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Boost bleed only under load
A good friend of mine is getting frustrated with his 2005 F450 6.0L. I volunteered to give him a hand and look into the problem. This is my first post so my apologies if I come across as a complete newbie.
I did a fair amount of research on this site but was unable to find anyone with my exact problem. Here goes..
The truck runs excellent 99% of the time and has had regular maintenance. It is completely stock with 105K miles. The turbo vanes were cleaned about 6mo ago. Max boost has always been about 22psi. About a month ago when under a heavy load the boost will audibly bleed off and drop to around 15psi. You can hear the air rushing out. The strange part is that you can accelerate to 22psi while NOT under a load and the boost bleed will not occur. I plan on checking the CAC and all hoses. After that I don't have a clue.
Does this issue sound familiar to anyone? Could it be a VGT solenoid?
Thanks for any advice.
Last edited by jgkurz; 09-23-2013 at 09:31 PM.