09 dyna restart
Elite HDF Member
Joined: Apr 2007
Posts: 4,919
Likes: 23
From: Seattle, WA
Shouldn't be vapor lock if the purpose of the fuel pump priming is to pressurize the fuel system, right ...?
Could it be something with the IAC sticking or a ECM programming issue with the IAC ...?
That seems more likely to me ... could be something as simple as a sticking throttle plate or something in the throttle body ... would check out that possibility ... there's some really good carb cleaner-type fluid you can spray into the intake and see if it will clear out any crud that might be causing it ....
There was a thread that referenced some good spray not too long ago, maybe do a search ... or probably whoever recommended it before will jump on and post the name of a good spray to use to clean it out ....
R/
'Chop
Could it be something with the IAC sticking or a ECM programming issue with the IAC ...?
That seems more likely to me ... could be something as simple as a sticking throttle plate or something in the throttle body ... would check out that possibility ... there's some really good carb cleaner-type fluid you can spray into the intake and see if it will clear out any crud that might be causing it ....
There was a thread that referenced some good spray not too long ago, maybe do a search ... or probably whoever recommended it before will jump on and post the name of a good spray to use to clean it out ....
R/
'Chop
Tourer
Joined: Jun 2009
Posts: 433
Likes: 3
From: Northern Illinois
Same here with the pipes, powercommander and a/c. I also flip the switch and hit the starter right away to help it get going.
Tourer
Joined: Dec 2007
Posts: 319
Likes: 0
From: chester sc
mine does it also <08> seems like a timing prob to me,spits out intake and kicks back,after it does it i turn run switch off then on and she fires right up.im running fuel pak and se intake.occasionally after i run it hard and come to a stop it idles low and rough also,wonder if they are related problems or just the nature of the beast?
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Novice
Joined: Jun 2010
Posts: 19
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Yea sometimes on a hot day after sitting at a red light or something when I go to take off at first she does not have the power off the line until I get the rpms up then she will run fine. I dont know if that could be related. As far as the intake being gummed up I bought the bike with a 0.0 odometer reading and the first time it did it I only had 30 miles on it. It should not of got gummed up that fast.
Advanced
Joined: Oct 2008
Posts: 56
Likes: 0
From: Yucaipa, CA
yea, my 07 fxdb does it when i ride for a while then fill up. ive got a thunderheader, SE A/C and PC 5. Ive replaced the battery, plugs and wires, and added fuel treatment didnt help, but hitting the start button before it primes when its hot does-----go figure.
Tourer
Joined: Mar 2009
Posts: 259
Likes: 1
From: I'm on the Central West Coast
I was experiencing a similar problem with my '09FXD.
When I would stop for short periods it would crank extra long to start instead of starting right up as it would when cold.
Because I was running Xieds I addressed the question to spmullen@http://www.tuneyourharley.com/forum/...6abc2a343621a5
By the way I have since installed a new Thundermax Auto tune and the bike starts right up every time as soon as I hit the button. Better than new actually, hot or cold starts.
This is part of his reply.
To answer your question, I went out and ran my test bike (08 FXD) until the engine was hot. Shut the engine off, waited 30 seconds and restarted. It was a little slow, per your experience. I need to explore this a little more. I have never tested this specific set of conditions. This has nothing to do with a lean engine condition like the mechanic suggested. But this probably has something to do with the warm/hot start cycle of the ECM and interaction with the IED. Until I get a chance to log how the ECM is reacting to these specific conditions, I don't want to speculate on what the ECM is doing. But I know the ECM is probably getting fooled at startup when it reads the O2 sensors, and is not getting the proper startup enrichment value. I just need to find the mechanism that is occurring. Keep watching/writing for any updates I come up with.
When I would stop for short periods it would crank extra long to start instead of starting right up as it would when cold.
Because I was running Xieds I addressed the question to spmullen@http://www.tuneyourharley.com/forum/...6abc2a343621a5
By the way I have since installed a new Thundermax Auto tune and the bike starts right up every time as soon as I hit the button. Better than new actually, hot or cold starts.
This is part of his reply.
To answer your question, I went out and ran my test bike (08 FXD) until the engine was hot. Shut the engine off, waited 30 seconds and restarted. It was a little slow, per your experience. I need to explore this a little more. I have never tested this specific set of conditions. This has nothing to do with a lean engine condition like the mechanic suggested. But this probably has something to do with the warm/hot start cycle of the ECM and interaction with the IED. Until I get a chance to log how the ECM is reacting to these specific conditions, I don't want to speculate on what the ECM is doing. But I know the ECM is probably getting fooled at startup when it reads the O2 sensors, and is not getting the proper startup enrichment value. I just need to find the mechanism that is occurring. Keep watching/writing for any updates I come up with.
Elite HDF Member
Joined: Apr 2007
Posts: 4,919
Likes: 23
From: Seattle, WA
Tom interesting stuff ... I think it probably is the ECM ....
I have an '05 and experienced this on a relatively frequent basis ... not problematic, just get a cough and not hit right off, like when it was cold ...
But, that was on an open loop system (no O2 sensors) ... so, may have something to do with manifold absolute pressure, engine temp, crank position sensor or some other inputs to the ECM in addition to, or instead of the O2 sensors ....
As soon as I installed my ThunderMax with Auto Tune (closed loop ... added O2 sensors), the problem disappeared ... never had to hit the start button more than once (hot or cold) and hits of right away, every time ....
R/
'Chop
I have an '05 and experienced this on a relatively frequent basis ... not problematic, just get a cough and not hit right off, like when it was cold ...
But, that was on an open loop system (no O2 sensors) ... so, may have something to do with manifold absolute pressure, engine temp, crank position sensor or some other inputs to the ECM in addition to, or instead of the O2 sensors ....
As soon as I installed my ThunderMax with Auto Tune (closed loop ... added O2 sensors), the problem disappeared ... never had to hit the start button more than once (hot or cold) and hits of right away, every time ....
R/
'Chop
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Novice
Joined: Jun 2010
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I dont know if this matters but I am not saying that it is just taking a little longer to start I mean that when it is doing it the first time I hit the start button it will not start I have to let go of the button then push it again to start it
Tourer
Joined: Mar 2009
Posts: 259
Likes: 1
From: I'm on the Central West Coast
Yeah, I got that. That's why I said my problem was similar instead of saying it was the same.
But chances are it's a related cause. Which is why I posted what I did.
It's probably a glitch in the ECM or one of the sensors.
I would think it's a false reading by the crank position sensor so that it doesn't fire in the right spot.
But chances are it's a related cause. Which is why I posted what I did.
It's probably a glitch in the ECM or one of the sensors.
I would think it's a false reading by the crank position sensor so that it doesn't fire in the right spot.