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trx intermitent fuel or electrical problem ?

B

boosted metal

Member
04 trx rods,pistons, updated alpine header,heavysprings,head bolts,trying to trouble shoot a intermitent problem only under load,sled runs great in the shop , but under load and 5 mins into riding it pops,sputters,backfires,drops to running on 2-3 cylinders, shut it of and sits 10 mins and runs great then cuts back into the poor running,when it cuts into this, its hard to build rpm from idle and air/fuel reads real lean all at idle, if you apply choke full on it doesnt kill the motor? i have checked fuel pressure and at idle 6 pds fuel pressure, checked the header for cracks and none ,header flange to turbo flange is tight,all electrical is dry and no open wires in nose of sled,going to check the tors at the carb, but not sure what spec is for resistance or if it can be bypassed?i always thought when a coil fails its done not intermittent, same with fuel pumps ?not sure on what else it can be? i cant get the sled to act up in the shop on a lift.anyone else ever have this problem :confused:
 
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