Nissan 370Z Forum - View Single Post - Popping Sound Shifting Under Acceleration

HKYStormFront · 07-12-2012, 10:45 AM

yup^ i've got a 4.6 mustang that i'm taking care of for the summer for a friend and it's got some hellacious exhaust on it. normally when downshifting it makes nice burbling noises as it engine brakes but when it's cold it will actually back fire substantially. i was pulling out of my neighborhood the other day, revved it up to about 3k in 1st and let off and BOOM!!! scared the crap out of me. after it was warmed up, it doesn't do it. the 370 is a completely different engine though, i'd check with your tuner. sounds like you might be running way rich

07-12-2012, 10:45 AM	#6 (permalink)
HKYStormFront A True Z Fanatic Join Date: Apr 2009 Location: Greer, SC Posts: 14,954 Drives: 06 Frontier SE 6spd Rep Power: 52	yup^ i've got a 4.6 mustang that i'm taking care of for the summer for a friend and it's got some hellacious exhaust on it. normally when downshifting it makes nice burbling noises as it engine brakes but when it's cold it will actually back fire substantially. i was pulling out of my neighborhood the other day, revved it up to about 3k in 1st and let off and BOOM!!! scared the crap out of me. after it was warmed up, it doesn't do it. the 370 is a completely different engine though, i'd check with your tuner. sounds like you might be running way rich __________________ Patrick // 06 Frontier 6spd Nismosis // Mods: Uprev Tuned @ Z1 Motorsports: 257whp & 292 ft lbs 09 Pontiac G8 GXP // M6 // Sunroof // Tint... For now