Lloyd was right, is just under the plastic cover in front of the intake, you can miss it. I belive the plug in green color. I drove mine for thousands of milages with that thing making noise but after reding a post of someone's breaking off and doing some serious engine damage I decided to disconnected. so far no side problems and runs much quite!

[b]94/95 Montero SR "rockcrawler"
Riding on 37" MTRs