cold (50's and below) I get a grinding/popping noise front the front of the car when taking off from a stop. The noise is worse when the engine is under a strain, like taking off on an incline. At first I thought it was suspension related, but I never really noticed it while driving over bumps, potholes, etc, so suspension movement (compression/rebound) doesn't seem at fault here. It kinda sounds like a CV joint, but it doesn't make the noise when turning or when the car is underway, only from a stop. I was under the car today and inspected the bushings, but can see no visible sign of a problem. I'm kinda at a loss here. I had the dealer look at it last fall, but as usual, they gave me that "could not replicate" BS. Any advice on how to identify the noise a bad mount makes would be greatly appreciated! __________________ <span style="font-family:Tahoma">2006 6i Grand Sport \| Glacier Silver Metallic Smoked LED Rear Reflectors \| Smoked LED Sidemarkers \| LED Lighting \| CX-7 Antenna \| Airbox Mod \| 17" Enkei RP03s Future Plans: Window Tint \| Painted Calipers/Hubs \| Racing Beat Axle-Back Exhaust</span>

11-01-2009, 09:32 PM	#2 (permalink)
javim007 Rally Racer Join Date: Feb 2007 Location: Tampa, Fl. Posts: 1,044 Thanks: 0 Thanked 1 Time in 1 Post Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Usually you will hear a thud from the engine rocking forward/backward. As excessive engine movement will cause the engine, exhaust etc. to hit other parts of the car. Excessive engine movement is another indicator.Only way to be 100% sure is to visually inspect the mounts. You are on to something though as it is usually the bone mount that goes bad first in the 6. GL __________________ The only Good is Knowledge, the only Evil is Ignorance. - Socrates

11-01-2009, 10:56 PM	#3 (permalink)
TNM6i Rally Racer Join Date: Jun 2003 Location: Nashvegas Posts: 1,172 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Hmm....I wouldn't describe the noise as a "thud" per say, as in the engine moving enough to make contact with something else. It's more of a grinding/popping, sort of like metal on metal, but dampened, if that makes sense. I also thought it could be a coil spring isolator bushing that had worn through and was letting the end of the spring grind against the control arm. Whatever it is, I cannot replicate it while the car in in motion. It only happens when taking off from a stop, and is a constant noise for about 2 seconds and it stops. It really seems like the engine moving a bit is what causes it. I'm really stumped with this one! __________________ <span style="font-family:Tahoma">2006 6i Grand Sport \| Glacier Silver Metallic Smoked LED Rear Reflectors \| Smoked LED Sidemarkers \| LED Lighting \| CX-7 Antenna \| Airbox Mod \| 17" Enkei RP03s Future Plans: Window Tint \| Painted Calipers/Hubs \| Racing Beat Axle-Back Exhaust</span>

11-02-2009, 04:50 AM	#4 (permalink)
ttshark Track Racer Join Date: Nov 2008 Location: Sydney, Australia Posts: 405 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	I would really think it is a mount. Check every one. Driver's side, Passenger's side, wishbone mount and the transmission mount as well. Look for any tears in the rubber. But be careful because the driver/passenger mounts sorta has a rip from manufacturing so it can be mistaken for a bad mount. The tear should look more like a crack if that makes sense. __________________ 2002 Mazda 6 Limited series 1 Manual 2.3L I-4 Australian Model (Jap Spec) 10:6 High Compression Current Mods: BC Racing Coilovers \| Injen CAI \| Advanced Timing \| Dark Yellow Smoked Fog Lights \| 18" Mazda RX-8 Wheels on Bridgestone GIII 225's \| Raybrig 4500K Pure White Parker/licence/door Bulbs imported from Japan \| Audiolink ipod Connection \| Fluoro Orange Rocker Cover \| Custom Grounding Kit \| Breather Air Filter \| Apexi Turbo Timer \| PCV Oil Catch Can (Still need to install) \| RDA Front Slotted Rotors \| ACRE Super Fighter Pads \| NGK Plug Wires \| 6-SMD Red Interior Map Lights \| Honda S2000 Gearknob Coming SUPER soon: HIDs (Freight Container Arriving Soon) \| Front/Rear Strut Bar \| Exedy Stage 1 Sports Organic Clutch \| Exedy Lightened Flywheel Coming soon: F2 Supercharger kit \| F2 Header \| Custom 3" Catback Exhaust System with High Flow Cat \| Complete Haltech Tune

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