Setting the Idle Air Control Valve - Page 4 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #31 of 33 (permalink) Old 07-12-2019, 03:35 AM
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Originally Posted by Steve Ford View Post
There's just an O-ring on the piston ... .
Don't believe there is any o-ring on the piston
@chickenstrip - maybe you just need to start by explaining your problem
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post #32 of 33 (permalink) Old 07-12-2019, 05:08 AM
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Come to think of it, you're right, there's no O-ring.
It went the way of all flesh a long time ago.
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post #33 of 33 (permalink) Old 07-12-2019, 08:29 PM
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Thanks for chiming in Steve and DEcosse.

I got that notion from this thread.

6. Remove and save the o-ring on the stepper motor. Inspect the stepper motor plunger for carbon and/or oil buildup and dirt. You can use carb-choke cleaner to clean things off, or put some brake cleaner on a lint-free rag. Blow off the plunger well with air, making sure it's dry. Blow out the electrical connector. If excessive oil was on the plunger or case, you'll want to remove the vacuum lines from the throttle bodies and blow them out with carb-choke cleaner and air.

I've never dug into the ISCV (IACV - why did they change the name?) before and I haven't a pic to show me what the innards look like, so I'm poking in the dark.


Symptoms: Idle is at about 900 rpm - quite anemic, so I find myself 'nursing' the throttle to ensure it doesn't stall, which it does occasionally.

I've tried some easy-to-do possible fixes: cleaning the injectors with Techron and replacing the cracked ISCV hoses. The latter had me thinking that I solved the problem as the engine idles at 1200rpm for a minute or two, but then returns to the low idle.

So I was thinking the next step would be to check out the ISVC stepper since I've read that that solved the problem for some, and do a TBS while I'm at it - made a nice DIY manometer yesterday.

I'm happy to hear suggestions.

2002 Sprint RS: TOR silencer, LSL bars, Laminar lip, factory tail rack with Givi top box, custom painted OEM panniers (one of 'em anyway - sad story), M-Factory lowered pegs, Penske shock.Thanks for all the help, Kit!

Last edited by chickenstrip; 07-12-2019 at 09:42 PM.
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