2000 flhtpi backfire.

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Jul 23, 2024 | 11:22 AM

Gunny69

Thread Starter

Stage I

Joined: Jul 2024

Posts: 1

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From: MI

2000 flhtpi backfire.

Hello,
I am new to this forum and could use some help.
I just purchased a 2000 police bike with 62000 miles on it. It has a random backfire that is slowly getting worse. The only time the backfire is consistent is at 1300rpm. It has the magneti marelli injection system. Where should I start looking to fix this ?
Thanks in advance.

Jul 23, 2024 | 12:17 PM

svarnster

Road Warrior

Joined: Jul 2011

Posts: 1,936

Likes: 310

From: coastal sc

sounds lean. what mods have been done. exhaust, cams ....... does it have a tuner or has it been tuned. All of that and much more could be involved.

Jul 23, 2024 | 12:26 PM

Ultra103

Road Warrior

Joined: Apr 2008

Posts: 1,951

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From: Arkansas

Check your exhaust flange tightness at the heads. Check for a cracked exhaust pipe close to the rear head.

Jul 23, 2024 | 01:16 PM

springers4ever

Road Master

Joined: Jun 2011

Posts: 836

Likes: 230

From: Deep South

Link...

you need to watch and perform this and see if this helps...
this will work on the EVO and Twin Cam

Jul 23, 2024 | 01:37 PM

internet troll

Road Master

Joined: Nov 2018

Posts: 922

Likes: 898

From: Upstate NY

Quote:

Originally Posted by Ultra103

Check your exhaust flange tightness at the heads. Check for a cracked exhaust pipe close to the rear head.

THIS ^ . Exhaust leaks from broken or loose manifolds are very common and most often manifest themselves in lower rpm popping. Dont forget to check your Y pipe or any other kind of crossover.

Jul 24, 2024 | 12:38 PM

Dano523

HDF Community Team

Joined: Jan 2020

Posts: 1,434

Likes: 800

From: Colorado

Quote:

Originally Posted by springers4ever

you need to watch and perform this and see if this helps...
this will work on the EVO and Twin Cam
https://www.youtube.com/watch?v=bY6Pw8WpSfc

Nope on the postion sensor, since 2000 twin cam throttle body position sensor is not adjustable like the earlier MM slotted evo sensors.

My guess, would be either intake or exhaust leak (or motor just running too lean), and since was until later that they did way with the crank sensor on the twin cam motors, may be a problem with crank sensor starting to go out as well. I TB throttle posistion does have a flat spot, then way to pull it apart to clean and solve that problem.

As for other items that come to mind, when was the last time the fuel filter in the tank was replace, other parts checked for a leaks in tank as well, since these could be causing the motor to run lean as well.