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Old 03-15-2011, 12:10 PM   #1
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Help: grinding noise when accelerating hard....

It first started last night. I was stopped at a light to get on the freeway. I accelerated hard and there was a slight grinding noise. I didn't think much of it at first. Well then it happened again this morning. It only happens when I am at a full stop and I accelerate hard. It doesn't happen in any other gears when I step on the gas and it doesn't happen when I accelerate gently from a complete stop.
The only recent changes I've done to my car is the 22mm rear sway and x-brace that I installed on Saturday. I did some spirited driving over the weekend and didn't notice anything. Can anyone help point me in a direction for what I should check? Thanks!

By the way I have the 6-speed auto.
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Old 03-15-2011, 12:18 PM   #2
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Where's the grinding coming from? If you can't hear it with the hood open and the car idling, I'd be inclined to look at the suspension rubbing. The car's going to lean back pretty hard when you get on the gas, so it may not necessarily be engine related.
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Old 03-15-2011, 12:38 PM   #3
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To be honest I'm really not sure. There is no noise whatsoever when the car is idling. It is definitely when I accelerate hard. I will take a look at the rear suspension to make sure everything is okay. I torqued everything down to spec.
A second issue arose just now. I was leaving the car wash and was at the stop light and I noticed just a tab bit of steam. First was a little wisp that caught my eye. It came from the right side. Then I noticed another bit of steam that came from the hood scoop. My water temp gauge was normal as was the idiot temp gauge. I pulled over and opened the hood and there was a quite a bit was of water coming from the engine compartment, the passenger side which would be consistent with the first bit of steam I saw from the passenger side of the car. I think it was from the car wash because the water was cold and it wasn't oily, warm, nor was it colored so I am almost certain it wasn't fluid. I think they pressure washers they use just got a lot of water under the bonnet. Everything looked fine under the bonnet otherwise.
I really would like to figure out where the hell that grinding noise is coming. Ugh!
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2006 MCSa [MMC #597] Checkmate & Prem Pkgs, Anthracite, Chromeline Int, ArmRest, RearFog, HK
Mods: Magnaflow, M7 STB, OEM Alarm, Autodim Mirror/HL, R52 Brace, EPS, Elec Fold Mirrors, Marshall Gauges (BOOST/OP/WTMP), GP IC w/ DDM ICD, JCW CAI w/ Madness Filter, 22mm Rear Sway, TSW X-Brace, Angel Eyes, 17% WMW Pulley, NGK Plugs, Mynes Tune, Bosch 550cc Injectors, ATI Super Damper
Someday: Mynes V2 Header/Head/Cam

http://www.motorlogs.com/dashboard/3944/881
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Old 03-15-2011, 12:47 PM   #4
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Grab the engine (not running) and rock it front to back. You might have an engine mount that went bad. This may allow more engine rotation than normal during heavy acceleration.
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Old 03-15-2011, 12:57 PM   #5
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I was kind of thinking that too. I have been reading about bad engine mounts and have been looking at replacing them with the TSW mounts from Way. When I rock the engine what am I looking for...easy to move, shouldn't move at all, a noise, etc?
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Mods: Magnaflow, M7 STB, OEM Alarm, Autodim Mirror/HL, R52 Brace, EPS, Elec Fold Mirrors, Marshall Gauges (BOOST/OP/WTMP), GP IC w/ DDM ICD, JCW CAI w/ Madness Filter, 22mm Rear Sway, TSW X-Brace, Angel Eyes, 17% WMW Pulley, NGK Plugs, Mynes Tune, Bosch 550cc Injectors, ATI Super Damper
Someday: Mynes V2 Header/Head/Cam

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Old 03-15-2011, 01:19 PM   #6
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The steam is normal with supercharged MINI's... Water gets into the engine bay through the scoop, and evaporates on various hot surfaces...

Many supercharged "S" owners learn to enjoy the "dragon's breath" coming from the scoop after a wash!

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Old 03-15-2011, 01:29 PM   #7
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that is kind of what I was thinking am0eba. The engine looked fine and the temps were normal. I like the "dragon's breath" though!
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Mods: Magnaflow, M7 STB, OEM Alarm, Autodim Mirror/HL, R52 Brace, EPS, Elec Fold Mirrors, Marshall Gauges (BOOST/OP/WTMP), GP IC w/ DDM ICD, JCW CAI w/ Madness Filter, 22mm Rear Sway, TSW X-Brace, Angel Eyes, 17% WMW Pulley, NGK Plugs, Mynes Tune, Bosch 550cc Injectors, ATI Super Damper
Someday: Mynes V2 Header/Head/Cam

http://www.motorlogs.com/dashboard/3944/881
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Old 03-15-2011, 02:35 PM   #8
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For the steam, I got steam after getting a lot of water in the radiator vanes, such as when I spray the radiator to get bugs off. It took awhile after the wash for the engine to get hot enough to create steam.

For the grinding noise;
Trying to rock the engine by hand would be a good idea.
Your X-Brace might be rubbing on the exhaust.
Another place to check, is the rear sway bar and end links to make sure they are not rubbing on the trailing arm.
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Old 03-15-2011, 02:51 PM   #9
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okay I will check those out. Thanks quikmni
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2006 MCSa [MMC #597] Checkmate & Prem Pkgs, Anthracite, Chromeline Int, ArmRest, RearFog, HK
Mods: Magnaflow, M7 STB, OEM Alarm, Autodim Mirror/HL, R52 Brace, EPS, Elec Fold Mirrors, Marshall Gauges (BOOST/OP/WTMP), GP IC w/ DDM ICD, JCW CAI w/ Madness Filter, 22mm Rear Sway, TSW X-Brace, Angel Eyes, 17% WMW Pulley, NGK Plugs, Mynes Tune, Bosch 550cc Injectors, ATI Super Damper
Someday: Mynes V2 Header/Head/Cam

http://www.motorlogs.com/dashboard/3944/881
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Old 03-15-2011, 03:19 PM   #10
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This is less likely but check your Catalytic converter. I had one come apart on me and I thought my engine had a terminal issue. Its gonna vary a little but it will tend to sound like small pebbles in a tin can (or a hollow grinding) and it will happen most noticeably under hard acceleration at first. It will get worse.

The other thing is that a cat-con shouldn't do that unless you are running rich. So, that is a sign of a problem in the engine.

Good luck.

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