Turbo Failure / Upgrade

[usmc363]

Did you check for DTC's? Do you have the P0299 DTC?
When you say you hear them spooling, what exactly do you hear? How are you getting your boost reading?

Yes, only the low boost code is there, and well the O2 sensors are new and the battery was reset so they haven't been driven enough. The turbos have the normal whine with RPM increase, The livewire TS+ shows .15psi on WOT and I had an inline boost gauge that wasn't moving either. I disconnected the inline boost gauge though just to make sure it was leaking or anything.
I updated firmware on the tuner and then got a datalog. The wastegates show going to 100% when I hit the gas.

 

[usmc363]

Just went for another datalog, seems like there might be a low toned whistle as well as the regular turbo whine. Possibly an intake leak? IDK FML. Why does the manifold pressure show 14psi but no boost? Am I reading this wrong?

 

[toms89]

I believe manifold absolute pressure would be atmosphere pressure + boost. So atmospheric pressure is somewhere near 14.7 psi at sea level. Weather also factors in but should be close. That may explain the discrepancy.

Make sure to clear the DTC and reset the KAM as you proceed with testing. Once it's set it's possible the pcm will remain in "limp home" mode and intentionally limit boost. Mine did this when I was datalogging and tripped the low boost DTC.

The wastegates show going to 100% when I hit the gas - Confirm that this is correct. The pcm "turns off" the wastegates to build boost. I found the term wastegate duty cycle a little confusing on how it is implemented. Seems backwards.. As I now understand it 100% WDC means the pcm has effectively cut off the boost reference line to the wastegates, 100% of the time of course, so the pcm has control of the boost. 0%WDC means the wastegates have full boost reference and will open at whatever boost the wastegate is physically set at. When at 0% you are running "on the wastegate". I believe its in the neighborhood of 6 to 8 psi factory.

 

[usmc363]

Is there an indicator to show when the PCM is in "limp mode". I'm not having limited boost, I'm having no boost. ~(.21psi) at WOT. Looks like I'm going to have to bite the bullet and take it in.

 

[usmc363]

Scheduled to take it on for a smoke test in a couple weeks. Hopefully find where all the boost is going.

 

[usmc363]

Is the hose from the boost solenoid to charge pipe connection complete?

Yes sir.

 

[usmc363]

Ok, so the shop had it for two weeks. They cannot find any leaks. They said the turbos must be bad, wrong, or something is going on with them. They tried several tests and bypasses to get the boost to build and nothing. This is awesome. About to drive it off a cliff.

 

[usmc363]

Contacted CR Performance and they said to try disconnecting the linkage on the wastegate actuator to force the valve to stay closed and build boost. That is the only other possible route it could be going. Will test and advise.

 

[01svtL]

Contacted CR Performance and they said to try disconnecting the linkage on the wastegate actuator to force the valve to stay closed and build boost. That is the only other possible route it could be going. Will test and advise.

Any updates?

 

[usmc363]

Just got it back from the shop, they found no leaks, and were unable to identify the issue. I am going to disconnect the WG rods completely and see if it will builds any boost so we can rule out everything but the turbos this weekend....or set the whole car on fire. 50/50. lol

 

[luigisho]

....or set the whole car on fire. 50/50. lol

You are officially a veteran SHO owner. Good luck!!

 

[RandR10]

I had a similar problem after a transmissions swap. Turned out that the boost reference hose was unhooked from the boost solenoid. It would make boost momentarily then when it hit a certain boost level it would lock the wastegates open until it was shut off and restarted. Took me a while to find it.

 

[usmc363]

I had a similar problem after a transmissions swap. Turned out that the boost reference hose was unhooked from the boost solenoid. It would make boost momentarily then when it hit a certain boost level it would lock the wastegates open until it was shut off and restarted. Took me a while to find it.

Ugh I literally wish it was that easy at this point. lol.

 

[usmc363]

Ok, pulling turbos back out. Stay tuned.

 

[kryptto]

Ok, pulling turbos back out. Stay tuned.

Sorry to hear your issues, I like this guy's video for making an inexpensive leak tester.

3" pvc and compressor connector, 20 psi

 

[usmc363]

Tried putting on new BOV's, still no boost.
Pulled front turbo out, seems fine.

@kryptto I did try that months ago with 20psi. The intercooler and charge pipes help the pressure, no leaks. Also tested the intercooler to TB pipe and it had a very slight leak (not enough to lose all boost) but I replaced it with the aluminum piping from Ecopowerparts. No leaks.

 

[BradM]

Did you try flashing back to the stock tune? Did you check (or just block off) the PCV valve?

 

[BradM]

Stock tune and put the OEM MAP sensor back in?

 

[usmc363]

@BradM Flashed it back to stock when I brought it to Ford a couple weeks ago, apparently it has the 2.5 bar MAP in it already (Mistakenly thought I had the 3 bar from previous owner statements..) but Ford said it was throwing a MAP sensor code when they first got it and put a new one on it but the code persisted. They then refused to work on it anymore due to "aftermarket" parts on it. I got it back, put the original MAP sensor back in, loaded the tune back in it and the MAP sensor code cleared. I replaced the PCV valve with a new one when I replaced the water pump / timing chains (about 2 months before the turbo's **** the bed). I haven't checked it since the original turbos let go.....

 

[kryptto]

They then refused to work on it anymore due to "aftermarket" parts on it

They checked the computers flash count...