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Apex with 290 mcx aux injectors firing at idle problem

Octanee

Well-known member
Lifetime Membership
Nov 15, 2010
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Cranbrook Bc
Hi guys so I picked up a 06 or 07 yamaha apex with the mcx 290 kit that has auto altitude compensation. The previous owner said if you left the injectors for the cooler plugged in it wouldn't run. I just got a new battery in it and what's happening is the auxiliary injectors in the intercollegiate are indeed firing at idle and causing the sled to basically flood it's self.

I unhooked the vacuum hose to the mcx brain box and that never changed anything. If I hook up shop air to it for pressure it keeps the injectors on constantly as it's supposed to in boost. I'm not too sure where to go from here, when I first turn on the key the boost controller also seems to be "chattering" whether that's nornal or not.
 
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