High Idle after DP ECU (S2R1000)

[sheepgotoheaven]

Just seeing if anyone else has had this issue as well and could provide some guidance.

06' S2r1000
Arrow full system, No baffles.
Open airbox modded, K&N filter.
Reflashed stock ECU to DP ECU from Houston Superbikes.
No O2 sensor, no immobilizer, slightly increased redline.

Installed and it ran fine for a few minutes and then would Idle at 2.5-3k RPM. I figured I just needed to get it to the dealer for the TPS reset, CO trim set, and throttle body sync that I was gonna do after the new ECU install anyway.

The dealer performs all work and even cleans the gunk out of the throttle body butterflies and still the bike will idle at 3k rpm.

This happens when the bike is hot or cold.

The dealer does not believe the stepper motor is failed. I would agree as I have never had issues with idling with the stock ECU.

They are unable to diagnose the reason for the high idle an attribute it to something in the ECU as the ECU controls the stepper for idle.

Contacted houston superbikes and they say its definitely not the ECU but will look at it anyway.
I will most likely ship them back the ECU to check the flash.

Any advice would be appreciated. I am also in no way dissatisfied with Houston Superbikes as they have been prompt and helpful with this issue so far. The fueling and feel of the bike is much better than stock. Its just the idling problem thats now an issue as it will idle at 3k even when in gear and with no throttle applied. Its causing me to accelerate when i want to coast to a stop.

If it is indeed the stepper, im considering just pulling the stepper motor out and going the fast idle button mod route.
I live in San Diego and Im pretty sure I wont be doing any touring in cold weather on this thing.

Thanks in advance.

[Speeddog]

Pull the hoses from the stepper motor off of the fittings on throttle bodies, and cap the fittings, and try that to see if it'll idle normally.

[DarkMonster620]

Pull the hoses from the stepper motor off of the fittings on throttle bodies, and cap the fittings, and try that to see if it'll idle normally.

what  ^ said . . .

fwiw, at times the stepper WONT give a fault code . . . Check stepper motor settings . . .

[sheepgotoheaven]

Thanks for the advice. Gonna give this a go. Any tips on what to use to block off the inlets to the throttle bodies that were coming from the stepper?

If the stepper turns out to be bad I dont know where to find a new one for a decent price. Google and Ebay are saying $200 - $989. I may just for go the whole stepper motor and go the fast idle route.

Thanks again and ill update when I get to my garage.

[NAKID]

Thanks for the advice. Gonna give this a go. Any tips on what to use to block off the inlets to the throttle bodies that were coming from the stepper?

If the stepper turns out to be bad I dont know where to find a new one for a decent price. Google and Ebay are saying $200 - $989. I may just for go the whole stepper motor and go the fast idle route.

Thanks again and ill update when I get to my garage.

You can get vacuum caps at most auto parts stores.

[DarkMonster620]

Thanks for the advice. Gonna give this a go. Any tips on what to use to block off the inlets to the throttle bodies that were coming from the stepper?

If the stepper turns out to be bad I dont know where to find a new one for a decent price. Google and Ebay are saying $200 - $989. I may just for go the whole stepper motor and go the fast idle route.

Thanks again and ill update when I get to my garage.

My advice, get it new . . .

fhe with having customers bring their "used but working perfectly" parts . . .

[sheepgotoheaven]

Started the bike up today. It idled normally while cold. Though it did stall while idling once it held the rpms at around ~1400. I took it for a ride around the block and it would take a while to go back down to 1500 when I let off the throttle. Then when I got back around the block and back to my house it would start idling high at 3000 again.

Checked for vacuum leaks and could not find any.

Pulled it in and pulled off the hoses to the throttle bodies coming from the stepper and capped them off with the vac caps while the bike stayed hot. ~180

Started up the bike and it didn't idle high at all but would die if I did not give it any throttle. I'm assuming because the air bleeds were set for the stepper motor to hold the idle. Kept the bike running a while applying throttle to keep the bike alive for a few min just to make sure.

Then I put the stepper hoses back on and started the bike to the same high idle as before.


At this point I'm thinking it's 2 things:
The DP ECU flash is controlling the stepper incorrectly.

Or the the stepper is getting stuck for some reason when the bike is warmed up.

Any one know the criteria for the ecu to open the stepper up to let the bike idle that high? Broken temp sensor? The temp reads correctly on the clocks.

Things I can try to solve the issue:
send back my ecu and ask for a reflash. $Free+shipping

Buy some used throttle bodies and take the stepper off of those and see if a swap will fix it. $50ish on eBay?

Rip out the stepper, do the fast idle button mod, and take back to the dealer to have them set the idle with air bleeds + tps+ throttle sync again. $40 + $110 an hour for labor

Eh I don't know which way to go. Probably send the ecu first and see?

[Speeddog]

Temp sensor for the clocks is the one in the oil pickup screen access plug.
Temp sensor for the ECU is mounted in the upper (intake) valve cover on the horizontal cylinder.
But, I'm not at all convinced that the temp sensor is your problem.

The problem started after the ECU was flashed.... so that's the most likely suspect.

[sheepgotoheaven]

Sending off the ECU today just to make sure but a thought came to my head.

Is the stepper motor responsible for keeping the idle at all times or just when cold starting.

I did notice that when i removed the stepper from the throttle bodies that the bike would no longer rev high but would die if no throttle was applied.

If I back out the airbleeds and get the bike to idle normally without the stepper, maybe the stepper would close the flow of air to the throttle bodies when i hook it back in due to not constantly trying to keep the bike alive.

[ducpainter]

I have to agree with Speeddog. The bike was OK until the ECU was flashed.

First rule of diagnosis...always return to the last thing you messed with before you broke it.

[sheepgotoheaven]

So I got the ecu back and the bike is behaving the same as before. I've included a video to better show what's going on.



Bike still hangs at 3k rpm at idle and even when just a bit warm, revs and goes back to normal idle very slowly.

Now next step is to replace the stepper motor?  Should I just buy some old used eBay throttle bodies and pull the stepper motor off of those. Doesn't seem like anyone sells just the motor.

[koko64]

The air bleed screws, how many turns out are they? My Hyper runs the stepper but I could get the idle hanging with more than 3/4 turn. I was advised by a mate here to run 1/4 to 1/2 a turn which ran fine.

[DarkMonster620]

What he ^^^ said . . .

[koko64]

^^^ This guy advised me, he's a Ducati tech.
He and other's have been part of a very helpful community.

[DarkMonster620]

now I'm blushing . . . jajajajajajajajajajajajajaja

edit:
screw the air bleeds all the way in, counting HOW many turns you turned them, now, turn NO more than 1/2 turn each and start bike . .  let it warm up, give it gas 3 times, let it stabilize, how's the idle? At around 1200RPM? NO? Too low, open NO more than a 1/4 turn each, while engine is running . . . Do you have the 1200RPM now? If YES, then, shut it off and let it cool down, have NO idea where you live, so, maybe overnight and try starting next morning . . . NOTHING happened, then get a NEW stepper, PN 28340171A Stepper motor, $981.73 at AMS Ducati

Also, visit this website, http://technoresearch.com/index.php/products/for-single-user/alaris 
If you need some help, tell them I sent you, this tool is what you need if you want to do stuff by yourself, might not be DDS1.0 or DDS2.0 or Mathessis, but, it works

Stepper motor has tests in DDS2.0 or in the above mentioned tool.

Also, check the hoses, for cracks, spray them, with engine running, with some volatile spray, if engine bogs, you have a cracked hose