Question about 2006 Buell Firebolt XB12R

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XB12R Running Lean

I have the race kit/exhaust.  It seems to run quite lean at low speeds and especially when it is a bit cold.  I have zero experieance with tuning the ECM.  My question

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If I get the spy cable download some programs will I be able to adjust it myself?  What's the cure?no need to tune it. since you have an all buell racekit, the ecm is built for your exhaust & filter and should be running almost optimal.i would look into your coldstart and idle speed. maybe you temp sensor is acting up? if not...it may be time to take a reset...,,,

Posted on Nov 10, 2008

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1 Answer

How to adjust idle?


hot engine ?, cold or both,, EFI runs in 3 modes, cold ,warm and hot.

name it.

which engine option (displacement)??????



there is no idle adjust, that is the PCMs, job 100%, all the time.

Carbs are gone.

here is rule one for all EFI.

idle is the last thing to work correctly.

anything the causes a gross imbalance of engine power to engine load, under idle will cause , idle controls to fail.



low idling causes. (over 50 but, here ar basics)

1: AFR (air fuel mixture too lean) usually surges. (clogged or leaking injectors. or fuel pressure way to high)

2: air leaks, cause racing, so not that. (speed density car ,if is)

3: egr stuck open. low idle and misfire.

4: ISC stuck closed (IAC electric)

5: cam belt slipped, timing retarded, compression at 1/2 spec, and well, valve will bend soon....

6: CEL glowing running? can be in limphome, limp cancels Idle controls (in may cases) RTM read the FSM on DTCs.



if fails hot?, is hot = 180F temp or more? "thermometer time"

if not, the PCM goes , quite nuts.

Dec 23, 2013 | 2010 Honda Civic LX

1 Answer

Idle up down


hunting or surging ilde. name the 2 RPMS, low and high , is it hot or cold engine this issue.? 400rpm or 1000 or 2000 all are diff.causes.
no year, stated. so cant help.
but ill answer in the generic,
1: the ECU (got a carb,? )
the ecu controls idle speed at all times.
if not , there is a problem (you)
A: air leaks in the induction will make motor race at some point the ECU/ISC loses control. and hunts. trying hard to correct it.
b: egr stuck open idle too low, iSC cant correct it,, bad EGR.
c: engine EFI running way too leak starving for fuel so it hunts for 2 reasons < ISC hunting, and lean does that.
lean is gross power loss and opening throttle bogs the engine.
so is double bad. ISC makes it worse,

all this breaks down to 2 reasons.
1: ISC bad. in some way (gummed up. or restricted inside)
2: bad fueling or air leaks. vacuum leaks.

try answers , the hot cold question and the 2 speeds, of the hunt.
lowest rpm and highest of the hunted range of RPM.

Nov 23, 2013 | Honda Civic Cars & Trucks

1 Answer

Increase then decrease idle when engine is cold especially


cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
running summer fuel in winter (running old fuel?)
needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
surge , causes, on a tuned engine might be:
1: too lean. so lean the ISC can not control idle. rpm low, stalling
2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

especially?
well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

Oct 28, 2013 | 1996 Honda Prelude

1 Answer

When riding the bike all is good when cold. Once warm exhaust temps reach 700+ degrees and bike will not idle, will run with throttle. Oxygen sensor replaced by dealer and no effect. Bike has been in the...


Did they reset your TPS? some xb's require it to be reset from time to time. It will cause the issue your describing. Do a google search for buell xb tps reset. there is a good video on youtube from buellxb.com

Sep 21, 2011 | 2009 Buell Firebolt XB12R

1 Answer

Hello, My 2011 fatboy lo runs very hot. I have Vance and Hines big radius and screamin eagle stage one kit. It runs hot but it runs awsome. i wanted to put an oil cooler on the bike but was told to leave...


There's hot and there's too hot. Heat is one of the factors that shorten the life of an engine, especially an air cooled engine. You bike is equipped with the oil jets that help cool the pistons. If it were my bike, I'd take the bike to a known good high performance shop that had a dynometer, an exhaust gas analyzer, and a good mechanic that knew what he was doing with both the bike and the dyno. I'd have them run the bike up through the RPM range and check the fuel-air mixture ratio at various rpm levels. If the bike is running too lean, it'll run hot. Lean is mean but too lean is bad. The mechanic may can richen the mixture up just a bit, say from 14.2:1 to 13.7:1 and reduce the heat while maintaining the performance you want. It's worth a try.

Good luck
Steve

Jun 01, 2011 | 2011 Harley Davidson FLSTFB Fat Boy...

1 Answer

I have a toro snowblower with a 2 cycle engine. When it's just running under no load it seems fine(maybe a little too high of rpm). When it starts throwing snow it gradually slows down until it quits...


It sounds like it is running lean. Back out your carbuerator adjustment screws a quarter turn counterclockwise. These settings should be 1 and a quarter on low speed (closest to engine block) and 1 and a half on high speed (farthest from engine block). These are starting points the adjustment may vary a little eigther way. Never adjust for max rpms that is too lean and will cause engine failure. Hope this helps ya.

Dec 22, 2010 | Toro Garden

1 Answer

Hello I have a 1996 Suzuki DR-200 and recently put


G'day mate the 1st thing i would go for is float level then compresion if it does have the **** it wont take the fuel in , rules are if it has **** ( induction ) Squeeze (compression) Bang ( spark) and Blow (free exhaust) then it should go, if it was running to lean there is good chance it has a burnt exhaust valve which will greatly drop the compression/induction, also check the valve clearence. hope this helps

Apr 04, 2010 | 2000 Gas Gas EC 300

1 Answer

I have a 06 buell xb12r muffler install now runs like ****


there are a couple of options. one is the Buell "race ecm" the other is to use a software package like ECMspy to re-program the ecm. This has been gone over in-dept over at www.badweatherbikers.com. the power commander and other "piggyback" tuners do not work well with the buell, and your is almost certainly running very lean.

Oct 05, 2009 | 2006 Buell Firebolt XB12R

3 Answers

Backfire and popping after installing vance & hines longshots


Let me know via baxr09@yahoo.com.au if you get a solution, Mine is doing similar but mine is holding back at half throttle to, Wont rev high at all just chokes under load

Apr 17, 2009 | 1999 Honda VT 1100 C3 Shadow Aero

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