6th Gen Idle issues PLEASE HELP THE NEWBIE ! ! !

Hi, My name is mike, Im a newbie to VFR world but im on my 2nd VFR ( the first was a 1993 VFR 750F that my brother stole and totaled) I was hoping that I could bounce an issue by you guys , and you could share some of your knowlege with me as to where I should start looking.

I just got a 02 VFR 800 with 14K on the odometer the only mod is a scorpion exhaust, (I love my 2nd annv. gift... makes me wonder what next years is going to be... lol )


I'm having an issue with the idle on it. When I start the bike it idles at 1500 to warm up, once the temp gauge shows about 110 give or take a few degrees the idle starts to slowly creep up to around 4000 will hold there for about 10 to 15 min then it will suddenly start to flux between 3000 and 4000 for about 5 minutes then it will go to 1500 again and stay there. so its running high from about 20 min. when riding during that time frame she runs like new till you pull in the clutch at a stop light then it goes up. then BAM! youll pull it in again after that time frame at a light and it stays at 1000 - 1500.... like nothings wrong.

When I ride the bike she still runs like a new bike, no lag or acting up at all,no smells not running rich or lean, still smooth idle just high for that time frame. idle stays high after i shut down and immediately restart, no "FI" lights or trouble codes. funny thing is the idle issue only happens when its a 100% cold start like sitting over night. i can ride for a while shut her down let her sit till cold again start her up and doesent do it, just when she sits over night.


she runs about 150 - 190 temp wise with it going up to about 200 when sitting at LONG stop lights, All fluids are FRESH and topped off, NEVER DROPPED, and is having the recall work done as i type this. I dont want to take it to the dealer as they charge 110.00 and hour to diagnose and labor hour.



I hope some of you have delt with this issue and can give me atleast a basic idea of where to start with this.


Thanks In Advance

Mike

 

Two simple things come to mind. Make sure your throttle cable has some freeplay and check the routing for binding when the handlebar is turned. The other thing you might try is...after the warm up period, turn the idle speed down to 1200-1300 RPM. 1500 RPM is too high.

 

Those are good ideas. Good luck, I hate problems like this.

 

Perhaps the fast idle wax circuit is mucked up?

 

Well sorry I havent been on in a while... damn work...LOL.... Well i pulled the tank and checked every single vacuum line on the bike, there are no cracks, kinks, breaks, holes, or even loose fittings. as some have suggested. ant the bike is still doing it. and a new symptom has emerged that from time to time when you start it, it wont stay running unless you have the throttle cracked by hand. then you shut it off wait 5 min then she fired and runs normal.... and no matter when the bike is running if you turn the idle screw knob all the way in iether direction it doesent adjust the idle at all... so im seriously stumped and dont want to pay honda 110.00 an hour just to look at it, muchless what they would charge to work on it.



Im thinking maybe the wax unit on the fast idle???

 

Sounds like you have something going on. Wax unit is a possible failure. In order to go further you might want to remove the airbox bottem and have a look at the throttle bodies. Make sure the butterflies are working properly, with the cable. If you do access it while the machine is still hot, you should be able to observe that the wax unit has closed the starter valves. If you come back a few hours later, the wax unit should have deflated, shortening the shaft and your starter valves should now be open. There's a definite change in the length of the shaft connecting the wax unit and starter valves from hot to cold. If none is observed, you may want to replace the wax unit.

 

some o2 sensors work like shit when cold (relitive term) and once they get warmed up they are fine. this may or may not throw a code(light the FI light) and if someone has done an o2 sensor delete on it then the bike will do weird things when cold. this can be checked by your honda dealer, or you can buy the obd reader and do it yourself. this will also let you do other tests and checks. If you can check the wax unit when hot, the valves it controls should be fully closed. 3 of these are adjustable. do not adjust these unless you know for sure they are the issue as the wax unit itself may be the issue. the idle control knob in my experience only works when the bike is hot and only adjusts about 300rpm. check that it is hooked up and that the base idle screw is set properly.

the best thing you could buy is the handa service manual. it has the procedures to fix/check and some diagnostics info that will make this fight easier.

 

Dude, there's a commercially available scanner for 6th gens...........DETAILS PLEASE, I must have one...............oh yes, it will be mine..............


edit: sorry for the thread hijack Gunny, :welcome: