Popping/backfiring when letting off gas....

[grebesbakery]

I have a 2002 x1 with intake and Vance & Hines exhaust. When letting off the gas at times I get the nasty popping/backfiring. Is this bc I have the exhaust, intake and just the factory ecm? If I upgrade the ecm will that stop my issue? thanks guys!

 

[c818919]

Unburned fuel is the likely culprit. Tune the bike.

 

[chrispudd]

I was gonna contribute here, but then noticed it's an X1. Which i know nothing about. [smirk]

 

[dmp0001]

If its excessive it will be less with a tune but it will always happen from full throttle or higher rpms to closed throttle. Its just a feature of an old push-rod v twin. they all do it to some extent. Even my road-star warrior does it a lot on deceleration. There just aren't enough valves to transition efficiently. but a tune will help.

 

[NwRider]

I am waiting on my pipe to do my tune. I have an X1 and have read up a bunch on ECMspy. I located the software, bought a cable and am ready to go. The tuning guide makes it sound pretty easy. As easy as decreasing values (very little) in the decel field. I hope its that easy anyway.

Agreed - unburned fuel, need a tune.

 

[grebesbakery]

Nwrider, once you tune the bike let me know how it turns out.

 

[vroom]

If it's an exhaust pop, that's afterfire. While unburned fuel is the culprit, the cause is not necessarily a bad tune. It could also be a burnt exhaust valve. If that is the case the exhaust should suck in on the affected cylinder. You can test that by holding a flimsy piece of paper to the exhaust while the bike is running. Depending on how bad it is, it could rip the paper out of your hand.
I've not actually done this on a v-twin, but on a car, in general, it's a pretty solid outblow if everything is alright. If it's a so-so minor leak, it'll just flop back and forth a bit.

 

[NwRider]

Will do grebes... do you have a cable and the software? Happy to share the software with ya.

 

[anrkizm95]

I have a 2002 x1 with intake and Vance & Hines exhaust. When letting off the gas at times I get the nasty popping/backfiring. Is this bc I have the exhaust, intake and just the factory ecm

yes it is

 

[grebesbakery]

nwrider, the cord is on the way but I don't have the software.

 

[NwRider]

Pm me yer email... maybe I gots somethin for ya..

 

[grebesbakery]

Alright, I installed the Eric Buell race ecm.....reset the TPS and AFV using ecmSpy. The bike runs awesome, so smooth now. BUT now I'm having a issue with high idle when coming up to stop lights.

It sits little above 2k, sometimes it comes back down to normal idle but other times I need to take the clutch out and almost stall it to bring the rpms back down. I can't adjust the idle anymore or the bike won't even start when cold...

Any ideas guys?

 

[Iamarchangel]

Decel popping is one of my favourite sounds.

 

[jimijeans]

Not all the poping will go away. But it will get better.Now with a small amount of Tuning she will run fine.Decellaration will make ANY Engine pop upon letting off the fuel. Small moves on the Tuning and save your stock Ecm maps etc.. for falling back on in case of an opps deal.Keep a log of what you do when tuning and it will make you a better tuner for other Bikes you will have in your future.Have a good time and do a data log run before you start to retune it.This way you can compare your results.*Jimi

 

[martinwill]

i think there is a post on bad web where they say the EBR ecm cannot be altered with ecmspy and EBR dont do ecm's for tubers., but i might be wrong. You dont need a race ecm, you just load race fuel and timing maps onto your stock ecm with ecmspy, job done.