Back fire issues

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Jun 24, 2008 | 03:53 PM

srpwr

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Back fire issues

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!

Jun 24, 2008 | 04:14 PM

SMAX

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From: TULSA

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

Jun 24, 2008 | 05:10 PM

srpwr

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Quote:

Originally Posted by SMAX

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

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

Jun 24, 2008 | 05:48 PM

98blackSS

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From: Lexington Park, MD

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

Jun 24, 2008 | 08:29 PM

srpwr

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Quote:

Originally Posted by 98blackSS

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

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.

Jun 25, 2008 | 05:42 PM

Pop N Wood

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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.

Jun 25, 2008 | 06:31 PM

98blackSS

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From: Lexington Park, MD

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..