Acert boost

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I have a 2005 cat acert my boost gauge goes up to about 40 psi then drops rapidly down to about 35. No power loss.????
 

Rigjockey

In Gord we trust!
Supporter
I have a 2005 cat acert my boost gauge goes up to about 40 psi then drops rapidly down to about 35. No power loss.????
I am guessing an actuator valve. I am no mechanic but on the new acert circa Odd6 it was the actuator.
 

r3gulator3

IMA KEEP IT REDNECK
Supporter
I would guess one of three things. If you have a waste gate it could be weak and creating your small boost loss. Two, if it's a variable turbo could be the actuator or stuck fin. Three. Weak spring clap on a CAC boot blows open a leak at 40 then will maintain 35 psi but that would usually be accompanied by a squeal that sounds like a constantly slipping belt. Most likely am 05 will have a dual turbo set up that is waste gated and the waste gate is probably weak. Hope that helps.
 
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