Author Topic: Rough Idle + Dying at low RPM  (Read 266 times)

Offline brixtonanimal

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Rough Idle + Dying at low RPM
« on: May 08, 2019, 09:15:28 am »
Unfortunately my last post was 2 days ago, problem solved and onto the next one. Iím going to try to document as much as I can about the problem Iíve experienced. If anybody has any feedback, i would find it tremendously helpful, if not, iíll Keep updating as i work through the problem.

Current behavior: The bike intermittently idles roughly. This happens after the bike is warm, but not on startup (even if warm). When coming to a stop, the bike idles alright, then after a few seconds of sitting the rpms begin to bounce between 450-950 in 1 second intervals. If I give some throttle, the idling returns to approximnately 900rpms, and then sets back into rough idle after a bit more time. The bike has died one me one time after accelerating and pulling in the clutch to downshift; on this instance, i had the clutch pulled in for longer than normal giving the rpms time to drop all the way down.

Previous behavior: An unsolved problem that has been going on for a few years, hasnít returned but seems to be related - the bike would shut off on the road when i pull the clutch in for a few seconds. This would typically happen when warm, and often after parked for a bit. An example is if I would go into a restaurant and come back out after the bike had been sitting. It would fire up just fine and a few miles down the road the rpmís would fall extremely low when it should have been idling. It felt very similar to vaporlock that Iíd experienced on old carbureted cars.

I have heard that a potential problem may have been something to do with a thermostat, perhaps the bike is reading a false temperature, not sure.

Any advice in diagnosing the problem would be helpful, Iíd love to get it sorted before the issue becomes larger.

Robert

Offline wytfut

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Re: Rough Idle + Dying at low RPM
« Reply #1 on: May 08, 2019, 04:57:01 pm »
Do you have the super X tune?
If do... I'd hook up and adjust the leakage....... You may have to tweak it up a touch. I'm still not a electronic fuel injection expert, but we had to do that on both of our Xs this past year with very similar symptoms.
I'll be watching for a reply....

My other possible is a fuel issue. As in old, or a partial plugged injector.

Lemme know
Bruce
Bruce
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Offline brixtonanimal

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Re: Rough Idle + Dying at low RPM
« Reply #2 on: May 08, 2019, 06:35:52 pm »
Thanks Bruce, I do have the tune, Iíll talk to the mechanic about getting that adjusted. Separately I will look at the injectors too.  Thanks again for the help

Offline blackheart

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Re: Rough Idle + Dying at low RPM
« Reply #3 on: May 09, 2019, 07:50:32 pm »
On my bike the idle air control valve has never worked well. Typically it would idle extremely high rpm then every once in a while it would idle at extremely low rpm.  Mine has never died but also has never worked correctly has about 15k miles now.

I'd say your issues sound like idle air control valve.  Atlantic doesn't carry them.   Eventually I plan to blank mine off permanently and adjust the throttle position to maintain a 950 rpm hot idle.  Actually I will probably blank the air passage and drill an orifice in the blank for the correct speed such that the zero position of the throttle doesn't change much.
S/N 0307, 14th X assembled factory demonstrator

Offline brixtonanimal

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Re: Rough Idle + Dying at low RPM
« Reply #4 on: May 10, 2019, 10:12:22 am »
It looks like this triumph idle control valve would be a direct replacement. Is that a difficult job to replace?

Idle Air Control Valve 2699-0036 Triumph #T1240888 - not verified

Offline wytfut

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Re: Rough Idle + Dying at low RPM
« Reply #5 on: May 10, 2019, 05:36:17 pm »
The triumph AIC IS NOT a direct replacement...
Sorry....

You may find one that is identical, but it will not be calibrated for our Xs

U can remove it and clean it up. Take it off and cycle it. If it does sound nice and smooth cycle... It need cleaning.

Be very aware to have piece held in garbage bag or can when fooling around with it. The plungers are notorious for blasting off into the putter limits.

Rich..... Did you ask just recently? Curious since we got a flood of parts in ...
Bruce
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Offline blackheart

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Re: Rough Idle + Dying at low RPM
« Reply #6 on: May 17, 2019, 09:01:46 pm »
No that was about a year ago Bruce
S/N 0307, 14th X assembled factory demonstrator