2012 fx4 boost cycling

885 Views 55 Replies 7 Participants Last post by snakebitten, 2 d ago

rramsey13

Discussion Starter · 18 d ago

my 2012 fx4 is cycling boost on factory tune 15psi-7psi over and over around like 1/2 to 3/4 throttle. I put a 5star tune on it i also get the same thing but with pressures being 20-13 over and over. I have done new plugs, coils, timing, factory turbos, exhaust manifolds, all sensors. I checked for leaks and see none. It does not throw a code at all, It is getting quite annoying trying to figure out. i even drilled the 1/16 hole for condensation. I also have been reading form after form checking all and double checking with no solution. i am just at a loss and am about at witts end. I am hoping someone else has had this issue and has figured it out.

1 - 20 of 56 Posts

snydmax

· #2 · 18 d ago

Waste gate solenoid?

rramsey13

Discussion Starter · #3 · 18 d ago

snydmax said:
Waste gate solenoid?

Replaced them also

snydmax

· #4 · 18 d ago

The “spider” assembly that includes the waste gate solenoid has a whole bunch of vacuum lines that could have a leak

snydmax

· #5 · 18 d ago

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Reactions: 1

rramsey13

Discussion Starter · #6 · 18 d ago

snydmax said:
The “spider” assembly that includes the waste gate solenoid has a whole bunch of vacuum lines that could have a leak

Wouldn’t that be seen on the boost gauge though my vacuum shows anywhere from -5 to-10 at idle and everything I read shows that’s right

snydmax

· #7 · 18 d ago

Are you able to watch vacuum as your boost cycles? Curious if there is any correlation in the readings

rramsey13

Discussion Starter · #8 · 18 d ago

snydmax said:
Are you able to watch vacuum as your boost cycles? Curious if there is any correlation in the readings

I can do another datalog and post it

rramsey13

Discussion Starter · #9 · 18 d ago

snydmax said:
Are you able to watch vacuum as your boost cycles? Curious if there is any correlation in the readings

Any certain pids you want

Blown F-150

· #10 · 18 d ago

This issue is usually tied to the PCM not being able to target the right boost level to match the torque demand. Given the age, I would 100% recommend starting with some new WG Actuators, if you don't find any damaged or cut lines running to the WG's or running to and from the WG solenoid mentioned above. The Diaphragms in the WG's fail over time.

www.full-race.com

2011-2016 F150 EcoBoost 3.5L Gen 1 Wastegate Actuator

2011-2016 F150 EcoBoost 3.5L Gen 1 Wastegate Actuator Replacement

www.full-race.com

They show out of stock, but you may be able to go to the TurboSmart version. Keep the springs to 3.5 -5psi.

rramsey13

Discussion Starter · #11 · 18 d ago

Blown F-150 said:
This issue is usually tied to the PCM not being able to target the right boost level to match the torque demand. Given the age, I would 100% recommend starting with some new WG Actuators, if you don't find any damaged or cut lines running to the WG's or running to and from the WG solenoid mentioned above. The Diaphragms in the WG's fail over time.

2011-2016 F150 EcoBoost 3.5L Gen 1 Wastegate Actuator

2011-2016 F150 EcoBoost 3.5L Gen 1 Wastegate Actuator Replacement

www.full-race.com

They show out of stock, but you may be able to go to the TurboSmart version. Keep the springs to 3.5 -5psi.

The turbos came with new wg and bov and I replaced all the solenoid

rramsey13

Discussion Starter · #12 · 18 d ago

Blown F-150 said:
This issue is usually tied to the PCM not being able to target the right boost level to match the torque demand. Given the age, I would 100% recommend starting with some new WG Actuators, if you don't find any damaged or cut lines running to the WG's or running to and from the WG solenoid mentioned above. The Diaphragms in the WG's fail over time.

2011-2016 F150 EcoBoost 3.5L Gen 1 Wastegate Actuator

2011-2016 F150 EcoBoost 3.5L Gen 1 Wastegate Actuator Replacement

www.full-race.com

They show out of stock, but you may be able to go to the TurboSmart version. Keep the springs to 3.5 -5psi.

But I will buy a roll of vacuum line and just replace all lines this Sunday to see if that helps stall

Blown F-150

· #13 · 18 d ago

rramsey13 said:
The turbos came with new wg and bov and I replaced all the solenoid

Verify your cracking pressure as well. You'll want a cracking pressure of 3-7psi. If you're outside of that, it will cause the symptoms you are seeing. It's roughly 2 full turns of preload on the rod.

Reactions: 1

SrpRacing

· #14 · 18 d ago

Those symptoms sound like a boost leak. Also I recommend staying on the stock tune until you figure it out.

Did you ever remove the intercooler?

Reactions: 2

rramsey13

Discussion Starter · #15 · 18 d ago

SrpRacing said:
Those symptoms sound like a boost leak. Also I recommend staying on the stock tune until you figure it out.

Did you ever remove the intercooler?

I didn’t remove the cooler but I am keeping it a factory tune

rramsey13

Discussion Starter · #16 · 18 d ago

Blown F-150 said:
Verify your cracking pressure as well. You'll want a cracking pressure of 3-7psi. If you're outside of that, it will cause the symptoms you are seeing. It's roughly 2 full turns of preload on the rod.

I’ll check that here in a second thanks

Reactions: 1

rramsey13

Discussion Starter · #17 · 15 d ago

Blown F-150 said:
Verify your cracking pressure as well. You'll want a cracking pressure of 3-7psi. If you're outside of that, it will cause the symptoms you are seeing. It's roughly 2 full turns of preload on the rod.

The drivers side is like 6psi and the passenger side is like 7psi

Reactions: 1

rramsey13

Discussion Starter · #18 · 15 d ago

SrpRacing said:
Those symptoms sound like a boost leak. Also I recommend staying on the stock tune until you figure it out.

Did you ever remove the intercooler?

If it was boost leak wouldn’t it happen all the time not just at certain throttle positions?

rramsey13

Discussion Starter · #19 · 15 d ago

I plugged in my scan too and did a scan of all modules I seen in the pcm there is a stored code for wastegate solenoid a high. Which solenoid is a? The top or the driver or the passenger side? And would I have gotten that by unplugging it up top to check voltage while key on engine off?

rramsey13

Discussion Starter · #20 · 15 d ago

Cleared the codes drive a few times never came back tried a kam reset to no luck Matt buy some new vacuum lines tomorrow and start replacing. Any preference on vacuum lines for booster engines?

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