when it idling i can hear it make pop pop sound consistantly. is this normal? and whenever im at high rpms and shifting to the next gear it makes a loud backfire noise, is that pretty normal? and yes the car is tuned

set up-
3in open downpipe

 

i think you may want to check out the popping noise at idle

its pretty normal for it to do it when you are shifting like that, but not at idle

 

at idle its not nearly as loud as when im at high rpms shifting, at idle its only small, quiet, puffing noises

 

ya my untuned booberdata setup did that. little puffs at idle. Always wondered why but never cared enough to try and fix it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ratboy &raquo;</TD></TR><TR><TD CLASS="quote">
at idle its not nearly as loud as when im at high rpms shifting, at idle its only small, quiet, puffing noises</TD></TR></TABLE>

well, the small puffs might be nothing to worry about.

can you hear them while you are sitting in the car, or from only outside the car?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Evanmb44 &raquo;</TD></TR><TR><TD CLASS="quote">

well, the small puffs might be nothing to worry about.

can you hear them while you are sitting in the car, or from only outside the car?</TD></TR></TABLE>

both... is that bad? what could be the problem?

 

is it constantly or only sometimes?

 

My cars pops like that (not at idle) also, but it isn't a problem with misfiring, its not problem at all.

 

my car pops at idle i think its cause of my big *** injectors trying to idle the car

 

so the backfire at high rpm's is normal right? thanksguys

 

yes with open downpipe pops at high rpm most likely come out as fire

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vaporboy12 &raquo;</TD></TR><TR><TD CLASS="quote">yes with open downpipe pops at high rpm most likely come out as fire </TD></TR></TABLE>

i don't know if that's what you consider "normal".. that means there's fuel combusting in or near the turbine?

 

backfire is just unburned fuel thats all nothin to worry about.

 

Sounds like it's just lightly misfiring at idle. Big injectors do wacky things. Might want to check the tuning at idle if it bothers you. Richening up idle a little from 14.7:1 can smooth things out sometimes with big injectors.. like 14:1 or so. (assuming not using closed loop o2).

 

thanks for all the responces

 

mine is like that at idle as well. My idle afr is around 15.1:1