Fast Idle Adjustment, Pointy.

Hello, I have a faired k5, 24K kms.
Stock exhaust, stock air filter, no PowerCommander, no adjusting TPS.
Just was limited with a kit in the throttle body, and not in the ECU. And now it is at full power.

My SV goes fine, at least, until you start it in a cold place and it has stayed there for a while(enough to show -- in the temperature indicator).

The idle is set to 1300-1400, when the engine is warm.

What happens is that it starts, but you have to use the throttle a bit to make it possible. If you just hit the clutch and press the button, the engine will try to start but wont hold(in warm places or in summertime it start's without any problem and without using the throttle).

Then, when you have it running and you stop using the throttle, the revs fall in a few secs, nearly to 1k and after that will stall.

If you retry it will do it again, unless you hold the throttle until it has warmed up to 25ºC(77ºF) or so.


I've searched the usera manual, and found the notes about fast idle, revs and temps, and my bike has never run like that, meaning of fast idle. You start it, and it runs to idle, in any condition.

I've also searched the forum, but I didn't find nothing about how to adjust it. Or someone with the same problem, being told to touch some screw to fix it.

I've also read in the user manual that you have to measure the voltage in the throttle body and then adjust a screw to fit the standard. And after that check the idle.

I'm a bit lost with that indications.


Please help.


**Forgive my poor english.

Greetings.

I have this exact same problem, i gave the throttle bodies a balance (first time in 25k) and it seems to have cured my problem to an extent. However the fast idle only cuts in for about 30 seconds but is enough to warm the engine up enough to avoid stalling. I have also got my idle set high to about 1500 and have no problems with this. Just a bit buzzy when sitting at the lights. Hope this helps,
Matt

[andrewsmith]

as SVmat may require a balance and a service.

What temperatures are you talking for cold starting and where you based

[yorkie_chris]

Fast idle on the later bikes is controlled by the STV servo, might be worth checking this is all operating correctly.

Originally Posted by andrewsmith

What temperatures are you talking for cold starting and where you based

About 10ºC. I'm afraid that as winter approaches and temperature keep going to lower values it will get worse.

By the way, if you hold the throttle until it's warm(25ºC, 77ºF), and you use it to start the bike there's no problem. But I think that FI is supposed to be installed in bikes to avoid that kind of problems, and if I can fix it it's better.

Originally Posted by andrewsmith

as SVmat may require a balance and a service.

What kind of service? You know, I do oil and filter changes on my own, and check everything that would be checked in a typical service(light's, chain, tires...). I don't want to go to the suzuki service, asking for a solution to my problem and come back with a 200€ bill, and if I could solve it by myself... you know.

It's the same with the TPS if you check it it's (probably) with a wrong setup... so what? Ask to Suzuki service again?

I bought the bike from second-hand(so the cheaper the better) and it has run fine, but has this little annoying things that if I could I would fix.

Thank you all for replying.

Originally Posted by yorkie_chris

Fast idle on the later bikes is controlled by the STV servo, might be worth checking this is all operating correctly.

It's a K5, in the user manual it doesn't talk about servos... by the way I don't know...
I think it has been changed from K7 or K8 and on.

[andrewsmith]

Originally Posted by capitanscott

About 10ºC. I'm afraid that as winter approaches and temperature keep going to lower values it will get worse.

By the way, if you hold the throttle until it's warm(25ºC, 77ºF), and you use it to start the bike there's no problem. But I think that FI is supposed to be installed in bikes to avoid that kind of problems, and if I can fix it it's better.

What kind of service? You know, I do oil and filter changes on my own, and check everything that would be checked in a typical service(light's, chain, tires...). I don't want to go to the suzuki service, asking for a solution to my problem and come back with a 200€ bill, and if I could solve it by myself... you know.

It's the same with the TPS if you check it it's (probably) with a wrong setup... so what? Ask to Suzuki service again?

I bought the bike from second-hand(so the cheaper the better) and it has run fine, but has this little annoying things that if I could I would fix.

Thank you all for replying.

With a FI you shouldn't have to hold the throttle open during warm up, as the system should do that until the engine sensors say its warm enough to idle.

If it costing 200 euros a service i can see why you want to solve it.
You got a Haynes or similar workshop manual?

I have the user manual from suzuki for SV K5 model. And a downloadable version with more info than the printed one it came with the bike.

As I wrote before in section 5 "Fuel system and Throttle body", page 5-31(Fast Idle Inspection) and 5-32(Fast Idle Adjustment), we can read something about setting it up and checking if it's right. But when I looked at the table of temperatures-revs during warm up... it's like "well, not in my bike".

So I wanted to know if someone has touched it, like the TPS that has even a tutorial about it or something.

By the way I should:
- lift the tank,
- put away the airbox, then
- "Disconnect the STVA lead wire coupler and turn the ignition switch ON ", after that
- "Open the STV fully with a finger . Measure the output voltage of the TP sensor", and finally
- "If the TP sensor output voltage is out of specification(1,21V), turn the fast idle adjusting screw (1) and adjust the output voltage to specification"

First of all, I dont know for sure, Ignition switch is the red button in the handle bars, isn't it?, after that, opening the STV with the finger has any info or warning I should know before broke something?, and finally, when I check the Volts in the TPS, I haven't figured out how because if it's precise the way it's told it should be protected from short circuits and direct contact with the outside... and I don't know how to operare the cables to measure it.

I have opened an removed the airbox several times, and I have knowledge of electronics, so it's not being afraid, it's just I don't know the whole proccess and what could go wrong before doing it.


** It's not 200€ for sure, but you know, 45€ and hour of work in suzuki, and something they find in it that it's "broken", and of course warranty expired... If I can fix it with my multimeter and an afternoon of getting dirt with the bike it's better.

[yorkie_chris]

Originally Posted by capitanscott

It's a K5, in the user manual it doesn't talk about servos... by the way I don't know...
I think it has been changed from K7 or K8 and on.

As far as I know, if it doesn't have manual fast idle lever (and cam on throttle bodies) then it will have the STV operated one.

I think just K3/4 had manual lever.

All sounds like it might be dodgy sensor to me, is there any diagnostics software for the Fi SV? I've had it for a Triumph and now my Ducati and you can actualy see what all the sensors are telling the engine, makes finding these problems alot easier.