SDalt404

I just gutted my cat and added a catback. Now sometimes when I let off the gas after some RPMs I get a pop or a backfire. Would this be consistant with a lean condition? If so whats the first step to tracking this down?

__________________
1988 GTA / Gunmetal Grey / 5pd / Digital Dash

Mods:
SLP CAI / SLP Runners / Ported Accel Base / Ported Upper / BBK Pullies / Edelbrock Catback / 24lb Injectors

rad8tion

I get the same thing, pretty sure I am running rich

Ryan

__________________
92 rs convertible 5 speed 3" Flowmaster exhaust Catco cat crane fireball hi6 ignitionand LX92 coil, K&N air filter Bilstien shocks and struts Lakewood LCA's 350+.030" Vortec heads .528 INT .544 EXH 270 281 duration 112 LSA cam Edelbroct TES headers GMPP RAM JET run on an EBL computer Centerforce dual friction clutch AFPR 3.43 w/ Zexel Posi WC T-5 With G-FORCE kit, DENNY"S HD drive shaft, walbro 255 hp fuel pump, mini starter, LS1 Front Brakes 17" gunmetal ZR1 wheels Goodyear F1 GS-D3 tires

RBob

Most likely an exhaust leak.

RBob.

__________________

www.DynamicEFI.com

'92 Camaro in Dark Green Gray Metallic

Rebuildman

Is this pop or backfire in the exhaust? If yes, I would have to say raw fuel in the exhaust when you let of the loud pedal. It is being lit by the hot pipes. I have seen mufflers blown apart this way.

???

if your smog pump is still hooked up blowing air into the exhaust it will cause that. if not, exhaust leak.

SDalt404

My smog pump is definately still hooked up.

???

time to by pass it if you don't have cats. there may be a way to change stuff in the chip so that its in its vented to the outside air mode all the time. but I wouldn't have a clue how.