Low Boost-VGT? - Ford Powerstroke Diesel Forum
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Old 01-09-2013, 03:34 PM
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Low Boost-VGT?

Bought this truck about two months ago, had to replace batteries. This helped my start problems. Now about a month later My boost wont climb above 7. I replaced my intercooler(it was in fact bad) but no help on the boost. Changed my fuel filters this morning, no help. My edge evolution was throwing a PO206 code for a while then went away. I assume it was trapped air. All my boots are good and my buddy at the truck shop down the road did a leack down test on the entire intercooler system and said it was fine. I'm not sure what to check next. VGT? Down pipe?
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Old 01-09-2013, 04:06 PM
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These garrett turbos are made out of cast iron so they rust. The vanes get hung up on the rust build up affecting their ability to move and build boost. Cheapest thing to do before cleaning the turbo, imo, is to do some wot runs from a dead stop and clean the egr valve. Could help.

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Old 01-09-2013, 04:15 PM
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Cleaned The EGR Saturday Did 4 WOT runs after filter change this morning, 0-70 or so. New to the Deisel truck stuff, hoping I didn't buy the wrong truck!
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Old 01-09-2013, 04:25 PM
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No its normal for the turbo to get coked up.

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Old 01-09-2013, 04:35 PM
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I guess the turbo comes out this weekend! At least I can say I know alot more about TDPS motors than I did 2 months ago. I have to admit, I love this truck!
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Old 01-09-2013, 06:16 PM
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Boost issues can also be because of exhaust leaks. Not enough exhaust gas reaching the turbo.
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Old 01-09-2013, 09:04 PM
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-map sensor or tube
-ebp sensor or tube
-vgt solenoid
could be any one of those as well. try this, engine idling, cold, disconnect the vgt solenoid connector. you should hear a definite change in idle disconnected and connected. you can also apply 12v and ground to the solenoid to actuate it. connect. disconnect. listen to the idle. if you hear a change, the vgt is probably not sticking. if you don't hear a change it's either the vgt solenoid is bad/stuck, or the turbo vanes are stuck
also, remove your ebp sensor and have a look at the sensor inlet and tube. if it's plugged with carbon, that could be your issue right there. what i like to do is fire it up with the sensor out. the exhaust will usually blow the carbon out the tube. if it doesn't replace the tube and sensor.
check your map sensor hose for holes and/or carbon build up inside.
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Old 01-10-2013, 03:26 AM
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When I start mine in the morning it takes about 30 sec and then I can hear the turbo wind up and the exhaust sound changes. Is this normal or does that mean something is not working properly? It has done this since the turbo was redone and before the EGR delete. If I start to move before the exhaust note changes it throws a underboost code. The shaft is free of play and turns easily.
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Old 01-10-2013, 05:16 AM
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^^is it an early 04?
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Old 01-10-2013, 05:39 AM
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No. Late 04.Turbo was done at dealer in May. New unison ring. I did EGR delete in Oct. No exhaust leaks and boots are tight.
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