I am stumped

[lonnibdd]

OK Gents and ladies I have a 08 gs 11,500miles. I had Tb dual and plain JB put on before I even rode it as I have a prostetic leg and have to put a hand brake conversion put on so I never rode it stock but dealer toke me it ran like a top. So last yr and this year same problem. O i have a k&n filter as well. Between 3&4000 rpm VERY VERY noticable miss and when cruising at low rpm in town and then ever so slightly feather the throttle up pretty bad hesitation and back fire around 4 grand. I have tried all setting on jb box shut off no difference rich and lean both worse all lights on jb box are working correctly. we all know how great gas is today but even so i have super clean pipes which would leave one to believe its lean but when richened pops and backfires put new plugs in old ones looked great but if its only doing it at one range and im not there al the time plugs wouldnt show it. I am soooooooo stumped please help. It is making riding not fun. like i said it has a bad hesitation and when i richen it hesitates worse and same other way could be bad jb box? welcome all ideas. THanks folks Bill T.

 

[nudle]

:dontknow: maybe try and 02 modifier.

 

[Firefly]

:dontknow: maybe try and 02 modifier.

:agree:

JB is pretty blinking lights for the most part-- O2 mod does more IMO.

 

[WackyDan]

Have you looked for an intake leak? Maybe the evap canister hose? Is the purge valve still plumbed in and working correctly? Are the exhaust headpipes tight? Slipjoint gaskets good?

If it was good once, and now it's not, and you didn't change anything, I doubt if the problem is fuel mapping..........

Are your plugs toast? Would be another one... along with coil and plug wires.

 

[fastfraser]

Had the Hindle, juice box and K&N air filter with backfiring on decel. Once I added the O2 modifier all was well .:dontknow:

 

[lonnibdd]

bones, dan, firefly, first thanks for input. Plugs good brand new. when i mentioned dealer said was running top that was bone stock before filter, duals, and Jb. I have not checked for intake leak and few other things metioned will give me some avenues to check. I am going to wait another day and I should have my 02 mod at door step and put on and see form there. When i had apart this winter was alot of oil in box, I have been using my spyder.com bible to look at threads and might put a filter in vac line. whats is best way to check intake leaks shoot VERY small amout of starter and see it hear motor rev diff? how do these beasts run with bottle top filters? understanding I need to correct one problem before explorering others.

 

[docdoru]

Between 3&4000 rpm VERY VERY noticable miss and when cruising at low rpm in town and then ever so slightly feather the throttle up pretty bad hesitation and back fire around 4 grand.

Did you check the vacuum lines? :dontknow:

 

[Campverdefela]

Have you looked for an intake leak? Maybe the evap canister hose? Is the purge valve still plumbed in and working correctly? Are the exhaust headpipes tight? Slipjoint gaskets good?

If it was good once, and now it's not, and you didn't change anything, I doubt if the problem is fuel mapping..........

:agree:Especially if no exhaust leaks, then the 02 Mod should take care of it...

 

[napper39]

the 02 mod like every body else told you about it mad mine run grate,but dont forget the little things that might be the problum ,tight batt wires and relays pushed in tight.these being loose can do just what you described.just my in put.:chat:

 

[Firefly]

Good call on ordering the O2 mod. Just plug her into the JB where the OEM cable from the sensor plugs in. Best to use the plug they give you as running the sensor without having it plugged in can fry it.

Once you go with the O2 -- you'll probably never go back....:thumbup:

The O2 mod will make more of an improvement than the JB does.

 

[Firefly]

Dozens of us out here (many of whom do a lot performance riding - Doc - Seth-Jedd-Myself) have found that the o2 mod makes a SIGNIFICANT improvement compared to just having the JB.

In fact, I'd put a Spyder with just an o2 mod up against one with just the JB any day of the week.

So either trust those that have actual HANDS ON experience using the o2 mod -- or trust the one that has never used one and doesn't ride a spyder anyway.... your choice.....

Asking an HD owner for their opinions on Spyder performance is like asking your garbage man how to perform brain surgery.....:roflblack:

 

[ataDude]

...Asking an HD owner for their opinions on Spyder performance is like asking your garbage man how to perform brain surgery.....:roflblack:

Yet another.

.

 

[boborgera]

whats is best way to check intake leaks shoot VERY small amout of starter and see it hear motor rev diff? .

Absolutely NO STARTER FLUID :lecturef_smilie: If you have to go that route, Use WD 40

 

[jedd]

If you need an o2 mod to get your JuiceBox to perform correctly, your JuiceBox was never adjusted properly..........

Installing fuel mapping modification devices, and using them correctly are two different things

Respectfully:agree:

Dozens of us out here (many of whom do a lot performance riding - Doc - Seth-Jedd-Myself) have found that the o2 mod makes a SIGNIFICANT improvement compared to just having the JB.

In fact, I'd put a Spyder with just an o2 mod up against one with just the JB any day of the week.

So either trust those that have actual HANDS ON experience using the o2 mod -- or trust the one that has never used one and doesn't ride a spyder anyway.... your choice.....

Asking an HD owner for their opinions on Spyder performance is like asking your garbage man how to perform brain surgery.....:roflblack:

Sorry Bro I gotta disagree on this one, I have no O2 modifier as I have always thought it would defeat the purpose of a fuel management system. I do not disagree that many have had great luck with O2 manipulation. For me I have done all tuning with plain old JB I need to adjust it from time to time, still think the ECM can compensate it out of the loop after time, or the JB just needs woke up every so often but for me I will always try to leave the O2 sensor in place.


As to the original post, "Y" pipe gaskets my first assumption. Next ? do you have aftermarket HID head and fog lights. If so I have a ballast on 1 fog that will intermittently put a static buzz in the circuit and make my JB loose its mind, no big deal it just reverts to stock when this happens so I just have to re-set the JB to my settings.

Jim:thumbup:

 

[jedd]

In fact, I'd put a Spyder with just an o2 mod up against one with just the JB any day of the week.

Actually you unknowingly have 2 years in a row at Cuba.

Sorry man couldn't resist

Jim:thumbup:

 

[Firefly]

Actually you unknowingly have 2 years in a row at Cuba.

Sorry man couldn't resist

Jim:thumbup:

:roflblack:

Good one..... did we run this year?
You know as well as anyone that a good start off the line has more impact than the various mods we have all done on these beasts (within reason).

You might be surprised how much better you could run with the o2 mod-- the JB can only do so much -- and doesn't do nearly enough (if it did why would they have needed to come out with the pro version ). Not to mention the JB still has that glitch on the accel vs. WOT settings if you have them too close the engine will cut out when hammering it to WOT. Many of us experienced that problem - even though TB (who doesn't make either unit) denies it exists.

I would also note that TB ordered an o2 mod and used it for 30 days during their 'tweaking' of the JB prior to it's release--- then returned it to Ken to get their $89 back. Seems they wanted to mimic much of what the o2 mod was doing.

I'll bet when lonnibdd adds the o2 mod his problems will disappear - barring anything like a Y gasket leak.

I'll respect your opinion on this far more than an HD :cus: that doesn't even ride a Spyder though.....

I'd like to go with a PC with the AFR if they ever get the kinks worked out.

 

[Campverdefela]

Respectfully:agree:



Sorry Bro I gotta disagree on this one, I have no O2 modifier as I have always thought it would defeat the purpose of a fuel management system. I do not disagree that many have had great luck with O2 manipulation. For me I have done all tuning with plain old JB I need to adjust it from time to time, still think the ECM can compensate it out of the loop after time, or the JB just needs woke up every so often but for me I will always try to leave the O2 sensor in place.


As to the original post, "Y" pipe gaskets my first assumption. Next ? do you have aftermarket HID head and fog lights. If so I have a ballast on 1 fog that will intermittently put a static buzz in the circuit and make my JB loose its mind, no big deal it just reverts to stock when this happens so I just have to re-set the JB to my settings.

Jim:thumbup:

I disagree with your disagreement, and therefor agree with Firefly. Like him I have a free flow intake and with the extra breathing it needed the 02 mod. assuming you just have the better filter and not the intake setup. However every machine is different and this forum has proved that many times over.

 

[jedd]

Oh I don't disagree that many are noticing great improvements with the o2 modifier, I'm simply stating I'm of the same opinion as HDX on the subject of it being needed, but I don't think anyone running a o2 is wrong in any stretch. For me it is a matter of opinion and mine is to keep the fuel management system intact as much as I can and still get performance gain with JB. I will grant you that I for sure have to tweak JB more than others with a o2 added. I am not running a full open intake, I have modified my airbox and a green filter. A full open intake may very well enough to push it over the edge of too lean without a o2 modifier.

And yes we ran last year also with same resultnojoke

Jim:thumbup:

 

[jedd]

Power Commander with Auto-Tune would be the hot set-up, but I think us with 2008's are screwed the info I'm getting is they tested for 09' &10' and initial maps on 08's both PE and Production are different enough PC makes no promise as to the compatibility to the 2008 models:gaah:

Isn't yours a 08 Dan?

I'm considering trading in the fall just for this reason hardware that is unable to be manipulated.

Which goes back to the o2 thing, if we could fully manipulate the fuel curve there would be no need for a o2 mod.

Auto-Tune adds a o2sensor for the PC to read its own AFR and adjust accordingly. Awesome theory hope they keep working on it.

Jim:thumbup:

 

[sabunim5]

A different thought

With your mileage, your exhaust gaskets are due to be replaced soon and many have crapped out before the 12k mile replacement spec. Bad exhaust gaskets will cause backfire in a heartbeat. The Honda gaskets are the way to go on replacement.