02-09-2018, 02:25 AM
(02-08-2018, 11:03 PM)Dave_imp Wrote: Update: I thoroughly re-cleaned the TPS connector last night and took the bike for a ride around town. 5 miles into the ride the low idle condition (700 RPM, slow return to 1,050 RPM, but no stalling) returned. So I thought really hard about what could have changed to bring on this condition, since the bike ran perfectly last Sunday, Monday evening, and Tuesday evening, and I think I have hit on something, and that is the gasoline. I refilled the tank Tuesday evening, putting 3.94 gallons in it. Wednesday evening, after driving almost 60 miles on the freeway, the low idle condition returned as soon as I exited the freeway (it may have returned earlier if it wasn’t for the freeway driving, where the problem does not occur). I most always buy my gas from name brand stations, but occasionally, like last Wednesday, I filled up at a 7-11 station, where there wasn’t even a name on the brand of gas. I always purchase the premium grade. Here in California we have what is called “summer blend” and “winter blend” gas, and the difference being the Reid Vapor Pressure. So on Saturday I am going to drain my tank and refill it with gas from a Chevron station, where I normally buy it in my neighborhood, and see what happens. Do any of you guys have any thoughts on this? I can’t think of any other variable that changed from Sunday, when the bike ran perfect, to today, with the low idle condition. Can you please post your comments? Thanks again for all your help guys!
(02-08-2018, 09:41 PM)peterbaron_imp Wrote: Dave,
"AS" forget about this...it should be written ..."as" far as to PCSV....
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1* test condition:: on center stand, engine hot/normal operating temp and NORMAL RPM (1050)..if for any reason is not within specs, wait until it stabilizes within..
2* disconnect THICK/YELLOW vacuum hose end **that goes from PCSV to Th. body/intake manifold = this will create vacuum leak or as if PCSV were stuck in open position (normally closed) and register RPM change....it may very, so watch it for a while..
** careful, not to break nipple to PCSV
Unplugging the electrical connection will not be the same thing as removing the hoses (Popgun is perfectly correct)
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YELLOW SKINNY HOSES DISCONNECTION...might be more difficult to achieve , since there is less access to inner throttles ??? have a look..
Max is recommending that I disconnect the two EVAP ( skinny vacuum hoses/yellow & blue, linking each th. body, Honda calls'em MAP vacuum hoses) system hoses (hoses identified with yellow marks in previous post), and I assume that this is the same thing as the PCSV?(..generally, all seems to go to intake manifold) . This seems like a pretty simple test that I can do. If my bike is running fine (1,050 RPM, warm idle) and I pull off these hoses what should I expect = YOU SHOULD SEE RPM CHANGE...watch for a while what is happening with RPM...may go up, down...
Let us know, please... before next step as per Max/SportsterDoc/Popgun
pb
Dave, while I can't answer the question, I can report on my last 5-6 weeks with my bike after I had cleaned the TPS connection.
Before doing the TPS cleaning, I had taken the bike into a dealership and they were trying to help with a few ideas before I committed to letting them have a go at finding the problem...which I never gave them the chance to do. The service tech said try the highest grade gas at Chevron for a few fills to see if that would help. He said that it wouldn't be the first time that idle issues that he sees from time to time were alleviated by better quality gas. Till that point I had filled wherever was convenient and cheap. So I switched to higher grade gas at Chevron at the same time the TPS was cleaned, and as I've mentioned before, the problem didn't return for 8 half-hour to two hour rides with exception of two dips to 900rpm, then back to 1000 with fully warm engine.
At times I'm sorry I didn't stick with the bike just for wanting to find out what it could be, but I got tired of the mental "high/lows" as well as the idle's.
What I find perplexing is that some members here report that their idle issue simply "went away" after some time...and never came back. If there is a defective TPS, ECU, IACV or whatever alphabet part, why would someone's issue "go away" unless it were something simple like loose / bad TPS connection, loose hoses, or.... "inferior" gasoline? So strange...but others more knowledgeable will chime in.
Continuous "get well" wishes for your CB.