How to Fix the Infiniti G37 Vapor Canister Rattle
How to Fix the Infiniti G37 Vapor Canister Rattle
If you are hearing an obnoxious rattling sound coming from the rear of your G37 over bumps, a loose factory vapor canister is likely the culprit. Fortunately, fixing this vibration requires minimal garage time and simple hand tools.
The Short Answer (TL;DR)
To fix a rattling vapor canister on an Infiniti G37, access the emissions components under the rear diffuser. The canister sits loosely on a metal mounting tab. By unbolting the 12mm bolt and adding foam tape or a 3M mounting square to the metal tab, you will eliminate the play and stop the rattle permanently. It takes about 30 minutes.
The DIY Process Overview
Underneath the rear diffuser of the G37 sedan and coupe, a set of emissions components is attached to the spare tire well. Access these by removing the rear diffuser, which requires a 10mm socket for the two nuts and three bolts, plus a flathead screwdriver for the two plastic retaining tabs. Once exposed, locate the main vapor canister.
The vapor canister is a black plastic box connected to three hoses. It is secured by a single 12mm bolt and a rectangular slot resting on a metal tab. This loose factory fitment causes the rattling noise. Remove the 12mm bolt, support the canister, and place a thick piece of foam tape or a mounting square on the top side of the metal tab.
Reinstall the canister and bolt to lock it down firmly. You can also add foam to the plastic hose catch bracket for extra noise prevention. Reinstall your rear diffuser, and the noise will be completely gone.
Why You Should Upgrade While You're In There
Since you already have the rear diffuser removed and are working right next to the exhaust system, this is the perfect time to upgrade your cat-back exhaust. The factory exhaust restricts exhaust flow and muffles the VQ37VHR engine note. Bolting on an aftermarket exhaust while you are under the rear of the vehicle will improve throttle response, increase horsepower, and deliver a more aggressive tone.
Recommended Upgrade: Performance Cat-Back Exhaust System
Frequently Asked Questions
Can I just remove the vapor canister entirely to save weight?
No, completely removing the vapor canister will trigger a Check Engine Light (CEL) and cause your vehicle to fail emissions testing. The canister is a critical part of the EVAP system designed to trap fuel vapors. Securing it properly with foam tape is the correct mechanical solution.
How difficult is this repair for a beginner?
This is an entry-level DIY repair. You only need a 10mm socket, a 12mm socket, a flathead screwdriver, and some double-sided foam tape. Any driveway mechanic can complete this job in less than an hour.
