Erratic idle in traffic
Thread Starter
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6th Gear
Joined: Jun 2021
Posts: 14
Likes: 1
From: Cambridgeshire
Erratic idle in traffic
Hi folks,
Ive recently acquired a 2018 M8 Breakout. Its done less than 1000 miles and has a stage 1 with big radius pipes.
for some reason the idle rises and falls in traffic or at junctions etc. It settles eventually but its a real pain when it fluctuates from normal idle speed to 1,300+ rpm with the throttle closed.
my local dealer keeps trying to hint that its normal. Surely it cant be??
then they suggested an FP3 tuner might fix it. They supposedly fitted one but before i was a mile away from collecting the bike from them after theyd fixed it, it was doing exactly the same thing.
Anybody had the same issue/had it fixed?
Ive recently acquired a 2018 M8 Breakout. Its done less than 1000 miles and has a stage 1 with big radius pipes.
for some reason the idle rises and falls in traffic or at junctions etc. It settles eventually but its a real pain when it fluctuates from normal idle speed to 1,300+ rpm with the throttle closed.
my local dealer keeps trying to hint that its normal. Surely it cant be??
then they suggested an FP3 tuner might fix it. They supposedly fitted one but before i was a mile away from collecting the bike from them after theyd fixed it, it was doing exactly the same thing.
Anybody had the same issue/had it fixed?
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,652
Likes: 11,421
From: State of Confusion
Hi folks,
Ive recently acquired a 2018 M8 Breakout. Its done less than 1000 miles and has a stage 1 with big radius pipes.
for some reason the idle rises and falls in traffic or at junctions etc. It settles eventually but its a real pain when it fluctuates from normal idle speed to 1,300+ rpm with the throttle closed.
my local dealer keeps trying to hint that its normal. Surely it cant be??
then they suggested an FP3 tuner might fix it. They supposedly fitted one but before i was a mile away from collecting the bike from them after theyd fixed it, it was doing exactly the same thing.
Anybody had the same issue/had it fixed?
Ive recently acquired a 2018 M8 Breakout. Its done less than 1000 miles and has a stage 1 with big radius pipes.
for some reason the idle rises and falls in traffic or at junctions etc. It settles eventually but its a real pain when it fluctuates from normal idle speed to 1,300+ rpm with the throttle closed.
my local dealer keeps trying to hint that its normal. Surely it cant be??
then they suggested an FP3 tuner might fix it. They supposedly fitted one but before i was a mile away from collecting the bike from them after theyd fixed it, it was doing exactly the same thing.
Anybody had the same issue/had it fixed?
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,652
Likes: 11,421
From: State of Confusion
I thought eitms was only on touring models but could be wrong, haven't owned a Softail M8.. besides, eitms is set to idle at 1050, ~100 more rpms than normal idle..his is fluctuating erratically to 1300 so there's that
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,233
Likes: 4,943
From: England
If the bike has a stage 1 did you find out how the mixture was set for higher air flow? ECM remap, dyno, etc.
See if there is any codes stored.
If it is not a leak on the intake side see if there is a problem with the idle air controller or whatever it is called on your bike.
See if there is any codes stored.
If it is not a leak on the intake side see if there is a problem with the idle air controller or whatever it is called on your bike.
Operation When engine temperature reaches a pre*determined point, the EITMS will turn off the rear cylinder fuel injector. Idle speed will be maintained; however, the rear cylinder will become an “air pump” which will work to cool the engine.
Last edited by Andy from Sandy; Jun 14, 2021 at 11:39 AM.
Thread Starter
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6th Gear
Joined: Jun 2021
Posts: 14
Likes: 1
From: Cambridgeshire
thanks👍🏻
Seasoned HDF Member
Joined: Jul 2013
Posts: 11,185
Likes: 7,961
From: In my head
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Seasoned HDF Member
Joined: Jul 2013
Posts: 11,185
Likes: 7,961
From: In my head
If the bike has a stage 1 did you find out how the mixture was set for higher air flow? ECM remap, dyno, etc.
See if there is any codes stored.
If it is not a leak on the intake side see if there is a problem with the idle air controller or whatever it is called on your bike.
See if there is any codes stored.
If it is not a leak on the intake side see if there is a problem with the idle air controller or whatever it is called on your bike.
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Seasoned HDF Member
Joined: Jan 2008
Posts: 13,652
Likes: 11,421
From: State of Confusion
my eitms has always behaved stable, 1050 rpms, not erratic up and down to 1300+ rpms and I've had it on bikes since its inception