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10-09-2004, 08:25 PM
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#1 | |
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AF Newbie
Join Date: Jan 2004
Location: Paramus, New Jersey
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Cat back problem
I've been searching the forums for anyone else have a problem like mine but i was unable to find it. Sorry if it has been addressed before. I have a 1989 240sx stock ka24e except injen short ram with a Tanabe Super Medalion Cat-back exhaust with 80mm piping installed about 2 months ago. At first it was making this popping noise when i was missing a nut connecting the exhaust to the catalytic converter. I got 2 new nuts and installed those snug. It was still making this popping noise so then i changed the spark plugs. After that it was still making the popping noise. This noise would come on wen i shift gears at around 3500 + rpms and during deceleration while i'm in gear it sounds like its making popcorn. When i'm idle and i tap the gas a little to get it to around 1100 rpms it pops a little also. Is it supposed to be like this or is there anything else i should do? Any response would be greatly apreciated thank you.
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10-09-2004, 08:47 PM
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#2 | |
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AF Enthusiast
 Join Date: Oct 2003
Posts: 728
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Re: Cat back problem
maybe it is the back pressure....that is what it seems like.
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Hiya... Need a FSM? Hit me up I'll send it to ya for FREE! I only have the 91-98 240sx, s13 ca18det, and s14 sr20det FSM Sorry no 89-90 yet.... Mods: Tein Flex with EDFC Hotshot Header R32 GTR Seats Advan SA3 16x7 16x8 Apexi Dual N1 Exhaust Silvia Front End Conversion Digital Climate Control Nismo 2-Way LSD Injen Intake w/ CAI 
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10-09-2004, 09:00 PM
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#3 | |
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yada yada yada
Join Date: Apr 2003
Location: Seven Hills, Ohio
Posts: 2,928
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Re: Cat back problem
its called "backfire". its normal.
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438whp / 373tq - 11.9 @ 126 
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10-09-2004, 11:05 PM
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#4 | |
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AF Enthusiast
Join Date: Sep 2004
Location: state college, Pennsylvania
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Re: Cat back problem
Yup, like they said. Backfire... it's just excess fuel-air mixture combusting in your exhaust system creating a "popping" noise.
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10-10-2004, 12:07 AM
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#5 | |
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AF Enthusiast
Join Date: Nov 2003
Location: MCcalla, Alabama
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Re: Cat back problem
yeah my N1 does that no big deal
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See ya.... 
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10-10-2004, 12:46 AM
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#6 | |
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AF Enthusiast
 
Join Date: Mar 2004
Location: Los Angeles, California
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Re: Cat back problem
yea like they all said backfire. i was freaking out when i heard it but now i dont. its fun sometimes. i need 2 get an exhaust mine is a welded on one dual tip i need 2 get atleast one of those fake ones for awhile that cost like $50 almost close 2 getting a n1 but not there yet.
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