I just purchased a 2012 commander 800 it has a few issues, it keeps throwing the code p2279 wich is a air intake leak. I have replaced every o-ring on the intake and resealed the airbox. The plenum isn’t cracked or leaking anywhere that I can find I have used the propane method and ether spraying the whole intake system with no change in the idling wich it won’t do unless I hold the fuel pedal halfway in. I’ve changed the mapts sensor and the throttle body, new spark plugs fresh fuel and all, and it seems as only the front cylinder is firing, the rear exhaust doesn’t get as hot as the front after idling for a few minutes but if I unplug the boot off the plug it will eat you up lol any ideas?
Switch the plugs from front to rear and see if cold exhaust moves with the plug. You may have a faulty injector in rear cylinder casing it to flood and keep cylinder cooler. Were you able to set the throttle position sensor properly. If not it will not idle or will idle to high rpm.
I’ve swapped the plugs coming off the coil and can’t even get it started that way, I can unplug the rear cylinder off the coil and there’s no difference it the way it runs when I get it to, not sure about setting the throttle position sensor, I have a manual on pdf and have read it pretty thorough haven’t seen anything about it unless I missed it somehow. Thanks for the response also.
I was referring to the spark plugs . Not the wire plugs . I know you replaced them . But wouldn’t be the first time one was dead out of the box. You said you replaced the throttle body . The tps is in the throttle body. And has to be set after replacing the throttle body.
Thanks for your all’s help, sorry about the intro I’ve been working on this thing for a couple weeks. I live down in southern wv I have several ATVs and a Honda pioneer 1000-5 already couldn’t pass the deal I got on this on up.....what I read in the manual it says u have to take it to a dealer for them to hook the buds system to it to do a tps reset, is this correct?
? I hear ya, the HM trails seem to have took over in the last couple years....I’ve been riding these mountains long before they came along.....I might buy a pass one day lol
Finally got a chance to check it out today, fuel pressure is 51#, swapped the plugs from front to back and still a semi cold exhaust in the rear. My next guess would be an injector. I can check voltage from the coil and both cylinders measure about the same with my meter they range from 14-19 volts when firing also I can unplug the rear cylinder from the coil and it doesn’t idle any different. Any one else’s thoughts? I also installed the old throttle body with the same results.
That’s what’s strange to me, it idles almost perfect but the cylinder is dead, both cylinders have great compression but like u said about 4K rpm is it and if I try to ride it it goes into limp mode as soon as I pull out. I may just end up ordering a coil both wires and 2 injectors.....I hate to throw money at something and not know exactly what’s wrong with it before hand.
Swapped injectors out today, with no change....the rear cylinder exhaust still doesn’t get hot like the front one and still the p2279 code....just brainstorming but could the valves be out of spec and need adjustment and cause this problem?
I can still roll it easy, until the lobes hit. Everything seems to be tight and still in good shape from what I can see. I’ll have to order a primary and secondary clutch puller to go any deeper. Hopefully it’s just a cam chain I’ll pick up a compression tester also before I pull the head for no reason. Something had to make the cam chain break?? It only has 2700 miles on it. I’ve rebuilt several 2 and 4 strokes engines from the crank up but never a twin cylinder. I don’t see how it idling and riding around the yard the cam chain didn’t get wadded up in something and cause serious damage guess I’ll find out real soon
Good luck post up some pics when you pull the cover off as to where the chain ended up. Please very curious as you are why it didn’t destroy everything. Definitely need to do leak down test too see if it bent valve .
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