Compression Ignition Addict
Join Date: Jun 2010
Location: Carlyle, IL
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yeah, definately sounds like a boost leak, fun part is determining if its on the exhaust side or the intake side.
Check all of your intercooler boots, check both plenium boots. When mine leaked it was at the pleniums, but mines an e99 so its an issue. If they are greasy and all I'd go ahead and take em all off and wash them, do the ccv mod, then re-install them. A little hairspray can help them seat better during reinstallation (which is a pita at some points). This is how you'd check the intake side.
For the exhaust side, get a small angular mirror (like they use at the dentist office) to check for soot on your uppipes. If there is soot on your firewall you can almost garuntee its an exhaust side leak. Unfortunately if its leaking here its more of a pita all together, because you need to do uppipe gaskets, or switch to international bellowed uppipes. the bellowed uppipes solve the problem permanently (barring catastrophic failure) but are expensive, the gaskets are cheaper but have to be done ever so often.
BUT before doing both of these, how are you reading your boost? Is it thru a seperate gauge or is it electronically through the map sensor? If its thru a seperate gauge, I'd say for sure a boost leak. If its electronically thru the map sensor, I'd say it could be bad/blocked.
First rig: e99 F250 CCSB 4x4 auto, white, 388k miles: traded in
Then: 02 F350 RCLB SRW 4x4 zf6, silver, 201k miles, THREW A ROD
: traded to Jake
Now: 96 F350 CCLB DRW 4x2 auto, red and silver/grey, 266k miles: rusty but trusty