View Full Version : Cough through the tb's
06-22-2003, 10:11 AM
Has anyone experienced an intermittent cough through the throttle bodies at low rpm's/low speed, with irratic rpm's at idle? I have the air bleed screws out about 1/4-1/2 turns out, full Arrow exhaust, rsv titanium chip, and Evo race airbox kit, and fuel pressure is set at 44 psi. Any suggestions?
06-22-2003, 12:06 PM
IIRC, it's a full turn and then a quarter or so for the air screws... Might be you're running way rich...
06-22-2003, 12:40 PM
i concur with dave they need to be opened more, maybe bring them both to 1 turn as a baseline. in the falco forum there is a good set of instructions on this procedure that was sucessful for me, basically turn screw until it no longer allows idle to rise(either open or close) then go to idle thumb screw on right side bring idle under control and do the same for othe cyl.
06-22-2003, 06:38 PM
Thanks for the advice. Once it cools off here tonight in Phoenix, it's only about 105 outside right now, I'll check to be sure how far the air bleed screws are out. Thanks again.
06-22-2003, 11:31 PM
Anyone know where these screws are on a Tuono? How do I get to them? Could running rich or lean cause backfiring if the throttle bodies were just adjusted at the 600 mi service?
06-23-2003, 06:02 PM
Its a sync problem in my experience and I would agree with others that your fuel screws are in a bit too much for starting point. I've also found that having the front cylinder pulling slightly more vacuum worked better. My digital sync tool makes it easy. Your still welcome to use it.
00 Aprilia Mille "R" - Stage 1
06-24-2003, 12:18 AM
Just to update my situation: One thing I found was that the vacuum plug that that goes onto the vacuum port when using the adjustable fuel pressure regulator was missing. The other thing I did was remove one of the spark plugs to check the condition-these plugs "were" new about 200 miles ago. They were almost black! The next thing I did was check the TPS sensor, and it was at "0". Next I turned out the air bleed screws to about 1 1/2, and started the bike, warmed it up, then adjusted the screws to make a smooth idle. Then went for a test ride. No more coughing, and smooth throttle response. Next thing is to call the dealer and tell them how great a job they did when I took it in for the throttle body sync. and when they adjusted the c.o.'s, and nearly fouled out a set of Denso irridium plugs, and made my fuel mileage go to hell!! I guess I just need to stop being so lazy and fix my own stuff! Thanks again everyone for their input.
06-24-2003, 12:26 AM
Where are you, Grizz? What dealership?
06-24-2003, 01:03 AM
I won't be disclosing who the dealer is. I still want to be able to go to them when I need to. Perhaps the mechanic just didn't have much first hand experience with any performance enhancements on these types of bikes. I'll just limit what I have them do next time, if their is a next time.
06-24-2003, 09:23 AM
How about where you live?
06-24-2003, 08:19 PM
Considering most area's only have one dealer whats a guy to do? I can tell you that the dealer in question is not in your neck of the woods. Heck, you've got 5 to choose from! I can tell you which NOT to go to for service....Milpitas
Arizona (formally San Fran)
00 Aprilia Mille "R" - Stage 1
06-24-2003, 09:26 PM
Thanks Chuck, I owe you one, or two!
06-24-2003, 09:31 PM
That was what I wanted t'know. Thanks Chuck.
06-24-2003, 09:59 PM
HOM always had great prices on stuff when I had my vfr...
Never had any service done though.
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