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post #1 of 8 Old Jun 11th, 2009, 2:57 pm Thread Starter
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Hesitation on Hot Days

I read the tech article on the fuel injection map that causes hesitation in hot weather to prevent pre-ignition. I immediately pulled off the topcase and disengaged the yellow connector on my 99 LT only to find that the bike would not start. Is there another way to do this without cutting a temperature sensor?
thanks
John
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post #2 of 8 Old Jun 11th, 2009, 4:16 pm
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Re: Hesitation on Hot Days

I did the cutting the temp sensor back in 01 and I cannot say it often enough: afterwards I asked myself why I waited so long. You will have a new bike and no negative impact on the bike whatsoever. I ran mine until it was shot down with 60k miles on the odo like that.

Do it man, cut the wire. Its not as if you'd loose any warranty.
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post #3 of 8 Old Jun 11th, 2009, 4:28 pm
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Re: Hesitation on Hot Days

my 03 has the brown wire mod done to it - I believe it runs a different fuel map, not sure. Anyhow it got rid of the bog on my 03, maybe it would work for your 99. I sure someone here in the know will pipe up.

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post #4 of 8 Old Jun 11th, 2009, 4:48 pm
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Re: Hesitation on Hot Days

Quote:
Originally Posted by rjb1696
I read the tech article on the fuel injection map that causes hesitation in hot weather to prevent pre-ignition. I immediately pulled off the topcase and disengaged the yellow connector on my 99 LT only to find that the bike would not start. Is there another way to do this without cutting a temperature sensor?
thanks
John
No need to cut. I believe on the 99 model (this is true for my 1999 built 2000 model) you just unplug the air temp sensor connector behind the radiator cap where it is mounted on the air box.
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post #5 of 8 Old Jun 11th, 2009, 5:16 pm
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Re: Hesitation on Hot Days

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Originally Posted by CharlieVT
No need to cut. I believe on the 99 model (this is true for my 1999 built 2000 model) you just unplug the air temp sensor connector behind the radiator cap where it is mounted on the air box.
Yup, Curtis is right. Dude at Lone Star reached up under the nose cone and undid ole Toad's airbox temp sensor, back in '00, and it's been running like I stole it ever since!! Not one instance of hesitation, ever! When I later had the chance, I band-aided the connections to keep out debreeze.

BTW - concensus is that after you disconnect the sensor, you should run hi-test gasmoline from then on. The Motronic expects you to!!
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post #6 of 8 Old Jun 11th, 2009, 8:30 pm
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Re: Hesitation on Hot Days

Did the RhineWest chip thing with the OEM exhaust and some of the hesitation went away. Then installed the Remus and aftermarket exhaust RhineWest chip; not nearly as noticeable at 95 F.

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post #7 of 8 Old Jun 12th, 2009, 8:52 am
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Re: Hesitation on Hot Days

If your '99 is an early one the brown wire fix may or may not work. My 1st Lt was a very early '99 and it had the problem big time. Ultimately the engine control computer was replaced and that fixed the problem. I believe that replacement was done as a recall on the early models. You might inquire at your dealership.

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post #8 of 8 Old Jun 12th, 2009, 9:11 am
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Exclamation Re: Hesitation on Hot Days

Quote:
Originally Posted by rjb1696
I read the tech article on the fuel injection map that causes hesitation in hot weather to prevent pre-ignition. I immediately pulled off the topcase and disengaged the yellow connector on my 99 LT only to find that the bike would not start. Is there another way to do this without cutting a temperature sensor?
thanks
John
I did just that when I had my early 99 LT and it worked like a charm. Not sure why your bike did not start after you removed the cat plug...
As suggested by others here just unplug the airbox temperature sensor but be sure to put back the cat plug as I believe you should not do both things together.

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