dnevins
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• Subscriber since 12/29/2009 |
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• San Diego, CA, USA |
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• Registered on 12/28/2009 |
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• 340 posts |
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Replacing the EGR valve will not touch P0299, because that code is about the turbo not making the boost the computer asks for, and on the 6.0 there are four usual reasons:
1. A boost leak. Check every intercooler boot and clamp between the turbo and the intake for oil residue, splits or a loose clamp. A small leak is enough to set it. Pressurize the intake side and listen if you cannot see it.
2. Sticking turbo vanes. The 6.0 turbo has variable vanes that gum up with soot and rust, especially on trucks that see short trips. A sticking vane ring can often be freed and cleaned without replacing the turbo.
3. The turbo's control solenoid, which moves those vanes. If it does not respond, a healthy turbo will still underboost.
4. A plugged exhaust back pressure (EBP) sensor tube. The computer uses exhaust back pressure to run the vanes, and that small tube cokes shut on 6.0s all the time. Pull the sensor, clean it, and blow the tube clear from the sensor end.
A scan tool that shows commanded versus actual boost and the turbo vane position is the fastest way to tell these apart.
Dana
https://partslogic.com |
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Posted:3/25/2011 15:22