Thread: What is this part mounted on a '05 GTP supercharger ?

you could only be describing the evap solenoid. and its line runs back to the gas tank. not the brakes. that cap sounds like the ac lines to me.

and how do you think a small vac leak is causing misfires?

Originally Posted by Scottydoggs

you could only be describing the evap solenoid. and its line runs back to the gas tank. not the brakes. that cap sounds like the ac lines to me.

and how do you think a small vac leak is causing misfires?

Thank you very much. That is it !

- The cap is definitely on the vapor line near the solenoid. Yes, it is very similar to capped A/C schrader valves (I didn't want to touch anything at this point).
- Yes, following the line got fuzzy as it went down, and being integral to the brake lines made no sense to me at all.

- I have had misfires for a long time, and have tried many things. When I replace the o-ring on the valve, and the misfires stop. (Since the o-ring (Viton) hasn't been fitting very well, it gets squished out, and a leak must happen shortly after.) The leak here seems to be one of several that, in culmination, have sealed up vacuum leak problems. I now believe that vacuum leaks are a very big culprit to misfires that are easily glossed over (I know I did).

Thankyou again!