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Yet another rough idle on a 2012 RT
I have a 2012 rt that started surging and almost stalling. RPMs bounced 1k-2k. It felt like a fouled plug under acceleration, sluggish until the rpms were up. I removed the purge valve line form the evap canister and plugged it with a bolt and tape. I fired it up and it idled pretty smooth for about 10 min but went back to idling rough once it got warmed up. Surging wasnt as bad but still up and down rpms. I am gonna drain/replace the gas but im guessing that gas isnt the culprit or it wouldn't idle smooth at all. I would like to try replacing the vacuum lines next but I can not find any instructions (videos or pics). Can anyone point me to them if they exist? Also, any other input is appreciated.
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Very Active Member
Last edited by CopperSpyder; 06-29-2019 at 11:18 AM.
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Sounds like vacuum hoses like Copper said. I don’t know if those links suggest using hose from Napa instead of the BRP hoses, but I’d recommend Napa.
2017 F3T-SM6 Squared Away Mirror Wedgies & Alignment
2014 RTS-SM6 123,600 miles Sold 11/2017
2014 RTL-SE6 8,600 miles
2011 RTS-SM5 5,000 miles
2013 RTS-SM5 burned up with 13,200 miles in 13 weeks
2010 RTS-SM5 59,148 miles
2010 RT- 622
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Very Active Member
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Thanks for the quick responses. Dumb question but does the air box have to be removed to replace the lines to the throttle body? I switched to fresh gas and checked the map sensor hose (only found one) and it looks brand new, no cracks or discoloration. I just got back from a test ride and it ran ok above ~2500 rpms but still idled pretty rough. Will it damage anything to ride it like this for the weekend or should I park it so it doesn't foul a plug, stall and won't start, etc?
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Very Active Member
The hoses are both on the left side of the throttle body. The one to the rear is easy. The front one can be replaced with the air box installed, but will take a little grunting.
Will it hurt to drive right now. Sorry, but I dropped my crystal ball. Can't help there.
2011 RTS (Sold to a very nice lady)
1998 Honda Valkyrie
2006 Mustang GT. Varooooom!
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Experience is recognizing the same mistake every time you make it!
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Thank you. I cant seem to locate the darn thing. Is the left side facing the bike or on it? I feel kinda dumb not locating it. Maybe its easier to define it as the side with the brake or the shifter?
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Very Active Member
Left side as you are sitting in the riding position .
You will need to get down on your knees, look directly at the throttle body and below the air box.
2011 RTS (Sold to a very nice lady)
1998 Honda Valkyrie
2006 Mustang GT. Varooooom!
US Navy Veteran
SC Law Enforcement Boat Captain
CNC Machine Service Technician
President: Rolling Thunder SC1
Member: Disabled American Veterans, Rock Hill, SC
Member: American Legion
Experience is recognizing the same mistake every time you make it!
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