Harley Davidson Forums - Ignition/Tuner/ECM/Fuel Injection

I know I�m not the only one

Medevack1 — Wed, 20 May 2026 13:06:59 GMT

I know I am not the only one who has broken a fuel rail while trying to work on the bike or taking the tank off, so now Bike is in pieces and waiting for Parts who else has this happened to ? 2023 Street Glide Special

Tank swap + fuel pump fitment question

geof — Tue, 19 May 2026 01:39:53 GMT

Hello,

Have a '19 XL1200NS w/ fuel pump 75305-07A and purchased, on eBay, a slightly larger 3.7 gallon tank that said it would fit a 1200 custom 07-up. I struggled for a good 25 minutes trying to get the fuel pump inserted but it seems the breather line inside the tank was blocking the pump from fully seating, and no amount of side angle penetration would clear it. The OEM tank's breather travels to the side of the opening instead of through it. Is it normal for this to cross the opening? The eBay tank also appears to have a larger lip instead of a flush edge. Going to return it but should I be looking for something specific on the next tank I order? Trying to understand what my error was in ordering so I don't repeat it.

Thanks for your help.

Attached Thumbnails

Power vision pv-3b question

dontdropit — Thu, 14 May 2026 01:42:21 GMT

I have a power vision pv-3b the touchscreen model. Is there a way I can see the current tune it has downloaded to the ECM? Just to verify

Powervision o2 kit or dyno

ultraglide12 — Wed, 13 May 2026 17:41:16 GMT

Hey i got Powervision on my 12 ultra classic 103 with stage 1 rinehart true duel and wondering if which way to go to add the o2 kit or get a dyno tuned if i can find a good tuner around my area. I want to richen it up to run alot cooler instead of lean and hot and burning inside of my leg am I asking for to much. What's a good dyno cost? That kit is just over 600 usd .
Thanx

Screamin� Eagle Pro street tuner laptop software.

204Denali — Tue, 12 May 2026 13:47:19 GMT

Does anybody have a stable version of the laptop software to utilize the Y cable? The downloadable software on Harley�s website keeps flagging as having a virus. Thanks.

SE Extreme Wedge Air Cleaner not Playing Nice

gabhart — Mon, 11 May 2026 13:15:52 GMT

2024 Street Glide, Rinehart Slip On's, SE High Flow Air Filter (pop in K&N filter for the stock airbox), SE Pro Street Tuner running the 117 Stage 1 tune (standard, not wide band). Bike has been running fine with this combination.

I have always hated the look of the stock airbox so I installed the SE Extreme Wedge and reinstalled the Stage 1 tune to 'start over'. When I started the bike after the retune, the bike ran very rough and started to backfire. It eventually smoothed out a bit but was still not right. I rode for a short time in hopes the system just needed to readjust to compensate for the better airflow but it still idled rough.

I installed the tune again thinking I may have fat fingered something or the tune was corrupt. It started without backfiring but the idle remained rough and there was a strong smell of gas telling me it was running rich. I confirmed the installation of the Extreme Wedge AC and everything looked good.

At a loss, I removed the Extreme Wedge and reinstalled the stock airbox with the K&N filter. Bike started fine and ran great.

This points to the Extreme Wedge causing an issue. There are no holes in the air cleaner elements. All seal surfaces appeared to be seated properly.

Any advice on where to go with this (be nice!) next would be very much appreciated!

Best place to buy Thunder Max?

glasspilot — Mon, 11 May 2026 10:41:42 GMT

Hi guys, My 2006 EG Ultra now has a new engine. An S&S T111! Also a Horsepower Inc throttle body. A friend bought a Thunder Max years ago and he swears it's the best tuner out there.

I know you can buy it directly from the company but do any of you guys prefer to buy from elsewhere for any reason?

Smart tune runs, how many?

roussfam — Fri, 08 May 2026 15:51:22 GMT

Deleted

Fuel leak at return fitting on tank MM EFI

SouthNoackBiker — Wed, 06 May 2026 20:14:30 GMT

Hello -

Have a 99 Road King FLHPI with the ever-luvly MM EFI setup, finally have the idle dialed-in and CAM preventative measures dealt-with (inner cam bearings and tensioner shoes). Now I have a fuel leak at the return line (rear) fitting on the tank. At first I pulled the C-clip and pulled the hose fitting off the stud and replaced the O-rings, no dice. Bought set of new fuel lines which came with the connectors (to the tank), installed, same problem unfortunately. I've read several threads indicating an issue with the fuel line and/or O-rings, however this fuel line is brand-new. I am suspecting a problem with the return-line check-valve possibly being stuck closed maybe? And so when I turn on the fuel pump (ignition switch), gas seeps from the O-ring area of the rear connector, so either too much pressure and/or something wrong with the check valve it would seem, or a crappy brand new fuel line. How does one replace (likely repair as nearly all MM EFI parts are unobtainium) these check valves? And where are the check valves? Are they in the tank? This is the fuel line kit I bought which screws right up into the tank:

Amazon

I'm thinking I'll need to pull the tank, take everything out (likely need to clean/replace the fuel filter anyhow) and see what's going on here?

And yes I get it, I'll need to eventually pay the piper and do the Mikuni 42 conversation although I would like to hold-off on that for now however I sure don't like gas seeping out of the fuel line onto the top of the rear cylinder head, definitely not good.

Tim

Stuck Key / Ignition

Zakkdestroys — Tue, 05 May 2026 22:50:04 GMT

2013 FLHX
Key has been sticking and hard to turn from lock to unlock since I got the bike a few weeks ago, I removed the ignition today to adjust the bars and when reinstalling everything the key won�t move back to unlock, it�s currently past the unlock position. I can reassemble the ignition and it turns to all positions but I have no power and the forks are locked. I tried lubing and tapping the ignition thinking the tumblers are just stuck. Am I missing something before I buy a new ignition?

Won�t turn at all whether it�s installed in the bike or not.

No power.

67 pan shovel timing problems..

norrism8 — Mon, 04 May 2026 00:50:04 GMT

I�m trying to get the timing right on my 67 gent shovel.. the distributor advance isn�t the same as what I�m seeing on how to videos, and i get two different slash marks in the inspection home, And the backing plate doesn�t turn far enough to open the points on the compression stroke while I can see either slash marks.. I think I�m just confused lol any help would be appreciated.. attached pictures of the distributor and timing marks in current position

2006 FXDBi no spark, no power to the coil.

revoluionski1 — Sun, 03 May 2026 13:17:53 GMT

Hey Guys,

My 06 street Bob died on me a few weeks back. I replaced the battery, it started up, ran for 20 miles and now won�t start.

Battery is good.
I checked the stator and all good.
haven�t charged the regulator as I couldn�t get it running.

pulled the plugs - no spark
Pulled the coil and tested with a multimeter - all good.
tested the power to the coil (green & yellow wire on connector I believe) and nothing.

No codes in diagnostic.

Is the ECM toast?

it�s got a power commander 3 in and when I plug the computer into it, it recognises the PC3

I�ve exhausted my ability and knowledge.

Any input would be greatly appreciated.

FP3 tuner

sonnys9986 — Sun, 03 May 2026 03:10:02 GMT

I haven't used my Vance & Hines tuner on my 2014 Ultra Limited FLHTK in a few years and I just never bothered to unplug it from my bike or use the app because the bike seems to run good as is. BUT I was never really sure if I programmed it correctly when I first bought it in 2016 & was continually flashing new info . What is the most common mistake that users make that I should avoid. I know this probably comes up a lot but I would have to search through a lot of posts to get an answer .

Throttle surge at low speed turns

BradyGriffin — Fri, 01 May 2026 17:53:00 GMT

Just did a 1,000 mile service on a 2026 Street Glide Limited yesterday. Told dealer that when turning, I experience a small "throttle surge" in low gears that's especially troubling in turns with sand or gravel. On my 7th Harley and never experienced it before. I assured him the throttle was in full off position during the surge. Dealer says it's "normal", the throttle is very sensitive. Is this BS?

Cable Throttle => Throttle by Wire

snake_eyes — Thu, 30 Apr 2026 14:36:21 GMT

I originally posted this in the Dyna section where I live but thought I'd get more eyes out here. I don't want a debate which is better or questions about why I'm "stupid" so you guys can save your hateraid for someone else.

I have RA everywhere, but I am very blessed to be almost completely controlled with meds; however, the times that my shoulder, elbow, wrist, hand, whatever could use a quick break are happening more frequently while I ride. While having a beer in the shop and admiring the bike last night I got to thinking about throttle by wire again. I pulled out the parts book and the shop manual while I sipped and listened to Ella Langley and here's what I found.

By way of simple comparison, a 2017 FXDLS has different numbers for the following parts:

ECM 41000057 | $700
Wiring harness 39201569A | $400
Throttle control 32700050 and tube 65100075 | $165
Left lower switch housing (cruise control) 71500282 and switch 71500290 | $100
Induction module 22200002 (I'll need an alternative since I'm running an HPI 58/62 setup)

From what I can tell, the ECM has 3 ports instead of 2, the third takes the feed from the throttle control and feeds it back to the induction module and done. Can it be that simple? I do not see any additional speed sensors beyond what my FXDB has, not counting the ABS sensors. Does anyone have any REAL knowledge on the topic?