how to get rid of fuel igniting in exhuast

[Unrivaled7]

i find it very annoying everytime i let off the gas pedal i hear a backfire, or fuel igniting because its running rich. im trying to figure out what could cause it to be running rich and how i can take care of this problem. any suggestions?!?!

[VMPhil]

according to Wiki:
Exhaust system backfires occur in engines that have an emission system malfunction, like an air injection system diverter valve problem, an exhaust leak, or when the catalytic converter has been removed. In some high-performance vehicles, when a driver shifts up and lets off the accelerator, the engine has a moment of running rich. This causes an incomplete burn which causes the fumes to explode in the exhaust system along with an audible clacking sound. However this condition is a result of working smog equipment, and is unlikely to cause any damage.

A fuel injected engine may backfire if an intake leak is present (causing the engine to run lean), or a fuel injection component such as an air-flow sensor is defective.

Common causes of backfires are:

* Poor or unregulated engine timing is often a cause of intake backfires, but can also be responsible for exhaust backfires
* Improper wiring in the ignition can also lead to timing issues and backfires
* Low fuel pressure, clogged fuel filters, and weak fuel pumps could cause a severe lean air-to-fuel ratio during fuel injection
* Missing or damaged catalytic converter can result in backfires out the tailpipe

I know from experience the the SE-R from the factory runs rich in general to prevent knock. Unfortunately there is no real way to retune the engine from doing so (at least on the aftermarket side). so perhaps one of the reasons above may be the culprit.

[PapaSmurf2k3]

My first guess would be dirty MAF/O2 sensor or vacuum leak somewhere. Have there been any modifications to the car?

[Unrivaled7]

i cleaned my MAF sensor not too long ago. however i havent bought new O2 sensors yet but im in the process of doing so. the guy i bought this car from so it didnt have a cat converter but when i looked under the car it looks like there is but it sounds hollow when i tap it. so im guessing maybe he gutted it, but i cant tell. so i have a cat converter waiting to be put on, but i was gonna try replacing the O2 sensors first so i dont waste money.

[SER Wes]

First if you are still running the stock exhaust manifold you need to replace it with an aftermarket header asap. It will break up and destroy your engine and you should no longer have a warranty so nissan will do nothing to help you. If it is gutted then you might be fine but check to make sure.

Also locklite your butterfly screws in your intake manifold if you have not. They will also come out and destroy your engine

Sorry i dont know how much you know and just covering all the bases

For the rich problem:
If it is nothing wrong with the engine/electronics, you could always get an safc and tune it leaner so it will not have the backfiring. You will get better performance too.