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1G RDX Rattling Noise Off Accelerator

 
Old 11-06-2016, 09:06 PM
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1G RDX Rattling Noise Off Accelerator

Hi. I have a 2007 RDX Tech Package that has started making a rattling noise (aluminum like very fast clatter). This only happens when decelerating. To verify, when the car is in park the sounds still happens. I would rev up the rpm's to 1500 and let off, 2000 r's and eventually up to 3,000. Just like when driving, the rattling, aluminum or thin metal rapid clanking noise occurs whenever taking my foot off the accelerator. The noise doesn't happen at idle nor acceleration. Lastly, when turning off the car, the noise will happen again. Could this be a turbo/vacuum problem?
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Old 11-07-2016, 12:21 AM
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Or cat heat shield
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Old 11-07-2016, 07:57 AM
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Outside shot, but could also be a worn / shot motor mount.
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Old 11-07-2016, 08:30 AM
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Originally Posted by thoiboi View Post
Or cat heat shield
I had a similar problem. Shield removed, sound gone.
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Old 11-07-2016, 12:25 PM
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Thanks to everyone for the help! I will check the cat shield first and then the motor mount. The project for this weekend is attempting to change the thermostat since the heat doesn't work. I don't have a repair manual but did find a website that has how-to's (albeit limited) detailed diagrams and parts lists for the car and am using this as a guide to try. Plus, it only cost me around $20 for a year's access. I'm not super experienced so am giving myself the whole day to try.
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Old 11-14-2016, 11:09 PM
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Here is a link to a downloadable shop manual. See post#14
https://acurazine.com/forums/1g-rdx-...quests-832901/
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Old 11-14-2016, 11:11 PM
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Old 11-14-2016, 11:12 PM
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Darn it. Paste this into your browser

https://acurazine.com/forums/1g-rdx-...quests-832901/
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Old 11-14-2016, 11:17 PM
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I know this video is of an A4, however is this the rattling noise your car is making when letting off the throttle?
https://vimeo.com/103075731?ref=em-share
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Old 11-16-2016, 07:52 PM
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Originally Posted by 86j View Post
I know this video is of an A4, however is this the rattling noise your car is making when letting off the throttle?
https://vimeo.com/103075731?ref=em-share
I am just now getting to log back on due to work. That's the sound! Not the harder, louder knocking sound but the more fine and softer aluminum like one!

Turns out my thermostat is good so I have no idea what could be the cause of the heater not working. I was told that if the thermostat was bad, the engine would run either hot or cold.

I'm wondering if I should bite the bullet and take it to a mechanic. With that engine sound, heat not working (but AC does) and that B123 service due regarding the transmission, I'm wondering if this is beyond my abilities.

Any advice on whether or not I should try to tackle these issues on my own first?
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Old 11-16-2016, 08:17 PM
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Originally Posted by 86j View Post
Darn it. Paste this into your browser

https://acurazine.com/forums/1g-rdx-...quests-832901/
Wow! Incredible manual! Thank you so much!!!
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Old 11-16-2016, 09:31 PM
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My rattle was coming from the Turbo Variable Flow control valve arm. It may be worth a look, the video shows how much play there was on mine.
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Old 11-16-2016, 09:39 PM
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Thermostat change should be DIY at home, the shop manual will have all the steps

I don't mess changing auto Transmission fluid change myself, easier and cleaner to pay for that one.
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Old 11-16-2016, 10:25 PM
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Originally Posted by 86j View Post
My rattle was coming from the Turbo Variable Flow control valve arm. It may be worth a look, the video shows how much play there was on mine. https://youtu.be/je2ogVIy92k.
Did the play in the arm cause a noise on yours? Did you have to tighten it to correct the play? Thanks for posting - video had great resolution!
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Old 11-16-2016, 10:28 PM
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Originally Posted by 86j View Post
Thermostat change should be DIY at home, the shop manual will have all the steps

I don't mess changing auto Transmission fluid change myself, easier and cleaner to pay for that one.
I'm afraid the thermostat isn't the problem now. An amateur but knowledgeable mechanic told me it couldn't be the thermostat since my engin running temp was normal and not hot or cold. I've been trying to view the service manual to find troubleshooting tips.
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Old 11-16-2016, 10:40 PM
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Yup the play in the arm caused the noise on my car. That softer aluminum sound from the video you hear when the engine RPMs start to fall back to idle.

The problem I uncovered was the metal wears out on the bottom of the Actuator rod and makes the bore larger. These are a few pictures from another members thread that show some of the wear. The problem is none of the parts are available at Acura. I tied some metal wire around it to correct the play
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Old 11-16-2016, 10:49 PM
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When I have more time I am going to take the Actuator arm off and have a new piece machined at a local shop. This is a quick video showing the wire I tied around it.


I started to get an intermittent check engine light. It turned out the code was a Turbo charger system malfunction. I believe the play in the arm allowed the Variable Flow valve to open slightly early and effect the boost from the Turbo. There are too many solenoids to control these modern Turbo engines.
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Old 11-18-2016, 04:07 PM
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Originally Posted by 86j View Post
When I have more time I am going to take the Actuator arm off and have a new piece machined at a local shop. This is a quick video showing the wire I tied around it.

https://youtu.be/RTmGtN5mxI0

I started to get an intermittent check engine light. It turned out the code was a Turbo charger system malfunction. I believe the play in the arm allowed the Variable Flow valve to open slightly early and effect the boost from the Turbo. There are too many solenoids to control these modern Turbo engines.
Wow! Those are great pics and videos! I'm afraid I may have the same problem. I drove it to a mechanic today and am turning it in the shop Monday morning. I am going to be sure and report back as to the "no heat" problem from the car hvac as well as the engine noise. The mechanic took a quick look and said my thermostat was not the problem and my lines were hot but suspected something could be wrong electronically or in the dash.
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Old 11-18-2016, 04:13 PM
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I'll also try and get a video tonight inside of the garage so we can compare noises. Thanks again to all!
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Old 11-23-2016, 08:12 AM
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Originally Posted by 86j View Post
When I have more time I am going to take the Actuator arm off and have a new piece machined at a local shop.

Thanks for posting the great videos!


If you have a new piece made, you may consider making some extras to sell to other members, or see if the shop can keep the specs on file for people to order one.
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Old 09-02-2018, 09:25 AM
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How did you manage to swage the cable in such a tight spot?
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Old 04-10-2019, 01:55 PM
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Variable flow Geometry Actuator connector to valve Root cause

FYI. I found a good guy who makes these parts. Cost me $160. Darren said he has sold over 80 since October 2018

Here is his info

[email protected]
Darren Gauryletz Cell:905-320-5191
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Old 04-10-2019, 01:58 PM
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You tube with more info on how to fix rattling coming from Turbo
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Old 04-17-2019, 07:15 PM
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Thanks 🙏🏻
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