04700EFI Runnin' rough...suspect one cylinder not firing...

[rangertom]

Anyone had this problem? Mine has 1300 miles...I bought it new...and this problem just happened a couple days ago. I've yet to do some investigating, having lacked the time to check it out.

My first check will be the plugs, then wires, then back from there. If it gets too involved, it'll end up going to the dealer...

I'm completely open to suggestions and I'm begging for them from all you obsessed ones who may have had this problem before me.\

Thanks in advance,

Tom

[MrBill]

You are on the right track. Check the plugs first.

[Mr. Miyagi]

Your EFI? Are you using an oil base air filter like K&N? I was just at a Polaris dealer today in Elk Grove and there were about six or seven guys huddled around a phone on the hook with some Polaris engineer. A couple of guys were having problems with their 700 and 800's running bad. Some of the symptoms you just mentioned.... Feels like it's missing or shaking.

Apparently, Polaris is saying you can't run an oil base air filter with EFI.... Paper only. The oil is getting sucked into the carb. and the impact is like running a carbed Polaris with no filer. It starts to bog.... or shake, or..... feel like it's missing. Hope that helps.....

[MrPolaris]

I did not know that you cannot use a Oil based filter with the EFI. that is good to know. I am going to be hunting for a new filter here in the next couple weeks and will keep that in mind.

[Chadd]

I have seen latley that about 100 or so miles in DUSTY conditions with a K&N on a 700 OR 800 EFI, Your throttle body will be plugged with dust. paper stops all the dirt. I have been using a http://www.notoil.com and a friend of mine has been running a http://www.twinairusa.com/products/filters.html. I haven't had this problem since i switched to the foam filter. at $15 the paper filters get expensive at one a week.

[Ken]

That's really interesting about the K&N with EFI.....I guess it "sucks" harder.

[Chadd]

I guess it "sucks" harder.

Thats what i think. I've checked a few 500's and the carbs are clean with the K&N installed. the only think differant on my 700 is i put the 800 airbox snorkel on and It's definitly louder at WOT.

[DAVE]

thanks for the tip Chaddman...................will pick up for wifes EFI.

DAVE

[rangertom]

Heck yah!!! I've got a NOTOIL on there...since installing it, I put over 200 Miles on it, with no problems until now...and yeah...it shakes, spits and sputters...and like I previously mentioned, doesn't smell like it's burning all the gas...I'll check into it tomorrow or the next evening...That's really strange though...I mean, if you let the oil dry, it shouldn't suck any into the throttle body, right?

So, if this is in fact my problem, is there a cleanout procedure for clearing the injection system? It sure would be nice to know what I'm gonna need prior to starting this, possibly painful, maintenance.

Thanks again for the hot tip,

Tom

[Chadd]

turn the key on and off three times and leave it on the third time. This will go through a diagnosis and display any trouble codes in numberical order on the gauge. Let me know if you see a code. To clean the throttle body take off air box and throttle body, LEAVE the throttle cable hooked up, crank the throttle open and spray it out with carb cleaner. also clean the tube from the air box to throttle body it can get pretty dusty.

[rangertom]

Thanks for your help Chadd...will do...and will let you know...

[rangertom]

I opened the airbox...the filter looked quite dirty...removed it...the throttle body tube was perfectly clean...I installed a new factory paper filter...fired it up, and it ran perfectly! Go figure! It's just amazing how touchy the EFI system must be to having the perfect airflow. It sure was nice to see the throttle tube as immaculately clean...I wasn't looking forward to tearing that apart...

Thanks to all!

[rangertom]

turn the key on and off three times and leave it on the third time. This will go through a diagnosis and display any trouble codes in numberical order on the gauge. Let me know if you see a code. To clean the throttle body take off air box and throttle body, LEAVE the throttle cable hooked up, crank the throttle open and spray it out with carb cleaner. also clean the tube from the air box to throttle body it can get pretty dusty.

I did the diagnostic check...No codes came up...all checked out ok. Everything was in spec. I mean to tell you what...it's a BAD7 again! Runnin' like a raped ape!