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Rzr 800 idle issues

10K views 15 replies 3 participants last post by  Bunkysdad 
#1 ·
I took it to the dealer and thought it was resolved, but not quite so...Idles fine at about 1,170-1,180ish rpm until the fan kicks on, then engine struggles along at about 1,030 rpm (until fan kicks off) and occasionally stalls....Dealer thinks its the throttle body so serviced it, yet the problem remains... Dealer says it'll take awhile for the computer to re-learn its newest parameters... Not too sure about whats going on....

Bunkysdad
 
#2 ·
Have you checked voltage? How old is the battery? Had it checked? I do know I worked on 2010 last week and it didnt seem to really start charging much until I revved it up,to around 2500-3000 rpm. Once it hit that then it charged fine at idle also. Just a thought.
 
#3 ·
I put in a new AGM just about three days ago, and the voltmeter shows good... been on maintenance charger every since...Dealer says for the time being if it stalls, shut key off and wait 15 sec before restarting (relearn)... I've done this several times but to little or no avail...
 
#4 ·
I'd be curious what the voltage is when the fan kicks on and when the engine stalls. Sounds almost like the fan is pulling the voltage down too low causing it to stall. They do funny things when the voltage drops.
 
#5 ·
The dealer said on their first attempt (100 hr service) that assuming battery is in good shape as well as the charging system too (all checks good...) then its not a voltage but the throttle body, and that the computer should compensate for the idle drop - thus the need after the throttle body cleaning for time to relearn - he said it could take up to 20 hrs but I hope hes right.... he said if it doesn't improve after that to bring it back in for another look...just saying...
 
#6 ·
I will admit i've had mine stall a couple of times but never because of the fan kicking on. My thinking is it definately dropping rpm because the fan is pulling voltage. If I had any doubt in what the dealer told you, then I would check the voltages with a multimeter at idle with and without the fan on, then rev it up and see how the voltages react. But I do somewhat agree with the dealer I've read after messing with the throttle body the ecu has to relearn but I wouldnt think it could take up to 20hr.
 
#7 ·
Well, my thoughts too, but theyve checked and again rechecked the charging system and cannot find any issues except that the former battery was testing marginal (nor did I know its history), so I installed a new battery...I suspect that if it doesnt improve that the next step will be with the throttle body or air mass sensor... Either way, I intend on seeing this through to the end...
 
#10 ·
I don't really know what the idle speed should be, it's a 09, 800s and I only recently aquired it.... It has about 225hrs on it but is exceptionally clean, in fact the dealer was so surprised when I first took it in that he checked the hour meter 3 times!!

Bunkysdad
 
#11 ·
This is out of the 2009 owner's manual. Engine idle should be 1250rpm +- I think it is about 50rpm. Mine will idle at 1200 for about 15 to 30 seconds then climb to 1250 or so. I always let it get to 1250 before trying to gear up and go. i think your problem will go away if you get the idle up to spec.

Mike
 
#13 ·
No, sorry I've never had to change the idle on mine. I have the 09 -10 service manual and I'll try to find something about the idle in, but it probably won't be until tomorrow when I get to it. Heading out in a few minutes with some friends to the Pirates movie. Hopefully somebody else can pipe in with the solution.

Mike
 
#14 ·
#15 ·
I really appreciate all this good information, and it helps me determine what to do...Looks like adjusting the idle and TPS is a wee bit beyond my skill set - lol.... we took the machine out for its first trip over some pretty steep and rugged mountain territory to get to the nearby old time miners town of Carson City, NV, and the machine otherwise ran absolutly spectacular throughout!!....The handling was really quite amazing as well... The machine has nearly 3,500 miles on the odometer and around 225 hrs, but judging by the near pristine visual condition of it and by the way it preforms, I have to believe that its was taken care of and worthy of getting the occasional idle issue properly addressed...so next week I'll take it in for a solid resolution and just be happy with this otherwise fine machine!!.... I'll let everyone know what the repair ends up being ($$ - ouch!)....Kinda makes me wonder just how long these engines are good for...

Bunkysdad
 
#16 · (Edited)
I didn't make a Dealer appointment since after two past attempts the Dealer still seem preplexed...So I cleaned the T-bap using CRC aerisol MAS cleaner and the idle problem got much improved but on about the eighth fan OFF-ON cycle, the engine stumbled then stalled again... This caused me to then 'synthetically' adjust the rpm up from about 1,170ish to about 1,250-60ish by turning the throttle cable nut near the throttle body behind the seat panel...

Once the rpm then settled in at about 1250-60ish, and the fan came ON the idle-stalling problem dissappeared completely (!!) and the engine seemed much smother and much happer at this new rpm!!.... A later check with the dealer validated that the factory idle rpm spec is in fact 1,250....However, although the engine was waaaay happier at 1,250rpm and also quit stalling whenever the fan kicked ON, when I moved it from Park into HI gear the belt began to squeal and the tranny lever was very stiff and reluctant to move...

I later happened to mention this to a quite knowlegable forum member, 'Rush 2252' and he suggested that one possibility is to check for improper belt alignment causing excess drag on the belt - now noticeable at this new higher rpm... Belt alignment was fine, but there was no belt clearance or play at the primary side - it was tight (not good)...Rush said it should not be tight and to take the belt off to see if the pully center bearing was turning freely as it should - I did and found the center bearing was froze and markedly pitted, causing the squeal at the new but now normal idle rpm of 1,250...Thank You Rush!!!!

So I removed the primary clutch using a clutch puller ($35 at dealer) and took the clutch to the dealer for rebuilding...

So what happened??..... I'd just recently purchased the machine but did not know its history... Apparantly, the belt had began squeeling for the previous owner, and rather than addressing it, he likely lowered the idle to below spec to a point (1,170ish) where the belt squeal went away... The machine still ran perfectly, except that at this lower 1,170 ish idle speed, it would stall out whenever the fan decided to kick ON!...

Many Thanks to the RZR Forum, and especially to AWESOME forum member 'Rush 2252' for patiently guiding me through to determine the true root cause of this idle problem, a cause that even elluded the willing and reputable Dealer!!

Best Regards,

Bunkysdad
 
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