Join Date: Dec 2009
Location: Sac, Ca.
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Can't find boost leak!
Getting my new to me 2000 f250 w/ 145k miles on 7.3 on the road. The truck is bone stock. I found a rip in an intercooler boot and replaced that, and sealed up a couple other small intercooler line leaks. I could then hear the turbo kicking in and feel more power. That lasted for a couple days, then it seemed to be losing power again.
I made a boost leak detector that fits in the intake tube in place of the large plastic connetor (1/2 between the airbox and the turbo). I left the little green pressure hose in place and put a plug on the pcv hose from the valve cover.
I pressure up to 10-15 psi and can definately hear a leak - I'm pretty sure it's on the passenger side, back by the turbo somewhere. I spent over an hour with a soap spray bottle, climbing all over the engine and can't track down the leak. I sprayed and felt around the downpipes - no black soot and no air leaking out. I checked all the intercooler boots again and again - they don't seem to be leaking. The turbo wheel spun freely and didn't seem to be damaged or have any excessive play.
Any ideas of where else to look? Should I be plugging intercooler pipes or something, to stop the air pressure from going into the engine via the valves, to really get a good pressure check? If so, how/where would I accomplish this.
Thanks for the input!
Last edited by hpcbmw; 02-05-2010 at 07:14 PM.