Turbo Over boost Condition

[jag8723]

I was driving my car ('13 sho pp, k&n intake, livernois 93 octane tune, and corsa catback) and I floored it at 70mph, rpms stayed at around 5k and barely accelerated. Tune showed code p0234 (turbo overboost condition). Took the tune out and same thing. Intake is tight and I even took it to the dealer who couldn't figure it out. What can possibly be causing this?? Seems to drive normal and accelerates fine up until 65-70.

 

[EcoPowerParts]

What amount of boost are you seeing?
I'd try disconnecting the battery and letting it reset and then trying again.

 

[jag8723]

I'm not sure I don't have a boost gauge or any way of checking. I'll try disconnecting the battery tomorrow and see what happens. Just so weird that all of a sudden it started doing this.

 

[EcoPowerParts]

Get one of these:
http://www.ebay.com/itm/ELM327-V1-5...391?pt=LH_DefaultDomain_0&hash=item5aefa66df7

Install Torque Pro on your android device (hopefully you have one)
And watch boost, it almost sounds like you have a massive boost leak or bad turbos.

 

[jag8723]

I do have an android and I just ordered one! Will definitely update with details when I know more. Thanks for the advice.

 

[Sleeper4SHO]

Get one of these:
http://www.ebay.com/itm/ELM327-V1-5...391?pt=LH_DefaultDomain_0&hash=item5aefa66df7

Install Torque Pro on your android device (hopefully you have one)
And watch boost, it almost sounds like you have a massive boost leak or bad turbos.

Just got the sct livewire ts...will this read the codes same as Torque Pro or is it helpful to have both?

 

[SHOdded]

Check all the clamps on your turbo piping. Fairly common to have leaks there due to loose clamps. Rarely, the pipes may split (ask 4DR about that ), but not likely in your case (not making the prodigious amounts of power 4DR did).

 

[SHOrod]

I need someone to educate me. Why would leaks in the intake tubing lead to an overboost diagnostic code? It seems like a leak would be underboost?

-Rod

 

[SHOdded]

From my understanding, loose piping leading to the wastegate actuator creates a false low reading by the actuator, which then does not open, and leads to an overboost condition/code. Of course, the wastegate itself could be stuck.

http://www.aa1car.com/library/turbo_repair.htm

A leaky turbo MIGHT be blamed for wastegate failure also, if the oil is gumming up the works.

 

[SHOrod]

From my understanding, loose piping leading to the wastegate actuator creates a false low reading by the actuator, which then does not open, and leads to an overboost condition/code.

Okay, that makes sense. It dawned on me this morning that I have the FSM, I can look up possible causes for the code in our cars.... I will do that this weekend.

-Rod

 

[EcoPowerParts]

Just got the sct livewire ts...will this read the codes same as Torque Pro or is it helpful to have both?

You can monitor the car just like torque pro but a lot of the things you want to monitor aren't included by default so you have to go through a process with the PC program Live LInk to make a config to download to the Livewire to make it monitor those items.

Torque Pro is much much easier.

 

[yamahaSHO]

Boost leak test the intake tract with an air compressor to quickly find leaks.

 

[EcoPowerParts]

Sounds easy, doesn't it?
NOT EASY, you have to cap the inlet to the rear turbo or put in a whole new section of pipe. I tried over and over to try and figure a way to do this but couldn't get it done.
If it was a 4 cyl turbo, easy peasy, not so much on this car.

 

[jag8723]

Once that obd2 diagnostic scanner comes in I'll have a better idea. You would think when I took it to the dealer they would have checked for something loose.



That o ring was broken on diverter valve (I'm assuming that is what it is) which they replaced that and the whole tube. But looks like something else is the issue.

 

[yamahaSHO]

Sounds easy, doesn't it?
NOT EASY, you have to cap the inlet to the rear turbo or put in a whole new section of pipe. I tried over and over to try and figure a way to do this but couldn't get it done.
If it was a 4 cyl turbo, easy peasy, not so much on this car.

If there is a single point of entry, use that and low boost. If there is one throttle body, use that.

 

[SHOrod]

From the factory service manual:
P0234 - Turbocharger/Supercharger A Overboost Condition
Description: The powertrain control module (PCM) continuously monitors the turbocharger system for an overboost condition. The PCM checks for a maximum throttle intake pressure (TIP) PID reading during engine operation, which indicates an overboost condition. This DTC sets when the PCM detects that the actual throttle intake pressure is greater than the desired throttle intake pressure by 27.6 kPa (4 psi) or more for 5 seconds.
Possible Causes: Damaged turbocharger (TC) wastegate regulating valve solenoid
Damaged wastegate adjusting rod
TC wastegate regulating solenoid valve stuck
Wastegate stuck closed
Wastegate control hose open or plugged
Incorrect wastegate adjustment
Diagnostic Aids: Check tubing for obstructions, cracks and incorrect fitting connections.
Check the turbocharger wastegate regulating valve solenoid for correct operation.

-Rod