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Old 07-07-2013, 09:27 AM   #1
Rockwell OP
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Low Idle Upon Start

I've just been noticing a low idle just after I start the bike up. It idles at under 1000 rpm and, after about 5-10 seconds, the idle comes up to a normal 1400 rpm.

I have only noticed this recently.

What should I be looking into for something like this?

I have a 2007 990.

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Old 07-07-2013, 11:23 AM   #2
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Just did a search (couldn't search on the app I was using when I posted). Going to look at the throttle position sensor in TuneECU when I get a chance. I've read that it should be between 0.5-0.6V.
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Old 07-08-2013, 04:49 AM   #3
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This past weekend I adjusted my TPS sensor, if you set it to 0.66v on a cold motor it should stabilize at 0.6v (spec is .54v to .64v) at operating temp. Also, check your throttle cable adjustment.
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Just did a search (couldn't search on the app I was using when I posted). Going to look at the throttle position sensor in TuneECU when I get a chance. I've read that it should be between 0.5-0.6V.
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Old 07-08-2013, 10:23 AM   #4
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Quote:
Originally Posted by Rockwell View Post
Just did a search (couldn't search on the app I was using when I posted). Going to look at the throttle position sensor in TuneECU when I get a chance. I've read that it should be between 0.5-0.6V.
Set it at 0.60v with a warm engine. Don't look at the cold value as it varies from bike to bike. And see if it does it for you.
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Old 07-08-2013, 10:37 AM   #5
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I've skimmed through a few threads on the throttle cable adjustment, and there seems to be a bunch of arguing in the ones I've read through.

Just to confirm - for this adjustment, I will want to:
  • turn the key switch to ON
  • connect my computer to the ECU using TuneECU
  • set the idle stepper motor to position zero
  • adjust throttle cables so that the feedback voltage reads what is specified by KTM (around 0.6V)

A warm engine means 4 bars on the temperature readout (on '07 990)? I've read also in one thread that the bike should be run for about 30 minutes also before doing this. Is this necessary?
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Old 07-08-2013, 10:44 AM   #6
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The tps and the throttle cable slack are two different things

The tps is adjusted by loosening the front tps (held by one bolt) and by moving it ever so gently so that you read 0.6v in tuneecu. Then tighten the bolt (or you'll see the voltage move again). Repeat until you have the correct voltage once tightened up.

I've warmed the bike up until the fans kick in then proceed with the tps adjustment. Many miles after, it's still spot on. I don't see the need for a 30min ride. But it wouldn't hurt to ride it a bit and then do the adjustment.

The throttle cable adjustment is purely to compensate for the slack and if you don't like the free play on the throttle.

Hope this helps.
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Old 07-09-2013, 02:31 PM   #7
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Thanks for the info. I guess I thought that the throttle slack could effect the feedback voltage of the throttle position sensor (if it's too tight, it might read a higher value?).

I quickly hooked up the laptop today to the ECU and the TPS voltage read 0.62V, but I'm going to need to do a bunch of reading on this before I get too much into TuneECU and adjusting anything.
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Old 07-09-2013, 03:13 PM   #8
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One other issue to mention that might be related is that my tach needle wavers up and down by a few hundred rpm at idle when it does finally lock around 1400 rpm. I have also noticed recently slight surging at low gears and while maintaining a steady throttle position.
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Old 07-09-2013, 04:13 PM   #9
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My 990 has the TPS set at 0,63/0,64v engine warm (operating temperature, 4 bars). No hesitation whatsoever, fast through the revs, not flat spots and mileage is quite affordable too.

How is your bikes TPS voltage before touching it?

Less than 1000revs is too low for this engine. When cold starting it goes up to 1850 and then idles at 1450.
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Old 07-10-2013, 06:43 PM   #10
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Did the 15 minute idle today and it seems to have made idle off the start better. I'll have to give it a few days to really see. Still getting some surging though. Going to have to look more into this throttle position sensor stuff when I get a chance. We're on the road, and it's hard to find time to read up on these things, let alone find a place to work on the motorcycle.

One thing I am going to look into soon is the splices I had to make to some small control wires a few weeks ago. Seems that a cable rattled loose from its cable ties and leaned against the exhaust. I lost all power to the bike, and, luckily, I was only 300 meters from the place where I was staying. I did some troubleshooting a found a short to ground just after the blown main 30A fuse. Looked up and saw a cable cooked against the front exhaust header. I did a splice of about three small-gauge control wires and wrapped everything back up. Since then, I have noticed this surging. Maybe just correlation and not causality, but I'm going to have to look at what exactly the wires were in that conduit and wether or not the connections are OK since I didn't use solder.
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