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Old 05-30-2013, 10:01 PM

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What should the numbers be?

This is a multiple part question for the clueless (me). My rig has been the only 03 with a full straight from turbo back around my town. You can guess it was known when I would be on the go. I have been asked by so many people lately why I put a muffler on my truck. The problem is I didn't? I used my scan tool, and no codes. I put it in the live screen setting. I can view MAF, IAC, MAP, etc. but have no idea what the parameters should be. I could be a lawyer after all the reading I've been doing on this subject of why the whistle isn't happening. I can hear air moving, but not nearly like it use to. I am assuming maybe a dirty turbo? I watch my Edge monitor closely, but with the slow increase in the issue I guess it got past me. I noticed that my boost alarm would come on when I got on her hard. Now I can push it to the floor and not get over 23ish.. Idk when that started occuring and that is sad. I dont want my truck sick, and she use to sing so pretty to me. Who wants to solve this world problem?
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Old 05-30-2013, 10:08 PM


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Sounds like either a boost leak, stuck/sticking vanes/unison ring, possible bad/failing vgt solenoid, exhaust leak pre-turbo, clogged ebp tube/bad sensor. I would start by checking the easy things first.

Easiest is exhaust leak pre-turbo. Put the truck in gear and power brake it with the hood open. If you see smoke coming from the engine bay that is your issue or at least part of it.

If that checks out start checking for boost leaks. Check boots, clamps, tubes and CAC for cracks holes or leaks.

Next pull the EBP sensor and tube and clean them up real good then test again.

Last would be pull the turbo and pull it apart to check the health/give it a cleaning on the exhaust side and see if that does the trick. If not then check the vgt solenoid by swapping with a known good one.

Also might want to pull the MAP hose and check for cracks, holes, tears etc. and clean the fitting out that the hose goes onto in the manifold and clean the IAT sensor in the manifold as well.
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Old 05-31-2013, 07:29 AM
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Broke whistle...

Usually you hear it the loudest at low rpm building boost. So you are not building boost as quickly.

Idle = slight whistle, almost 0 boost, EBP 15-17psi
Higher idle and light acceleration = moderate whistle, 1-2 psi boost, EBP 17-22psi
Normal acceleration = strong whistle, 3-10psi boost and EBP >25psi
Harder acceleration and the exhaust note drowns out the whistle.

As Bryan said, look for a leak in the exhaust side (up-pipes), since that is what drives the turbine and whistle. Barring that, look at the VGT vanes position and EBP. Next step is to clean the turbo and ensure the unison ring and vanes move freely.
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