The little bolts on the y-pipe, why are they there?

[NoJive]

Just noticed in the past week that my Spyder was running rough/backfiring/stuttering, etc. Just replaced the exhaust gaskets a couple weeks ago, but was thinking perhaps one of the clamps may have came loose. In my checking, I noticed one of the little bolts/plugs that are in the bend on the Y pipe was missing. I had something similar that I screwed in until I can get a proper replacement, and the Spyder runs smooth once again. But, that got me to wondering what their purpose is?

 

[NancysToy]

Did you remove the O2 sensor, or are you talking about above that, in the split portion of the pipe? Hard to tell where you are looking without a picture.

 

[mcaccamise]

Doesent sound like just a bolt would make a difference in running must have been some other plug or O2 that came out? Need some picks to sort it out for u.

 

[Chupaca]

Let's see..!!

there are some little bolts I believe are drains...if you lost one could bring on the backfire again but should not cause the roadster to run bad...:dontknow:

 

[ivanlee]

Just noticed in the past week that my Spyder was running rough/backfiring/stuttering, etc. Just replaced the exhaust gaskets a couple weeks ago, but was thinking perhaps one of the clamps may have came loose. In my checking, I noticed one of the little bolts/plugs that are in the bend on the Y pipe was missing. I had something similar that I screwed in until I can get a proper replacement, and the Spyder runs smooth once again. But, that got me to wondering what their purpose is?

That is a port for checking the back pressure in the exhaust system. hyea:

 

[boborgera]

They're called Hex plugs, 10mm. Used to monitor emissions, With an exhaust sensor..
Totally useless for the owner......

 

[NoJive]

They're called Hex plugs, 10mm. Used to monitor emissions, With an exhaust sensor..
Totally useless for the owner......

You are probably right! I can tell you when one is missing, the Spyder runs just like the gaskets are bad. Here is a pic of said bolt/plug:

 

[Sarge707]

You are probably right! I can tell you when one is missing, the Spyder runs just like the gaskets are bad. Here is a pic of said bolt/plug:

View attachment 69353

Thanks, I,m going to keep this in my sub-conscious for future use if needed!:clap: