lookforjoe Posted January 22, 2013 Report Share Posted January 22, 2013 A lot of the WMI kits, entry level single stage kits as well as progressive kits, don't use a control solenoid at all. The controller simply turns the pump on and off (progressive kits run at a predetermined duty cycle). In a perfect world the flow would stop as soon as the t-body snaps shut, but the pump is spinning and doesn't stop immediately and the pressure in the line is bled through the nozzle, so some fluid is injected behind the closed throttle plate. It's not a lot of fluid at all and yes that fluid will run down and lay at the lowest point. Adding a solenoid to the WMI system would help minimize the problem, but a very small hole drilled in the IC solved the issue for me. I see, that makes sense then. My solenoid is less than 6 inches from the nozzle, when it shuts, there is so little fluid in the line, I don't have a dribbling problem. Cheaper to drill a bleed hole than add the $100 solenoid. Link to comment Share on other sites More sharing options...
98t5M Posted January 24, 2013 Report Share Posted January 24, 2013 You could also drill the hole, tap it with an NPT Tap and use an allen head NPT plug with teflon tape for extra tight seal and cool factor. Link to comment Share on other sites More sharing options...
Gideon35T Posted January 24, 2013 Report Share Posted January 24, 2013 I've never seen enough build up to be concerned. Just pull the intercooler every few years and rinse with some gas, mineral spirits, or similar. Link to comment Share on other sites More sharing options...
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