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post #1 of 16 Old Feb 19th, 2009, 8:50 pm Thread Starter
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GT O2 sensor

Tired of problems with hesitation and roughness below 5K rpm and BMW's lack of help concerning it? I have been living with the problem for the last 30K miles. I felt it should be a warranty problem and should be fixed. I went for a ride today and could not take it any more. I stopped at Napa and bought a new O2 sensor. Part number 15730. It was 64 bucks plus tax. It came with bare wires(no plug). I spliced her in and went for a ride. She rides so much better now. I wish I would have done this a long time ago. So, If your thinking about it, Just do it! Thanks to Ken, Grif, and others for the info on this.

Brian Ley
WA State of mindless sheep
USA where everything is illegal
2007 K1200GT
2010 650GS
2000 k1200LT Sold but not forgotten
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post #2 of 16 Old Feb 19th, 2009, 9:51 pm
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Re: GT O2 sensor

Quote:
Originally Posted by sanjaun2
Tired of problems with hesitation and roughness below 5K rpm and BMW's lack of help concerning it? I have been living with the problem for the last 30K miles. I felt it should be a warranty problem and should be fixed. I went for a ride today and could not take it any more. I stopped at Napa and bought a new O2 sensor. Part number 15730. It was 64 bucks plus tax. It came with bare wires(no plug). I spliced her in and went for a ride. She rides so much better now. I wish I would have done this a long time ago. So, If your thinking about it, Just do it! Thanks to Ken, Grif, and others for the info on this.
After installing the new O2 sensor and doing the TPS reset the bike was perfect. After the bike overcame the TPS reset it was good, but not there yet. I installed the Power Frk sometime before Christmas and the fueling has been spot on ever since. It works off the temp air sensor on the airbox. I haven't been jumping up and down in joy yet, as I haven't ridden the bike in hot temps. If this fix works in the heat, I'll be screaming it.



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post #3 of 16 Old Feb 19th, 2009, 10:29 pm
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Re: GT O2 sensor

Grif....Im interested in your review of the FRK in hot weather....let us know how it turns out, please!


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post #4 of 16 Old Feb 20th, 2009, 7:46 pm
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Re: GT O2 sensor

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Originally Posted by Florian
Grif....Im interested in your review of the FRK in hot weather....let us know how it turns out, please!


F
Most definitely. The older LT's suffered from hesitation in hot weather and unplugging the air box temp sensor enventually even became a BMW fix. Pioneered right here on this board.



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post #5 of 16 Old Feb 20th, 2009, 11:19 pm Thread Starter
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Re: GT O2 sensor

Grif,
I went to power RFK's website and could not find any perticulars like how it works and gains in HP and torque. Their graphs looked like a snake instead of smooth and straight. Give us so more info aye.

Brian Ley
WA State of mindless sheep
USA where everything is illegal
2007 K1200GT
2010 650GS
2000 k1200LT Sold but not forgotten
BMWOA 119892
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post #6 of 16 Old Feb 20th, 2009, 11:46 pm Thread Starter
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Re: GT O2 sensor

I found the info on how it works, But looking at the different model dyno's I noticed that in some cases the power was lower than stock. I need a better sales pitch.

Brian Ley
WA State of mindless sheep
USA where everything is illegal
2007 K1200GT
2010 650GS
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post #7 of 16 Old Feb 21st, 2009, 1:21 am
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Re: GT O2 sensor

Quote:
Originally Posted by sanjaun2
I noticed that in some cases the power was lower than stock.
I heard the same thing about some of the later BMW software updates. But do you really need more power, or a smoother, more consistent throttle response? Some GT's are mildly jerky, some are massively so. If yours is OK, then leave it alone. If not, then this is one possible solution to the various flat spots and sloppy idling.

Besides, even if you find another 10-15 HP somewhere, you'll still not be able to keep up with me & Grif.

Ken
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'03 Anthracite Metallic K12LTC, 66K miles
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post #8 of 16 Old Feb 21st, 2009, 7:00 am
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Re: GT O2 sensor

Quote:
Originally Posted by sanjaun2
I found the info on how it works, But looking at the different model dyno's I noticed that in some cases the power was lower than stock. I need a better sales pitch.
I haven't really noticed any horsepower drop, or gain, then again, I did the stepper motor mod at the same time. My first impression was a bit more vibration was noticed in the handlebars. It either went away, or I got used to it.

The nice thing about the PowerFrk is it simply plugs inline with the airbox temp sensor, so if it ends up not working in the hot, it can be unplugged. Though it really wouldn't matter, I fear no solder.



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post #9 of 16 Old Feb 21st, 2009, 8:27 pm
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Re: GT O2 sensor

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Originally Posted by meese
But do you really need more power, or a smoother, more consistent throttle response?
Well, having just ridden an '09 GT, I can say for certain that it is entirely possible to get both.

Ken
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'13 Dark Graphite Metallic K16GTLD, 24K miles
'09 Magnesium Beige Metallic K13GT, 63K miles
'03 Anthracite Metallic K12LTC, 66K miles
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#143, IBA# 366, MOA# 111996, SCMA# 24032


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Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...
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post #10 of 16 Old Mar 27th, 2009, 6:47 pm Thread Starter
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Re: GT O2 sensor

Quote:
Originally Posted by grifscoots
After installing the new O2 sensor and doing the TPS reset the bike was perfect. After the bike overcame the TPS reset it was good, but not there yet. I installed the Power Frk sometime before Christmas and the fueling has been spot on ever since. It works off the temp air sensor on the airbox. I haven't been jumping up and down in joy yet, as I haven't ridden the bike in hot temps. If this fix works in the heat, I'll be screaming it.
Hey Grif,
A while back I installed my new O2 sensor and things were grand. Then I did the throttle restrictor shim mod. After shimming the solenoid I did the tps procedure. Now I have that low rpm hesitation back. It actually started its symtoms just before the mod, But became worse afterwards. I am thinking coincidence. So, my O2 sensor fix only lasted about a thousand miles. How is that FRK holding up?

Brian Ley
WA State of mindless sheep
USA where everything is illegal
2007 K1200GT
2010 650GS
2000 k1200LT Sold but not forgotten
BMWOA 119892
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post #11 of 16 Old Mar 27th, 2009, 7:00 pm
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Re: GT O2 sensor

Quote:
Originally Posted by sanjaun2
Hey Grif,
A while back I installed my new O2 sensor and things were grand. Then I did the throttle restrictor shim mod. After shimming the solenoid I did the tps procedure. Now I have that low rpm hesitation back. It actually started its symtoms just before the mod, But became worse afterwards. I am thinking coincidence. So, my O2 sensor fix only lasted about a thousand miles. How is that FRK holding up?
It's been perfect, the fueling spot on and no hesitation what-so-ever. I haven't ridden in anything hotter than 85 degrees. When I ride in hot weather and the fueling stays, I'll be screaming it.

On the older LT's we unplugged the air box temp sensor and it did away with hesitation. The FRK plugs inline with the air box temp sensor and has been great. I did notice a very small, subtle vibration in the handlebars after installing the FRK. It was so subtle that I don't notice it anymore. I shimmed the stepper motor the same time I installed the FRK.

I noticed the same thing you did after installing the O2 and came to the conclusion that this bike likes a regular (thousand mile) TPS reset. I haven't reset the TPS since the FRK install. Man, I hope it sticks in hot weather! Even if it doesn't, I recommend this product for taking out the hesitation.



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post #12 of 16 Old Mar 27th, 2009, 7:40 pm Thread Starter
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Re: GT O2 sensor

Thanks Grif,
I think I'll be the next to try the FRK. I'll let ya know.

Brian Ley
WA State of mindless sheep
USA where everything is illegal
2007 K1200GT
2010 650GS
2000 k1200LT Sold but not forgotten
BMWOA 119892
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post #13 of 16 Old Mar 28th, 2009, 12:43 pm
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Re: GT O2 sensor

Grif, any noticeable change in mpg?

Ken
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'13 Dark Graphite Metallic K16GTLD, 24K miles
'09 Magnesium Beige Metallic K13GT, 63K miles
'03 Anthracite Metallic K12LTC, 66K miles
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#143, IBA# 366, MOA# 111996, SCMA# 24032


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post #14 of 16 Old Mar 28th, 2009, 12:50 pm
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Re: GT O2 sensor

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Originally Posted by meese
Grif, any noticeable change in mpg?
Yes, it's gone down. Of course, it's been windly like crazy here, gusts up to 25-30 mph and we all know how that affects the GT. Then, since I did the stepper motor shim and there is NO HESITATION, well, I've been a bad boy. Seems I can't stay out of the throttle.

We're doing a Big Bend trip April 17 and the guys going are pretty mellow. I'll let you know then.



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post #15 of 16 Old Mar 28th, 2009, 1:44 pm
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Re: GT O2 sensor

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Originally Posted by grifscoots
Yes, it's gone down. Of course, it's been windly like crazy here, gusts up to 25-30 mph and we all know how that affects the GT. Then, since I did the stepper motor shim and there is NO HESITATION, well, I've been a bad boy. Seems I can't stay out of the throttle.

We're doing a Big Bend trip April 17 and the guys going are pretty mellow. I'll let you know then.
Mellow?

MELLOW?!?!?!?!

You callin' Monte mellow????? Why, he wuz on his Piaggio the other day and, and, .... and.... passed a car!!!

Damn straight! Passed that bugger like it wuz sittin' still!!

And he wuz hollerin' WOOHOO all the way.

I think that car had 'bout 8 more minutes on the parking meter!!!
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post #16 of 16 Old Mar 28th, 2009, 2:22 pm
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Re: GT O2 sensor

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Mellow?

MELLOW?!?!?!?!

You callin' Monte mellow????? Why, he wuz on his Piaggio the other day and, and, .... and.... passed a car!!!

Damn straight! Passed that bugger like it wuz sittin' still!!

And he wuz hollerin' WOOHOO all the way.

I think that car had 'bout 8 more minutes on the parking meter!!!
Wait and see! Why the speed limit on the highway isn't even met and we stop every 200 miles. I have to get in my laid back, happy spot for that kind of riding.



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