srpwr

I have a 95 nissan 240sx with a 02 LS1 w/ t56. My issue is... say Im sitting at a lred light and it turns green to go. My car will take of and drive fine but will back fire (Very Loud) a couple of times. What would cause this? Every thing is stock except the exhaust. That is Hinson long tubes into dynomax cats into magaflow mufflers. Thanks!

SMAX

iTrader: (11)

Is it backfiring through the intake or popping through the exhaust?

srpwr

Its popping through the exhaust. (LOUD) I mean this is not like a little pop its more of a huge BANG!!!

98blackSS

Inspect all plugs, wires and coil packs.. Has it done this since the swap or just started recently?

srpwr

Its done it ever since I had the exhaust put on it...so basicly it has always do it. Some guy told me tha it could be because I dont have an X pipe.

Pop N Wood

iTrader: (1)

an air leak in the exhaust will do that

You might be running a little rich too.

In fact, an air leak near the O2's will cause it to run rich trying to compensate.

98blackSS

As said above, check for air leaks too. Also make sure that a plug wasn't smacked/damaged during exhaust install. And as stated, an overly rich condition can foul plugs which will cause the backfiring too. A wideband scanner is a huge help here.. Should also be able to get a scan log and check how far it's trimming fuel too..

srpwr

Thanks guys. Im going to take it to TSP tomorrow to see what thier scan tool says. ill let yall know.