Throttle response from idle
Thread Starter
|
Intermediate
Joined: Aug 2018
Posts: 46
Likes: 6
From: United States
Throttle response from idle
Hi all,
I have a 2007 FXD Super Glide EFI. I've been noticing over the past few weeks that I have been having problems whenever I go to roll off in 1st gear. I open throttle to start going and it sounds like it almost is going to stall out unless I give it more throttle. The throttle doesn't seem to respond well to quick snaps either, and it almost dies when doing so unless I let off of it, then it idles just fine with no problem. Once I get up to speed, (and I mean I can be on the highway) then it runs like a dream. It's only when I'm at a complete stop, at low speed in 1st or 2nd, cold or warm engine. I had it in for service for its 25k job during the winter; had fuel filter replaced, gaskets and seals around tank replaced too. It started happening shortly before I started to throw parts at whatever could have been at fault. I've cleaned the IAC sensor with throttle body cleaner, no change. Bike has little over 30k miles on it now. Trying to think of anything else that I've noticed....
What I've done so far to the bike:
I'm going to replace throttle position sensor today, and I have a new IAC motor on hand if the TPS doesn't get rid of this problem. If I were to replace the TPS, would I need to calibrate it in any way or is that just plug and play? It's just getting frustrating because the bike runs just fine otherwise. Any ideas?
I have a 2007 FXD Super Glide EFI. I've been noticing over the past few weeks that I have been having problems whenever I go to roll off in 1st gear. I open throttle to start going and it sounds like it almost is going to stall out unless I give it more throttle. The throttle doesn't seem to respond well to quick snaps either, and it almost dies when doing so unless I let off of it, then it idles just fine with no problem. Once I get up to speed, (and I mean I can be on the highway) then it runs like a dream. It's only when I'm at a complete stop, at low speed in 1st or 2nd, cold or warm engine. I had it in for service for its 25k job during the winter; had fuel filter replaced, gaskets and seals around tank replaced too. It started happening shortly before I started to throw parts at whatever could have been at fault. I've cleaned the IAC sensor with throttle body cleaner, no change. Bike has little over 30k miles on it now. Trying to think of anything else that I've noticed....
What I've done so far to the bike:
- Replaced plugs and put SE wires on
- Replaced coil
- Stage 1 Arlen Ness Big Sucker
- V&H Fuelpak FP3
- Replaced crank sensor
- Fresh battery as of January 2019
- Tranny fluid December 2018
- Primary oil December 2018
I'm going to replace throttle position sensor today, and I have a new IAC motor on hand if the TPS doesn't get rid of this problem. If I were to replace the TPS, would I need to calibrate it in any way or is that just plug and play? It's just getting frustrating because the bike runs just fine otherwise. Any ideas?
Last edited by believeinb; Jun 17, 2019 at 12:51 PM.
Tourer
Joined: Apr 2018
Posts: 295
Likes: 111
From: Medina, Ohio
Hi all,
I have a 2007 FXD Super Glide EFI. I've been noticing over the past few weeks that I have been having problems whenever I go to roll off in 1st gear. I open throttle to start going and it sounds like it almost is going to stall out unless I give it more throttle. The throttle doesn't seem to respond well to quick snaps either, and it almost dies when doing so unless I let off of it, then it idles just fine with no problem. Once I get up to speed, (and I mean I can be on the highway) then it runs like a dream. It's only when I'm at a complete stop, at low speed in 1st or 2nd, cold or warm engine. I had it in for service for its 25k job during the winter; had fuel filter replaced, gaskets and seals around tank replaced too. It started happening shortly before I started to throw parts at whatever could have been at fault. I've cleaned the IAC sensor with throttle body cleaner, no change. Bike has little over 30k miles on it now. Trying to think of anything else that I've noticed....
What I've done so far to the bike:
I'm going to replace throttle position sensor today, and I have a new IAC motor on hand if the TPS doesn't get rid of this problem. If I were to replace the TPS, would I need to calibrate it in any way or is that just plug and play? It's just getting frustrating because the bike runs just fine otherwise. Any ideas?
I have a 2007 FXD Super Glide EFI. I've been noticing over the past few weeks that I have been having problems whenever I go to roll off in 1st gear. I open throttle to start going and it sounds like it almost is going to stall out unless I give it more throttle. The throttle doesn't seem to respond well to quick snaps either, and it almost dies when doing so unless I let off of it, then it idles just fine with no problem. Once I get up to speed, (and I mean I can be on the highway) then it runs like a dream. It's only when I'm at a complete stop, at low speed in 1st or 2nd, cold or warm engine. I had it in for service for its 25k job during the winter; had fuel filter replaced, gaskets and seals around tank replaced too. It started happening shortly before I started to throw parts at whatever could have been at fault. I've cleaned the IAC sensor with throttle body cleaner, no change. Bike has little over 30k miles on it now. Trying to think of anything else that I've noticed....
What I've done so far to the bike:
- Replaced plugs and put SE wires on
- Replaced coil
- Stage 1 Arlen Ness Big Sucker
- V&H Fuelpak FP3
- Replaced crank sensor
- Fresh battery as of January 2019
- Tranny fluid December 2018
- Primary oil December 2018
I'm going to replace throttle position sensor today, and I have a new IAC motor on hand if the TPS doesn't get rid of this problem. If I were to replace the TPS, would I need to calibrate it in any way or is that just plug and play? It's just getting frustrating because the bike runs just fine otherwise. Any ideas?
Is it safe to assume you are cable operated and not drive-by-wire? I found that I had a lot of "slop" in my throttle at the beginning of this riding season. Turned out, the cable nut was completely loose and had backed off to where I could twist my throttle about a half inch before feeling any resistance. I tightened everything back up and now I have no play whatsoever and instant throttle response!
Thread Starter
|
Intermediate
Joined: Aug 2018
Posts: 46
Likes: 6
From: United States
It's cable operated, I'll check it to be sure. But it seems like if I open the throttle even with slack taken up, it sounds like its going to die unless I give it more throttle.
To add to work I've done to it, I had the starter clutch replaced because of some awful warm and hot starts, almost like metal on metal. Haven't had that happen since then, which was March of this year.
To add to work I've done to it, I had the starter clutch replaced because of some awful warm and hot starts, almost like metal on metal. Haven't had that happen since then, which was March of this year.
Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 870
From: Iowa
Trending Topics
Thread Starter
|
Intermediate
Joined: Aug 2018
Posts: 46
Likes: 6
From: United States
Fuel filter was replaced, had 25k service done on it back in January. This only happens low RPM, neutral, or rolling slow.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Outstanding HDF Member
Joined: Nov 2009
Posts: 2,666
Likes: 133
From: TEXAS
sounds to me like fuel filter or fuel pump issue
there are some problems that can happen when replacing the fuel filter, the lines can become very delicate or brittle if they dry out. they can get tiny pins holes and in a pressurized system can cause symptoms similar to clogged fuel filter
maybe clogged injectors
there are some problems that can happen when replacing the fuel filter, the lines can become very delicate or brittle if they dry out. they can get tiny pins holes and in a pressurized system can cause symptoms similar to clogged fuel filter
maybe clogged injectors
Tourer
Joined: May 2012
Posts: 335
Likes: 89
From: Reno, NV
In tank fuel line. Earlier Dynas are known for this. The plastic hose rubs against the inside of the tank and wears a small hole in it thus losing some fuel pressure. You will need to pull the pump assembly out and inspect the line. Look for flat spot(s) on the ribbed hose.
You can cut that line out and replace it with a submersible rubber hose. There's older threads here that you can search for that details the fix for this. Not a big deal. I had to do this on my '09 SB. I believe I used a 3/8" line not a 5/16".
You can cut that line out and replace it with a submersible rubber hose. There's older threads here that you can search for that details the fix for this. Not a big deal. I had to do this on my '09 SB. I believe I used a 3/8" line not a 5/16".