Compression Ignition Addict
Join Date: Jan 2009
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when my turbo vanes stuck open i could get exactly 22psi max, truck only ran 80% good, couldnt really tell untill i towed my fifthwheel and it couldnt generate enough power to shift into 4th gear, then i knew something was wrong and started to troubleshoot. I normally get about 30psi with vanes working.... stuck vanes might be something to look at in your case. One thing i notice is when they were stuck open and i rev up engine in park it would generate no boost. when the vanes are working and i reve the engine up, the turbo makes some boost, like up to 8psi or so, might try that test on your two trucks and if they dont mactch , then possible stuck vanes.
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