engine hesitation

ridingmtnroads · Aug 5th, 2008, 10:59 AM

My 08 Night Rod Special has about 1200 miles on it. It goes like hell, but below about 3400 RPM especailly in lower gears, it hesitates and feels a little "jerky". What comes to mind is bad gas (but I've been through many tanks) or something with the fuel injection - but I'm no mechanic.
I mentioned it to the dealer when I brought it in for it's 1000 mile service and was told that this engine is only happy over 4000RPM and that it's a Harley, it's going to be a bit rough. I don't buy it...anyone else have expreience with this issue?

K.

glider · Aug 5th, 2008, 12:55 PM

Tell them to go back to school, it's running lean and they come from the factory like that thanks to EPA.

I would get a TFI and install it (easy install) and the bike will run MUCH better. Used them many times and unless you prefer to buy the SERT for $400+ and some dyno time and total it to about $700-900 this is the best choice IMO.

http://www.techlusion.com/

TQuentin1 · Aug 5th, 2008, 02:41 PM

Quote:

Originally Posted by glider

Tell them to go back to school, it's running lean and they come from the factory like that thanks to EPA.

I would get a TFI and install it (easy install) and the bike will run MUCH better. Used them many times and unless you prefer to buy the SERT for $400+ and some dyno time and total it to about $700-900 this is the best choice IMO.

http://www.techlusion.com/

Glider,

How does the TFI work - meaning does it replace the OEM ECU? If so, does the TFI throw any error codes if something is wrong?

TQ

Hobbit · Aug 5th, 2008, 03:25 PM

TFI is a piggy back unit and alters the signal from the ECM were as the SERT actually reprograms it and leaves a foot print on the ECM, TFI is removable and leaves no trace on the ECM

glider · Aug 5th, 2008, 05:38 PM

Quote:

Originally Posted by TQuentin1

Glider,

How does the TFI work - meaning does it replace the OEM ECU? If so, does the TFI throw any error codes if something is wrong?

TQ

Hobbit has it nailed, basically all the TFI dies is adjust the pulse width of the injector pulses (richer) with the 4 pots in the unit., no timing or cylinder trim or any of those features like the PC III or SERT. There's 2 different units depending if you want to keep the 02 sensors in the loop or not.

Here's some Q&A on the TFI (fuel nanny as they call it)

Fuel Nanny FAQ

hkhajah · Aug 16th, 2008, 06:10 AM

I would sugest Power Commander (PC III) , it will cancel the O2 censors and ride wonderful... just remember to change the baffles.

~~Fisher~~ · Aug 16th, 2008, 06:25 PM

My recommendation for VRod EFI tuning.Will cover any future mods to the bike should you wanna change it.

Aug 5th, 2008, 10:59 AM	#1
ridingmtnroads New Family Ride: 2008 Night Rod Special VRSCDX Join Date: Aug 5th, 2008 Posts: 4 My Mood:	engine hesitation My 08 Night Rod Special has about 1200 miles on it. It goes like hell, but below about 3400 RPM especailly in lower gears, it hesitates and feels a little "jerky". What comes to mind is bad gas (but I've been through many tanks) or something with the fuel injection - but I'm no mechanic. I mentioned it to the dealer when I brought it in for it's 1000 mile service and was told that this engine is only happy over 4000RPM and that it's a Harley, it's going to be a bit rough. I don't buy it...anyone else have expreience with this issue? K.

Aug 5th, 2008, 12:55 PM	#2
glider Community Liaison Ride: 07 Road King Classic Join Date: Jun 21st, 2007 Posts: 21,062 My Mood:	Re: engine hesitation Tell them to go back to school, it's running lean and they come from the factory like that thanks to EPA. I would get a TFI and install it (easy install) and the bike will run MUCH better. Used them many times and unless you prefer to buy the SERT for $400+ and some dyno time and total it to about $700-900 this is the best choice IMO. http://www.techlusion.com/ __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

Aug 5th, 2008, 03:25 PM	#4
Hobbit Moderators Ride: 09 CVO Ultra Classic Join Date: May 18th, 2007 Location: The Shires UK Posts: 8,736 My Mood:	Re: engine hesitation TFI is a piggy back unit and alters the signal from the ECM were as the SERT actually reprograms it and leaves a foot print on the ECM, TFI is removable and leaves no trace on the ECM __________________ Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. >>Self Help Information and Tips<< click me!

Aug 16th, 2008, 06:10 AM	#6
hkhajah Start The Engine Ride: 2008 Night Rod Special Join Date: Jan 13th, 2008 Posts: 37 My Mood:	Re: engine hesitation I would sugest Power Commander (PC III) , it will cancel the O2 censors and ride wonderful... just remember to change the baffles.

Aug 16th, 2008, 06:25 PM	#7
~~Fisher~~ Account Removed Ride: 1981 FLH Shovel Join Date: Apr 21st, 2008 Location: Maryland Posts: 362 My Mood:	Re: engine hesitation My recommendation for VRod EFI tuning.Will cover any future mods to the bike should you wanna change it.

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