hesitation on heavy acceleration

[Gemstone]

'05, 5.9, 6 speed 300K miles. Hesitation started all of a sudden. On an easy acceleration, there is no hesitation. On heavy acceleration, the hesitation starts, if I ease off the throttle, it smooths out. Changed the spin on FF105, no difference. The only code is P0477, Exhaust Back Pressure Regulator, which seems unrelated.

Thoughts ?

Regards
Gemstone

 

[Ozymandias]

It's the waste gate regulator that this code means, and they are well known to fail after some miles but mainly by age, the wires simply fall apart.

Do you monitor boost?

 

[Gemstone]

It's the waste gate regulator that this code means, and they are well known to fail after some miles but mainly by age, the wires simply fall apart.

Do you monitor boost?

I do not monitor boost, no additional gauges. Is hesitation a symptom of a failing "waste gate regulator" ?

Regards
Gemstone

 

[Ozymandias]

Id say so, if you're only build half the boost that's needed it slows down quite a bit.
But you don't need to throw parts at it, just watch the boost with a capable scanner to rule that out.

 

[AH64ID]

Do you have an exhaust brake? That code deals with the ECM control of the exhaust brake.

 

[Gemstone]

Do you have an exhaust brake? That code deals with the ECM control of the exhaust brake.

Yes, however the exhaust brake is working fine...

 

[AH64ID]

Yes, however the exhaust brake is working fine...

That’s what the code is related to thou.

Let me try to get a snippet of the service manual for you.

 

[AH64ID]

Best I can do on my phone.

Have you cleared the code and seen if it returns?

What intercooler is on your 05? Plastic or Metal end cap?

 

[Ozymandias]

Oh my, I mixed these two codes, sorry for that.

 

[Gemstone]

Yes, code 0477 returns after being cleared. Intercooler was replaced with metal cap in 2006, after failure.