Dodge Repair Questions? Ask a Mechanic for Answers ASAP
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Have you checked the intake system and Turbo Resonator for intake boost pressure leaks?
Basically if there is a leak, you will find oil vapor spray near the leakage point. On the intercooler hoses, just check carefully for splits or tears. The turbo resonator is at the turbocharger outlet., If this is bad, you will see oil spray on the hose that runs in front of the resonator. You will also hear an air rushing escaping sound under hard acceleration before the turbo stops boosting and goes into limp mode...
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To test for leaks you can have a helper "Power Brake" the engine in reverse while you listen to the intake air system for leaks. You will normally hear a loud air rushing sound coming from the source of the leak...
Just pull the intake hose from the air cleaner housing off the front of the turbocharger and look inside. If the turbo compressor wheel is damaged or "Sand Blasted" then the turbo will need to be replaced...
Here is a pic of a Turbocharger that ingested sand and notice the blades are rounded off and sandblasted..
--->> Click Here to view <<---
If yours looks similar to this, the turbo will need to be replaced....
If you are getting turbo boost until it goes into limp mode then the turbo is definitely working... If you are certain that there are no leaks present, then I would go ahead and replace the Boost Pressure Sensor (MAP sensor) and possibly the Mass Airflow Sensor.
I'm posting a pic that shows the location of the Boost Pressure sensor (aka MAP Sensor). The MAF (Mass Air Flow) sensor is mounted to the Air Filter housing and the turbo inlet hose is attached to the MAF sensor.
Here is the Boost pressure sensor Location:
Here is a pic of the MAF sensor: