rt2439

have a 2012 f150 with the 3.5 eco boost engine... having a wooshing sound upon acceleration but with no loss of power at all.. had it at a Ford mechanic for 3 weeks and he could not figure out the issue.. it will run and accelerate sometimes with no noise or loss of power....

any help would be appreciated!

gDMJoe

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dsg2003mach1

i would want something hooked up to see boost pressure - maybe something is leaking only above X psi, if it does leak I'd think you should see at least a momentary drop in boost pressure. Im sure there are parameters to set an underboost code (has to be so much under commanded boost for a given length of time and may need to occur a certain number of times within a given number of drive cycles).

rt2439

I did not put the code that i am getting, it is P0234 which is Over boost Detected....

dsg2003mach1

ah, well overboost is certainly a different ball of wax. I see a few references to that being turbo A but as far as I know the map sensors are in joint piping so don't how a map sensor could narrow down which turbo it is.

I dont know what, if any, sensors are in the waste gates on the turbo themselves

0234 code definition

Engine Overboost ConditionWhat the P0234 code means

P0234 is a generic OBD-II code that is triggered when the Engine Control Module (ECM) detects that the intake boost pressure sensor input signals intake pressure above the maximum specified pressure by 4 psi for more than 5 seconds.What causes the P0234 code?

• The turbocharger/supercharger wastegate is damaged or sticking
• The wastegate control valve solenoid is sticking
• The wastegate control hose is getting blocked and the boost pressure cannot be relieved quickly enough

What are the symptoms of the P0234 code?

• The Check Engine Light will be illuminated and the P0234 code will be set in ECM memory.
• The engine overboost condition may cause gaskets or seals to the intake or heads to fail.
• The engine may run normally until the excessive overboost pressure blows out a gasket or seal.

How does a mechanic diagnose the P0234 code?

• Scans codes and documents the freeze frame data in order to verify the problem
• Clears the codes to verify whether the concern comes back
• Checks the operation of the boost pressure solenoid for proper operation of the wastegate
• Checks the wastegate for sticking or binding
• Check the wastegate relief hose for kinks, blockage or damages

Common mistakes when diagnosing the P0234 code

Follow these simple guidelines to prevent misdiagnosis:

• Check the boost pressure sensor hose for obstructions or kinks
• Verify that the overboost pressure condition is not from boost pressure sensor incorrect input voltage

How serious is the P0234 code?

• The boost pressure in the intake can give you a lot of power, but an overboost condition when the engine is not designed to handle it may cause catastrophic engine failure, like a blown engine or blown head gaskets.

What repairs can fix the P0234 code?

• Replacing the boost sensor if it is not giving the correct input pressure reading to the ECM
• Replacing the wastegate control solenoid if it is sticking
• Replacing the wastegate valve if it is sticking or binding
• Repairing or replacing wastegate hoses due to kinks or blockage of the wastegate lines