Sometimes I loose boost completly, without check engine light. Restarting the car fixes the issue.

[Peteros]

Hi,
I have issue with my 2014 Fiesta ST. After couple minutes (like 5-10 minutes) of hard driving (I mean many repetitive pulls), boost can shut down almost completly. It happened in 3rd, 4th, and 5th gear, always while floring it. I have oil temp gauge, and when it happenes, it isn't anywhere near being too hot. Stock coolant temp gauge is also showing normal temps. Car doesn't throw any check engine light, nor wrench light. Boost doesn't come back, until I shut down the engine, and after turning it back on, car has full power.
It's quite annoying, because I want to go on race track, and I can't do it if the car looses power after couple minutes of fast driving. When I drive normally to work, with only couple pulls to redline when I have free space on road, car runs totaly fine.

I bought code reader, and it throws P132B, which is 'Turbocharger boost control "A" performance'. Forscan suggests me that amplitude of signal is lower than minimum. So I guess that means that car is not getting enough boost?


I made two graphs with boost pressure to redline: https://i.imgur.com/EsrYTpf.png https://i.imgur.com/xBoXKqv.png , and I think that something is wrong. After 5000 RPM boost pressure drop significantly. After this tests, I tightened every hose, and connector with boost pressure I could find. Most of them were quite tight, hovewer Forge BOV adapter went quite loose. I thought it fixed the issue, but on graph there is no improvement in boost pressure: https://i.imgur.com/LYnhJuH.png

Do you guys have boost drop after 5k RPM? Maybe it's normal?

Do you have any ideas how can I resolve my problem?



About my car:
It's slightly modded. Things that are changed:
- Airtec Intercooler
- Forge inlet hose (with fully stock intake box)
- Forge BOV Adapter
- Magnaflow exhaust
- Tune similar to ST200 (200 hp with 217 hp overboost)

 

[A7xogg]

stock turbo looses boost after 5k, but i would take off that adapter, reset the ecu and see if the code comes back

 

[Peteros]

[MENTION=5213]A7xogg[/MENTION] Are you sure, that loss should be so big? It's huge drop in boost pressure.

Could you maybe do similar graph?

 

[A7xogg]

[MENTION=5213]A7xogg[/MENTION] Are you sure, that loss should be so big? It's huge drop in boost pressure.

Could you maybe do similar graph?

https://datazap.me/u/a7xogg/wastegate?log=0&data=4-8-25

Mine is smoother but see how it looses boost as the rpm goes up. Can you log the wgdc along with boost? Car looks like its cranked on the boost then falls sharply so i would like to see the wastegate duty cycle before i say any more

 

[Peteros]

I don't think I have option to monitor wgdc in my app. What kind of app or datalogger do you use to get it? Here are all of the things I can monitor in my app: https://imgur.com/a/1Rph6ab


Btw. I have Euro spec car.

 

[LaserWhisperer]

+1 for WGDC

 

[Peteros]

[MENTION=4809]LaserWhisperer[/MENTION] [MENTION=5213]A7xogg[/MENTION] How can I get this reading. All I can monitor in my app is: https://imgur.com/a/1Rph6ab

 

[A7xogg]

[MENTION=4809]LaserWhisperer[/MENTION] [MENTION=5213]A7xogg[/MENTION] How can I get this reading. All I can monitor in my app is: https://imgur.com/a/1Rph6ab

What tune are you running? A oem tune? Check ur dv too

 

[A7xogg]

Idk what app that is but check anything that says wastegate actuator percentage or something like that and throttle % actual and command

 

[Peteros]

[MENTION=5213]A7xogg[/MENTION] Sorry for long response time. My tune is custom, made for my car. It was made by guy, who is really well known for tuning fords in my country, so it shouldn't be causing issues.

By checking dv, you mean this factory part, that I have on my blowoff adapter? What can I check in it?

And for this wastegate actuator, I don't think I have sensor for it. My car is euro spec, so maybe it's only in US spec cars?

 

[A7xogg]

[MENTION=5213]A7xogg[/MENTION] Sorry for long response time. My tune is custom, made for my car. It was made by guy, who is really well known for tuning fords in my country, so it shouldn't be causing issues.

By checking dv, you mean this factory part, that I have on my blowoff adapter? What can I check in it?

And for this wastegate actuator, I don't think I have sensor for it. My car is euro spec, so maybe it's only in US spec cars?

Yes, you can check for tears in the dv and adapter, or a do smoke test. The wgdc controls how much boost you have cause the wastegate spring is only 5psi and the wgdc just tries to trick the wastegate into seeing less boost than your making to make more boost. .

 

[tunedsociety]

Having a similar issue. Did you ever get this resolved?

 

[Yoann01ST]

I had the same issue this summer. However, for the last few weeks, the weather has been cooler and i don't have this issue anymore. Maybe something to do with hot exterior temperature ? I'll see if it comes back...

 

[TyphoonFiST]

I had the same issue this summer. However, for the last few weeks, the weather has been cooler and i don't have this issue anymore. Maybe something to do with hot exterior temperature ? I'll see if it comes back...

Heat soak* Time for an upgraded radiator and Intercooler if your still on stock poop.

 

[dhminer]

Heat soak* Time for an upgraded radiator and Intercooler if your still on stock poop.

He called the shit poop!

 

[TyphoonFiST]

He called the shit poop!