make sure that both the upper and lower contact wetting waters are flowing.
also i would remove both upper and lower injection chambers and service them.
while the chambers are removed switch contact on/off and check for proper water.
do this also with the threading jet. ensure all orifices in upper head are clear.
check distributor block, cutting block, rethread block and contact block for proper
water and air flow thru the blocks.
my guess is that you are missing contact wetting water.
good luck,
mdynac
Registered Linux User #348337
EMC2 Rocks!!!!