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Hi, guys...
I'm having a real issue with the idle speed on my XJ. It refuses to remain @ 1100 rpm... it will for a few minutes, then soars to 3000, you can barely move the idle speed adjustment and blip the throttle, and it'll come back down... too low... set it back to 1100, it'll stay for a few, then soars again.
It's been a pain like this since I got the bike back in Jan.
Been through the carbs, checked, cleaned, and blew air through every orifice, been through all the levels, adjustments, synch procedures more than once... still the problem persists. I have 4 new float valve assemblies on order, which should be here in a few days... but doubting now that the issue is really "carb" related.
I'm trying to figure out how the '82 XJ1100's electronic timing advance system works. I have located the Vacuum Boost Sendor, located under the tank, (which has a vacuum hose that goes to the carbs.) I have also found the page that shows how to check it, which initially has passed the check.
But, it appears to be a replacement item... and I need a source! Anyone ever have an XJ issue like this, and replace one of these to fix?
(Knowing how electronic parts act when they get hot...)
I'm also trying to get the circuit in my head... does the TCI on the XJ control timing advance, by changing signals sent to the coils? Thinking it gets it's base timing signals from the pickup coils (which are on a fixed plate) and the other from this Vacuum Boost Sendor based off of engine vacuum, sends those voltages to the TCI, which controls the coils. Is this correct?
It's seeming more like a timing advancement issue... it has always taken a few seconds to let the rpm's fall before it goes back to idle... now it not only sticks and doesn't want to come down, but it will be idling ok sometimes, then soar by itself like it's possessed! LOL
Thanks "in advance".
Bob
I'm having a real issue with the idle speed on my XJ. It refuses to remain @ 1100 rpm... it will for a few minutes, then soars to 3000, you can barely move the idle speed adjustment and blip the throttle, and it'll come back down... too low... set it back to 1100, it'll stay for a few, then soars again.
It's been a pain like this since I got the bike back in Jan.
Been through the carbs, checked, cleaned, and blew air through every orifice, been through all the levels, adjustments, synch procedures more than once... still the problem persists. I have 4 new float valve assemblies on order, which should be here in a few days... but doubting now that the issue is really "carb" related.
I'm trying to figure out how the '82 XJ1100's electronic timing advance system works. I have located the Vacuum Boost Sendor, located under the tank, (which has a vacuum hose that goes to the carbs.) I have also found the page that shows how to check it, which initially has passed the check.
But, it appears to be a replacement item... and I need a source! Anyone ever have an XJ issue like this, and replace one of these to fix?
(Knowing how electronic parts act when they get hot...)
I'm also trying to get the circuit in my head... does the TCI on the XJ control timing advance, by changing signals sent to the coils? Thinking it gets it's base timing signals from the pickup coils (which are on a fixed plate) and the other from this Vacuum Boost Sendor based off of engine vacuum, sends those voltages to the TCI, which controls the coils. Is this correct?
It's seeming more like a timing advancement issue... it has always taken a few seconds to let the rpm's fall before it goes back to idle... now it not only sticks and doesn't want to come down, but it will be idling ok sometimes, then soar by itself like it's possessed! LOL
Thanks "in advance".
Bob
(Sold back to Maximan)
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