I've rebuilt injectors in the past and never had a problem but this time out of 8 injectors I have 4 injector housings I can't get right. They are for my 240d. The ones I'm having problems with pop and spray perfect when I pump the handle of the tester steady but if I pump real slow they squirt before popping. When I say squirt it's a steady stream of fuel. I've rebuilt them with new Bosch (India) and new Bosio nozzles and the problem follows these 4 injector housings. Any suggestions? The other 4 even when I pump the handle real slow pop perfect at the correct PSI I have them set to. Should I even worry about this, it may not even be a problem. I lapped them a couple times and cleaned the housing multiple times including boiling them in soapy water and soaking them in acetone.