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Backfire thru exhaust


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have a '95 pathfinder SE, been running great, but today i heard a slight backfire thru the exhaust when lifting off the throttle. i cleaned the MAP sensor, timing checks out good (holds steady timing), but also noticed a drop in gas mileage. all feedback is appreciated.

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Bad gas, dirty injectors, bat cat causing an issue. It could be several things.

 

Does it do it every single time you drive and take your foot off the gas?

 

Sent from inside my potato

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the back fire is not loud, but I always hear when decelerating. I sounds like it's coming from the engine sometimes, but most times it's from the tail pipe. this morning it starts to 'surge idle' when at a stop. Timing checked, MAP sensor cleaned, Lucas additive in gas tank. No check engine light, but will have that checked anyway. any ideas are good.

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Have you checked for vacuum leaks? Any unmetered air after the maf can cause idle issues because the computer doesn't know what to do since there's extra air but the throttle body is still closed, so it tries adjusting the fuel mixture adding to the surging problem.

 

When you drive like this the oxygen sensor is getting one reading while the ecu is telling the engine to do something different.

 

Check and replace all of your vacuum lines if you haven't already and also check the tube between the air box and the throttle body for cracks and splits.

 

Sent from inside my potato

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