Engine Noise Diagnosis - Solved
09-17-2014, 06:40 AM
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Engine Noise Diagnosis - Solved
Hi guys,
I was wondering if you could take a listen and give your input on what you think this might be.
Background:
'01 124k km, no engine mods other than K&N intake kit. I recently started hearing a scratchy clicky noise with the window down, resonating from under the car and off the curb on initial throttle and deceleration. I don't drive the car much and I finally got around to taking it to my tech yesterday. It turns out, I was really low on oil. Maybe 1.5L came out when changed. It's strange because I changed it before storing last winter and brought the car out in April and have driven roughly 2000km only since. I don't recall what oil I used. So I had the oil and filter changed and used Motul 8100 5w40 since it seems recommended by many S owners and he had it in stock. The rest of the day the car sounded fine, no more noise until later when I decided to push the car a little on the highway. Afterwards, when at a stop at idle I started hearing a new rattle.
Clip 1. Engine. The engine running recorded from the bay with open hood, allowed to warm up a few minutes. Seems fine.
https://www.dropbox.com/s/lyvvmjeu85...12-40.m4a?dl=0
Clip 2. Rattle. The rattling noise. Recorded at the same time as engine running from under the driver side rocker panel. You can hear the rattle. Engine is idling.
https://www.dropbox.com/s/ovdpac1191...14-00.m4a?dl=0
I did some reading on here and there are so many things it sounds like it coud be: TCT, Valves, exhaust hangers, rod bearings (please no). I really appreciate it if some experts could chime in before I go to my tech again. I'm not driving it right now out of fear.
Best,
Lyndon
**Update
The noise is coming from the catalytic converter. I didn't take it apart but it sounds like a piece has broken off inside and depending on where it's sitting, it will vibrate and rattle against the housing. I'm going to leave it alone until I either decide to put a straight pipe on, or replace the catalytic if/when the car starts throwing related codes.
I was wondering if you could take a listen and give your input on what you think this might be.
Background:
'01 124k km, no engine mods other than K&N intake kit. I recently started hearing a scratchy clicky noise with the window down, resonating from under the car and off the curb on initial throttle and deceleration. I don't drive the car much and I finally got around to taking it to my tech yesterday. It turns out, I was really low on oil. Maybe 1.5L came out when changed. It's strange because I changed it before storing last winter and brought the car out in April and have driven roughly 2000km only since. I don't recall what oil I used. So I had the oil and filter changed and used Motul 8100 5w40 since it seems recommended by many S owners and he had it in stock. The rest of the day the car sounded fine, no more noise until later when I decided to push the car a little on the highway. Afterwards, when at a stop at idle I started hearing a new rattle.
Clip 1. Engine. The engine running recorded from the bay with open hood, allowed to warm up a few minutes. Seems fine.
https://www.dropbox.com/s/lyvvmjeu85...12-40.m4a?dl=0
Clip 2. Rattle. The rattling noise. Recorded at the same time as engine running from under the driver side rocker panel. You can hear the rattle. Engine is idling.
https://www.dropbox.com/s/ovdpac1191...14-00.m4a?dl=0
I did some reading on here and there are so many things it sounds like it coud be: TCT, Valves, exhaust hangers, rod bearings (please no). I really appreciate it if some experts could chime in before I go to my tech again. I'm not driving it right now out of fear.
Best,
Lyndon
**Update
The noise is coming from the catalytic converter. I didn't take it apart but it sounds like a piece has broken off inside and depending on where it's sitting, it will vibrate and rattle against the housing. I'm going to leave it alone until I either decide to put a straight pipe on, or replace the catalytic if/when the car starts throwing related codes.
09-18-2014, 03:58 AM
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