Vacuum port

[Xtremeroller]

While cleaning my air filter the other day I noticed the cap missing from the vacuum port on the throttle bodies. I don't know how long it's been missing but I had no noticeable engine performance while it was off. I replaced the cap and now the bike dies when I pull up to stoplights. Do I need to disconnect the battery for a few hours so the ECU can reset? Any help would be great.

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[Xtremeroller]

No insight or opinions on this at all???? Am I just going to have to take it to the dealership and pay them their $90 an hour to look at it?

 

[Spazz]

If you know your dealership people well... ( and we all should)... just ask them what to do. Shouldn't cost you anything to ask.

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[danoday]

I think that may be a California cap for CA bikes, reading on some other sites, they say it must be capped off and recommend the use of a beefier HD brand for better/proper fitment or it may pop off again. others say they did reload or reset the ECU.

additionally, from what I have read, your ECM can compensate for that vacuum leak, but performance will be degraded such as MPG and stalling from a slow take off. Other issues to be concerned about, if you tuned your bike while vacuum leaking, simply capping may cause the bike to run really crappy also, and a tune will be needed.

 

[Xtremeroller]

I capped it and unhooked the battery for a few hours last night so we'll see how it goes.

 

[danoday]

I capped it and unhooked the battery for a few hours last night so we'll see how it goes.

I would be assuming you have a after market tuner based on your headers listed, you may just want to re-map or auto-tune because the vacuum leak will not produce a fault code but it will create a rich fueling condition that may cause other issues. that's just my opinion.

 

[Xtremeroller]

I have the orange screaming eagle tuner

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[slingshot383]

You can buy the cables and download the software to fix this tuning issue issue yourself, you don't have to have the dealer do it.

 

[Xtremeroller]

I rode a bit before the rain hit today with no issues. I'm going to keep an eye on it but I don't think it was tuned with the cap off.

 

[danoday]

I rode a bit before the rain hit today with no issues. I'm going to keep an eye on it but I don't think it was tuned with the cap off.

that's good news.

 

[Xtremeroller]

Well I thought I was in the clear but it started doing it again today. Spoke to the service guy at Harley and he said I would have to bring it in for a retune. What he quoted was their shop rate of $99 hour and it could take them anywhere from one to five hours to tune. For a possible cost of $500- $600 I think I will just go with something else from fuel moto. Really disappointed in Harley right now.

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[danoday]

Well I thought I was in the clear but it started doing it again today. Spoke to the service guy at Harley and he said I would have to bring it in for a retune. What he quoted was their shop rate of $99 hour and it could take them anywhere from one to five hours to tune. For a possible cost of $500- $600 I think I will just go with something else from fuel moto. Really disappointed in Harley right now.

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I am not familiar with the SE Tuner, see below, Slingshot says you can do fix this yourself with the proper cables and software. I am sure there are plenty of folks who can offer up some guidance or a tutorial to get through it.

 

[Xtremeroller]

Thanks for the input guys. I have been looking at the cables and trying to read up on how to do the data log and then apply it to a map.

 

[Sirrat007]

I thought a vacuum caused a lean condition?
Respectfully Mike M

I would be assuming you have a after market tuner based on your headers listed, you may just want to re-map or auto-tune because the vacuum leak will not produce a fault code but it will create a rich fueling condition that may cause other issues. that's just my opinion.

 

[BlkDragon]

I thought a vacuum caused a lean condition?
Respectfully Mike M

Vacuum leak caused a lean, ECU will detect lean and automatically readjust the bike to run rich. Back in the days before ECU, vacuum leak will cause the bike/car to run lean.

 

[Sirrat007]

Vacuum leak caused a lean, ECU will detect lean and automatically readjust the bike to run rich. Back in the days before ECU, vacuum leak will cause the bike/car to run lean.

TY for the ed. I've had flatheads and panheads, shovelheads and blockheads. My 2016 SG is the first electronic bike I have ever had...goon take some relearning I think ;0)

 

[hulkss]

You do not need to do much. Just download the proper tune file for your bike. Load it into the bike and make sure you do what the instructions say to erase the stored fuel trims. The old stored values from running with the leak is why your bike runs like crap. The bike will re-tune itself in an hour or so of riding.