I've got an 09 arctic cat mudpro with EFI. Any idea why the idle is funny? Sometimes it idles good, then sometimes it can't even idle so it stalls, and sometimes it has trouble starting. I think if the ECU got wet it wouldn't start at all, maybe the injectors?? Thanks

 

The problem with efi on a ATV is that you have a bunch of vulnerable sensors that might get wacked. I think the best thing might be to take it to a dealer to scan for codes, unless you have a way to yourself. I can always figure the problem on my Dodge hemis, because I have Diablo tuners. I try not to drive them where I take my AC's though. First thing, might change spark plug, though.