dwhite645

Ok, some of you might remember that I installed a Mac Off road H pipe last week, and ever since then I can feel and hear a noise coming from the drivers side, on the floor. It sounds as though someone is underneath knocking on my floor board with knuckles, best way I can describe it. The vibration even travels through the gas and clutch pedal. It only happens while lightly accelerating, both when I'm letting the clutch out, or it's already all the way out. It's also not regular. Sometimes it happens, sometimes not. My first thought was clutch, but it's fine, just like before. My second though it the H hitting the floorboards while the engine torques a little, but this doesn't make sense since it doesn't happen while accelerating hard, only lightly. Did something come loose, because it happened on the first drive 5 minutes after the H pipe install. Has anybody else experienced something similar? What should I look for? Thanks a ton for any help.

USAMuscle

Check the clearance between your front O2 sensor and the floorboard. Some pipes place the sensor so close to the floorboard it can cause a problem. Just a thought. The engine shakes a little more at lower RPM's, so it could be the end of the sensor tapping the floorboard.