jason2687

iTrader: (2)

Since I've picked up my '02 ls1, I've noticed some backfiring issues and I'm not really sure if this is normal or what....

It's usually on a higher rev right when the rpm drop during a shift. Also, it will sometimes backfire on a cold start. I have a long tubes, no cats, true duals, and a diablo tune.

I've heard that this is sometimes normal on the '02's, but I'm not entirely sure. Does anyone have any experience with this same problem? What would usually cause this to happen?

conor.davis

iTrader: (20)

Mine will do it sometimes right after I get into it a little and let off..

180ls1

iTrader: (4)

i dont think it is really ever normal for a car to backfire, try unloading the diablo tune and see if that effects it.

ls1 1990 VN

Mine does it, worse when cold, on backing off & after hard full Throttle and back off, it will back fire due to over run of unburnt fuel & open 3.5" exhaust

Michael02hawk

iTrader: (26)

Nope! Not normal at all.

SLP4CamaroSS

iTrader: (16)

most likely you are running lean

Steve Gunn

Do you have an exhaust leak near the manifold?

omarrakeen

iTrader: (2)

mine used to do that after reving or leaning from high rpms.

jason2687

iTrader: (2)

I have thrown an 02 sensor code when i first got the code, but the code went away after clearing it with the diablo tuner. Do you think an 02 problem might be the reason for the backfire issue even though I'm not throwing any codes?

libertyforall1776

iTrader: (2)

Are you plugs/wires due for a change? Try NOID testing your injectors -- I had a problem on my old 3.4L Camaro where an injector was intermittent electrically, and then failed and I had the backfires during that scenario... Any codes?

jason2687

iTrader: (2)

I have no codes as of now, they went away even though I never changed the O2's (which is why the codes were being thrown). Could I have fouled out the plugs or injectors by driving while these codes were being thrown?

My car has only 9000 miles so this is the only thing I can think of....

PassoutWilly

My 02 backfires as well. It's not that bad though just sounds like bad rasp, I never thought anything of it.

zamora7

iTrader: (4)

leaky injectors?

madmike9396

iTrader: (29)

my 01 does the same damn thing pisses me off i have lm1 when i shift from 3-4k it will pop out the exhaust and does it bad when cold and some at WOT ive had the tuned lookes at so i guess its the exhaust getting old