When I am light on the throttle I can hear real light popping sounds coming from the exhaust. I never heard this before I was tuned. New plugs put in when tuned as well. It does not make any popping when WOT or anything. Just when hardly on the gas but still giving it a little. Makes a little different sound on engine braking.
I always thought the exhaust popping would be from running rich, but when I got it tuned it got leaned out not richened.
Anyone experience this before? I searched around on here and it seemed like everyone was having it under engine braking or WOT shifts etc.

 

I was getting something similar after installing an eManage (car is NA setup). It didn't have to be WOT and I would get an occasional pop. It would happen more often only when the car was warmed up. In order to test we would have to let the car idle, wait for the fan to kick on. Ends up the car didn't really like just a small amount of timing advance, if we used more it was OK. Not sure why this was the case.

 

Backfiring ftw.

 

But why would it backfire only once it got leaned out? Doesn't make sense to me. Unless when tuning with a vafc since it doesn't hold the tune I guess only does for WOT would that cause it to actually run rich partial throttle?

 

After tuning for WOT, the oem partial throttle tuning gets distorted (you canging the signal to ecu still) that causes the car run a bit rich on descel sometimes.....this is not a big deal.....unless you still have the cat. on.

 

Took the cat off after a few thousand miles.

 

What if I put an aftermarket free-flow cat? Would it help the popping?

 

So when you install a v-afc you can only tune your WOT map? That explains it.. Seems pretty silly to me unless you drive at WOT all day.. Hondata/EMS ftw.

 

Well you can tune partial throttle, but the ecu will re learn it's stock settings. So you need to reset the ecu every once in a while to keep the tune for partial throttle.

 

thats only an issue if you have larger injectors. I wouldn't worry about the partial throttle tune stuff as the o2 sensor does a good job of getting the best fuel mileage. in regards to the popping as a earlier poster said, its reinterpretting the map sensor signal, so there will be occasions where it doesn't do it right.