Engine Mechanical Topics Discussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.

Surging idle on startup

Thread Tools
 
Search this Thread
 
Old Sep 6, 2019 | 05:52 PM
  #1  
Woodcm96's Avatar
Woodcm96
Thread Starter
|
Stage II
Joined: Sep 2019
Posts: 2
Likes: 0
From: IL
Default Surging idle on startup

I have a 2008 FLHX that when cold started it idles from 875-1300, have change engine temp and map sensor out, all stock except foe stage 1 and fp3 tuner, idle straightens out when it reaches operating temp.
 
Reply
Old Sep 7, 2019 | 06:46 AM
  #2  
nutsandbolts5212's Avatar
nutsandbolts5212
Road Warrior
Veteran: Navy
15 Year Member
Liked
Joined: Sep 2009
Posts: 1,426
Likes: 821
From: Shitcago, Illinois
Default

Originally Posted by Woodcm96
I have a 2008 FLHX that when cold started it idles from 875-1300, have change engine temp and map sensor out, all stock except foe stage 1 and fp3 tuner, idle straightens out when it reaches operating temp.
Did you check for codes first?

Ride Safe!
 
Reply
Old Sep 7, 2019 | 06:48 AM
  #3  
Kawickrice's Avatar
Kawickrice
Grand HDF Member
10 Year Member
Liked
Loved
Community Favorite
Joined: Jul 2013
Posts: 4,752
Likes: 3,271
From: West Central Florida
Default

Sounds like the idle map is off. Remap it that should calm down the idle.
 

Last edited by Kawickrice; Sep 7, 2019 at 06:49 AM.
Reply
Old Sep 7, 2019 | 07:44 AM
  #4  
Woodcm96's Avatar
Woodcm96
Thread Starter
|
Stage II
Joined: Sep 2019
Posts: 2
Likes: 0
From: IL
Default

It threw a code saying ecm not getting enough voltage check for air leaks and throttle plate sticking no leaks and throttle plate not sticking. And ive remapped it many times its still the same.
 

Last edited by Woodcm96; Sep 7, 2019 at 10:50 AM. Reason: Spelling
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
fourburgs
Milwaukee Eight (M8)
10
Jun 29, 2017 05:04 PM
peci02@bellsouth.net
Sportster Models
0
Apr 19, 2017 05:28 PM
NWGlide
2014-2024 Touring Models
3
Apr 9, 2015 09:25 AM
VBdiver
Sportster Models
10
Oct 12, 2012 12:20 PM
rbabos
Ignition/Tuner/ECM/Fuel Injection
6
Sep 7, 2008 11:05 AM




All times are GMT -5. The time now is 11:09 PM.

story-0
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-1
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-2
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-3
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-4
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-5
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-6
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-7
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-8
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE
story-9
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

Slideshow: Graeme Billington's left-hand-drive Shovelhead is as much about problem-solving as it is about classic Harley form.

By Verdad Gallardo | 2025-12-30 11:27:08


VIEW MORE