exhaust poping problem

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Aug 22, 2005 | 07:11 PM

customz28

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From: hopewell,ny

exhaust poping problem

i need some help please......i have a 99 z28 and i just put a loudmouth exhaust, slp intake, and i replaced the plugs.....the car sounds awesome and i love it except for when i let off the gas such as shifting gears it pops....i had my check engine light come on and the code was egr feedback signal out of range......i replaced the egr vavle and havent had it come bac since and the poping even sounds alittle better but it still pops now and then when i let off the throttle....is this normal and something i just have to deal with or is something wrong because the pops get annoying.....by the way it pops alot more when the motor is cold.....

Aug 22, 2005 | 07:18 PM

loser98

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From: carbondale, PA

i dont have a LS1 but i know the LM on the v6's "pop" alot when you let off the throttle quickly. its normal i gusse. i think any really free-flowing exhuast is going to rasp/pop ect.this is why ORY's rasp more than catted Y's do.

Aug 22, 2005 | 07:22 PM

Roarin_8

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From: Kissimmee, FL

The popping is normal, usually happens more at higher rpms and then letting off the throttle. Never had an SES come on for it.

Aug 22, 2005 | 07:30 PM

TAQuickness

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From: Houston

it's unburned fuel lighting off in your pipes. called RAZ

Aug 22, 2005 | 07:36 PM

customz28

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From: hopewell,ny

k thanks guess im just gonna have to deal with it

Aug 22, 2005 | 07:37 PM

Uno99

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From: Appleton Wi

You will always have some popping with the LM there is no Back pressure. However you may have cracked a spark plug when you changed your plugs. I did when I changed mine, and there was major popping. Turns out I cracked the ceramic on one of the plugs. I replaced it and the popping went away. Give that a try. However you will still have some backfires or popping with the LM any non restrictive cat-back reduces back pressure and will backfire on occasion. Good Luck let us know what you find out.

Aug 22, 2005 | 07:38 PM

black01_WS6

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From: Fort Myers, FL.

the pop is somewhat normal, depends on what exhaust setup you have. I have almost none, and my car is loud. you could be setting of you knock sensor, if its that loud.