My '07 S2R1000 has a weird rough idle sometimes when i stop at lights or first start the bike. if i tease the throttle i can even it out and it's fine. doesn't seem to be a rhyme or reason to it, but a friend told me that it might be a dirty mass air flow sensor. I looked in the airbox where he told me it would be and I see nothing. Am I barking up the wrong tree?
Your bike does not have a mass-air-flow sensor.
Odd idle issues on the S2R1000 bikes are usually attributed to the idle air control valve. It's bolted between the throttle bodies and has a short elbow hose to each attached to it. Coming out of the top of it is a longer hose which attaches to the bottom of the airbox.
If you're running the stock ecu, then the odd idle could also be attributed to the oxygen sensor in the exhaust. The S2R1000 was Ducati's first closed-loop fuel injection system and it had a hard time idling. Some people even got dealerships to warranty replace the factory ecu with the Ducati Performance unit.
If you've got the stock ecu and oxygen sensor, you can try disconnecting the oxygen sensor to see if that smooths out the idle somewhat. Don't ride around too long w/the oxygen sensor disconnected though, you'll foul up the sensor (should you care). This 'mod' will also trip the check engine light to come on but in some cases it has been known to smooth out the idle.
"Idle air control valve" is the stepper motor?
I looked at the parts catalog the other day and wondered why it couldn't just be removed...
Probably not as simple as that, but what controls the valve/motor?
Yes, stepper motor. The throttle screw becomes a base setting and the air bleeds cylinder balance. Could it be removed? Yes, but not so easy, plus the stepper motor also controls cold start and warm up speed.
Electric and taking orders from the ECU? (doesn't look like that, so I ask)
Quote from: stopintime on December 02, 2013, 03:57:51 PM
Electric and taking orders from the ECU? (doesn't look like that, so I ask)
Yes and yes.
It can be removed, and the throttle bodies set up and synced as one would do on earlier models.
Problem is that the 'fast idle' mechanism is not present on those throttle bodies.
Usual countermeasure to that is fitting an SBK throttle grip assembly, those have a pushbutton fast idle.
Quote from: Duck-Stew on December 02, 2013, 02:50:09 PM
If you're running the stock ecu, then the odd idle could also be attributed to the oxygen sensor in the exhaust. The S2R1000 was Ducati's first closed-loop fuel injection system and it had a hard time idling. Some people even got dealerships to warranty replace the factory ecu with the Ducati Performance unit.
If you've got the stock ecu and oxygen sensor, you can try disconnecting the oxygen sensor to see if that smooths out the idle somewhat. Don't ride around too long w/the oxygen sensor disconnected though, you'll foul up the sensor (should you care). This 'mod' will also trip the check engine light to come on but in some cases it has been known to smooth out the idle.
Ah HA! I have termignoni full system on it from the P.O. and noticed that the o2 sensor is not hooked up to the mid pipe. Think that's what i'm looking at?
Quote from: superkain on December 03, 2013, 12:30:18 PM
Ah HA! I have termignoni full system on it from the P.O. and noticed that the o2 sensor is not hooked up to the mid pipe. Think that's what i'm looking at?
The DP ecu eliminates the oxygen sensor and runs the bike on an 'open loop' or without oxygen sensor feedback. If you have the DP ecu and are still having idling problems, then perhaps removing and cleaning the stepper motor would help. Also, 2V efi Ducati's develop carbon 'rings' around the throttle blades which can hurt idle performance. If you remove the airbox lid & filter and crack the throttle while looking down the horizontal intake you can usually see if you've developed a carbon ring.
Cleaning those is simple with cotton swabs and brake cleaner. Just takes a few minutes.