im having some problems after new muffler(flowmaster 70) and intake kit(k&n air charger) installed
i installed muffler first then intake few days later
with new muffler, when i stop rpm goes down to about 900 then goes up to about 1100 then goes down to idle
im not sure if its normal or not, but i dont think my WK did this before
when rpm jumps, i could hear that new rumble
i just assume that it will go away after few days once car get used to new muffler
well, i installed new intake and it gets worse
it happens in 2 ways
1. when my A/C is off, during accelerate from stop.. but it goes away within 5 sec
i do have that new hissing sound from intake, but it new baby hissing sound..
its like high pitched electrical sound
this sound is not that loud, but still noticeable with window open
and when my rpm jumps(explained above), it gets louder and i can hear it clearly
2. when my A/C is on, i can hear hissing sound through vent as i accelerate from stop, and it goes away in 5 sec
but i can hear it again if i push the gas slightly, but it goes away once i let it go
but during heavy acceleration, i cant hear it
also when rpm jumps, i can hear this hissing sound through vent
i checked my local dealer, they said something on expansion valve is blah blah.. well, ill get a new part installed tomorrow, but i know its not A/C problem
local shop said some air vent under dash is bad.. i dont think so..
im sure avg. mileage went up a little with exhause and intake mod in most of case, but i just noticed mine actually went down a little
i tried to figure it out whats wrong for few days, but no bite..
i checked muffler, its not installed backwards.. and it doesnt have any leak
possibly MAF sensor on intake tube might be messed up during new intake installation, but i dont get any error code
#16,17,18,19,20 on this thread http://www.jeepsunlimited.com/forums...d.php?t=816142
i saw guy at muffler shop cut that thing when he install new muffler
what that thing do exactly?
vacuum leak? iac motor? belt?
i was gonna just drive since is not that loud it but it started bugging me now
tried to pinpoint this for a week now.. cant really think of anything.. everything seems just fine..
any thought on this?
appreciate it in advance
whoever pinpoint it exactly will receive small gift from me!!!!!!!
its 2005 4.7L by the way
double posted on JU.. sorry if someone mind double posting