Weird noise at engine shut off - Mazda 6 Forums : Mazda 6 / Mazda Atenza Forum

asutrane · 10-06-2009, 01:38 PM

I have had a weird noise happen every time I turn off my engine. I'm home sick from work today and decided to record it on camera. The audio quality sucks, but if someone knows whats going on I would greatly appreciate any advice.

I am not really sure where the noise is coming from exactly. This video is also on a cold start.

http://www.youtube.com/user/cp68966#play/a...l/0/GlrGekshwKE

You can hear it when I turn off the engine. It sounds like air being sucked, or something rubbing maybe. It could be something else though.

Thanks

MrTea · 10-06-2009, 10:46 PM

didn't hear anything abnormal unfortuantely? did the noise just start or has it been there the whole time....cause it sounds pretty normal.

asutrane · 10-06-2009, 10:50 PM

QUOTE (MrTea @ Oct 6 2009, 10:46 PM)

Quote:

didn't hear anything abnormal unfortuantely? did the noise just start or has it been there the whole time....cause it sounds pretty normal.[/b]

its been there a while. its hard to hear on that video cause the quality sucks. sounds a lot louder in real life. its kinda hard to explain what it sounds like, also.

ttshark · 10-07-2009, 04:28 AM

oooo yeah I can hear it. It sounds similar to the noise that a CAI makes when it sucks in the last bit of air with shut off, but it is definitely not that. It sounds exactly as told, like something rubbing that eventually stops from friction once the engine is off. You may want to check if anything is touching the alternator belt, the plastic in the wheel well can come off over time and cause it to rub. Also, make sure it is not the A/C fan or radiator fan. If they got dust in them or the bearings are going out then the fans tend to be very noisy (unless they are sleevless fans)

Worst case scenario, could be an air leak of some sort in the intake manifold but I doubt that because it doesn't sound whistly enough.

asutrane · 10-17-2009, 01:36 PM

Ok, so I did some messing around today. I noticed that when you shut off the power, the TB opens fully, and then closes. I don't know if this is causing the problem, but the noise seems to be coming from that area. I'm thinking about just letting the dealer look at it (although I hate going there).

ttshark · 10-17-2009, 10:20 PM

Have you got any performance parts on the car at all?

If it is the noise of air being sucked into the engine through the TB at shutoff then I would think that is normal. My car used to do it but since I got the injen CAI with a massive k&n pod it receives air very easily so you don't hear it.

asutrane · 10-17-2009, 11:57 PM

QUOTE (ttshark @ Oct 17 2009, 10:20 PM)

Quote:

Have you got any performance parts on the car at all?

If it is the noise of air being sucked into the engine through the TB at shutoff then I would think that is normal. My car used to do it but since I got the injen CAI with a massive k&n pod it receives air very easily so you don't hear it.[/b]

Nope, none at all. If it's normal then that's fine, I just wanted to make sure that nothing bad was going to happen lol.

MrTea · 10-18-2009, 07:24 PM

the tb will cycle at shutoff, not sure if that's what's worrying your or not?

Jinkx · 11-04-2009, 08:23 PM

QUOTE (MrTea @ Oct 18 2009, 03:24 PM)

Quote:

the tb will cycle at shutoff, not sure if that's what's worrying your or not?[/b]

I had to do the same repair for the same reason/noise, the gear in the TB butterfly motor gets stripped and skips. Replace the TB, you can't get just the motor, you have to buy the whole TB, I think it was like $300 from the dealer. You may also notice when you are driving around that you have delayed acceleration...

kpjimmy · 11-05-2009, 01:03 AM

QUOTE (Jinkx @ Nov 4 2009, 08:23 PM)

Quote:

I had to do the same repair for the same reason/noise, the gear in the TB butterfly motor gets stripped and skips. Replace the TB, you can't get just the motor, you have to buy the whole TB, I think it was like $300 from the dealer. You may also notice when you are driving around that you have delayed acceleration...[/b]

If its a TB you need dont spend 300 bux at the dealer, search for some here in the buy sell threads. I think frontline was selling some optimized ones as well as twowheelin who has been optimizing tb's for years. Both will cost less than $300. And you can def install it yourself. I have done it at least 5 times to clean and troubleshoot. It's just 4 bolts.

And I recommend optimized tb's 1111% lol

10-06-2009, 10:46 PM	#2 (permalink)
MrTea Super Moderator Join Date: Mar 2003 Location: Huntington Beach, CA Posts: 8,143 Thanks: 0 Thanked 1 Time in 1 Post Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	didn't hear anything abnormal unfortuantely? did the noise just start or has it been there the whole time....cause it sounds pretty normal. __________________ '03 Lapis(mostly) 6i...Tranny swap by Gillis Motorsports : MTX-75 5speed tranny, 4.06 gears, Torsen LSD & chromoly axles, Engine build by Gillis Motorsports: 9:1 Supertech Pistons, Crower rods, Supertech valves, springs & retainers, ARP head & main studs, F2 Stage2 Turbo, Custom F2 engine/tranny mounts, 3" Turboback exhaust, Tein Basic Coilovers, Brembo Big Brake Kit and Rotora Rear Rotors, RacingBeat Front & Rear Sways, Seibon OEM hood, VF Engineering rear engine mount, Powdercoated Valvecover, TEIN hood dampers, Some sort of Body Kit from some company usually last dyno 8/23, 10psi...260HP/267TQ Still need: Seat, cage, Gillis suspension...then i'm DONE!!

10-07-2009, 04:28 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	oooo yeah I can hear it. It sounds similar to the noise that a CAI makes when it sucks in the last bit of air with shut off, but it is definitely not that. It sounds exactly as told, like something rubbing that eventually stops from friction once the engine is off. You may want to check if anything is touching the alternator belt, the plastic in the wheel well can come off over time and cause it to rub. Also, make sure it is not the A/C fan or radiator fan. If they got dust in them or the bearings are going out then the fans tend to be very noisy (unless they are sleevless fans) Worst case scenario, could be an air leak of some sort in the intake manifold but I doubt that because it doesn't sound whistly enough. __________________ 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

10-17-2009, 10:20 PM	#6 (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	Have you got any performance parts on the car at all? If it is the noise of air being sucked into the engine through the TB at shutoff then I would think that is normal. My car used to do it but since I got the injen CAI with a massive k&n pod it receives air very easily so you don't hear it. __________________ 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

10-18-2009, 07:24 PM	#8 (permalink)
MrTea Super Moderator Join Date: Mar 2003 Location: Huntington Beach, CA Posts: 8,143 Thanks: 0 Thanked 1 Time in 1 Post Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	the tb will cycle at shutoff, not sure if that's what's worrying your or not? __________________ '03 Lapis(mostly) 6i...Tranny swap by Gillis Motorsports : MTX-75 5speed tranny, 4.06 gears, Torsen LSD & chromoly axles, Engine build by Gillis Motorsports: 9:1 Supertech Pistons, Crower rods, Supertech valves, springs & retainers, ARP head & main studs, F2 Stage2 Turbo, Custom F2 engine/tranny mounts, 3" Turboback exhaust, Tein Basic Coilovers, Brembo Big Brake Kit and Rotora Rear Rotors, RacingBeat Front & Rear Sways, Seibon OEM hood, VF Engineering rear engine mount, Powdercoated Valvecover, TEIN hood dampers, Some sort of Body Kit from some company usually last dyno 8/23, 10psi...260HP/267TQ Still need: Seat, cage, Gillis suspension...then i'm DONE!!

10-06-2009, 01:38 PM	#1 (permalink)
asutrane Learners License Join Date: Aug 2008 Location: Asheville, NC Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	I have had a weird noise happen every time I turn off my engine. I'm home sick from work today and decided to record it on camera. The audio quality sucks, but if someone knows whats going on I would greatly appreciate any advice. I am not really sure where the noise is coming from exactly. This video is also on a cold start. http://www.youtube.com/user/cp68966#play/a...l/0/GlrGekshwKE You can hear it when I turn off the engine. It sounds like air being sucked, or something rubbing maybe. It could be something else though. Thanks

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10-17-2009, 01:36 PM	#5 (permalink)
asutrane Learners License Join Date: Aug 2008 Location: Asheville, NC Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Ok, so I did some messing around today. I noticed that when you shut off the power, the TB opens fully, and then closes. I don't know if this is causing the problem, but the noise seems to be coming from that area. I'm thinking about just letting the dealer look at it (although I hate going there).