Hello everyone,

I'm a proud owner of an '04 powerstoke F-250 and live in Switzerland.
Use it for pulling large trailer and snow-ploughing.
So far my story:
- Purchased F250 (autotrans.) about 4 months ago. Now about 20k miles.
- At first worried about the "famous" turbo-bark, then read forums and took it up as being normal. Performance allways excellent, allthough noticed "barking problem" kind of "comes and goes". It does not allways happen.
- When barking happenes I noticed that if you pull out and select transmission into neutral, and rev the engine a couple of times, the barking problem dissapears, .. for a while. Then, after driving for a while, it comes back.
- Load pulling so far no problem.
- Lately (ford) dealer carries out 20k service. He replaces EGR and loads new(?..) engine software (all for free). Said it was a recall and he had to do this as warranty.
- Picked up car from service and drove home 2 hrs. Car seemed to run better than before.. kind of more precise to throttle response. Was very happy.
- Nex day motorway driving: when engine under load uphill turbo starts barking, and I get cyclical power loss... with irregular turbo barking. Car kind of "joults"!... Same on next hill, then it dissapears for a while, .. then it comes back.
- Tried pulling trailers: same problem. When engine under heavier load, turbo starts barking, and I get power-loss.
- Bizzarrely, when in the "non-barking phase" engine takes any load!.. Runs great, untill barking-under-load-phase sets in again.
- Read forums looking for help: someone mentions MAP sensor, but does not seem to be answer to problem.
- Dealer first mumbled something about MAP sensor, then called me back and sait turbo has to be changes since the veins stick.
- Came across your forum, someone mantioned very similar problem, claiming problem went away after CHANGING TURBO!...

Can anyone say something more to this please? Anyone had same case? Did problem go (and stay..) away after changing turbo?

Thanks everyone, appreciate your help. Eug

 

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Thread moved to 6.0L Power Stroke Diesel forum.

See ya on the boards!

-Matt

 

Hi there Matt,
my powertroke does 15 ltrs. / 100 km :-) guess you have to work that one out in mpg. It's regular as a clock. When towing I can get 20-23 ltrs. on 100 km.

See ya, Eug

 

explain what you mean by "barking"? Is it like a surging - if it is I wonder if fuel filters might be partically plugged. I've gotten bad fuel and after 5000 miles had to change fuel filters (both of them). Also try using a fuel additive to boost cetane level. Or try to get premium fuel.

 

Mine ('03) does the same, probably because of turbo over-boost (it also under-boosts, but different symtoms- hesitant & lack of power). Some feel that this over-boost leads to puking coolant (yea, mine does that too). I've had 4 (yes, FOUR) turbo replacements and it still "barks"- not to be confused with a turbo fart, which happens when you let UP on the pedal. Ford won't acknowlege the problem, and my local dealers won't do anything about it, probably because I'm on my Regional Service Representative's s^!t list. My lawyer contacted F@rd last week about a buyback.

 

Thanks, but fuel is fine and filters too. These are essential things I look after.
What I mean by "bark" is overboost-let-off. But someone now just mentioned I should not confuse this with the overboost noise I get when letting off the accellerator... To me it sounds the same. I'm confused now :-)

 

Hi,
I just had the underboost problem before. It vanished by changing the EGR and reprogramming engine. Now I get the problem at the other end... Overboost under load(!..). And, yes, I do the the usual fart when I let off throttle, but what gets me is that it is irregular: sometimes it there, sometimes not. To make it go away I simply rev the engine in neutral for a couple of times and the all problems (including the fart one) dissapear. But then, after some time, it comes back.
Funnily enough, it goes away on it's own account too!

Oh dear! 4 turbo replacements allready!... The problem MUST sit somewhere else then. Any idea about the MAP sensor? -Eug

 

They are the same, in that the boost is blowing back thru the air filter with each. F@rd claims the bark (or fart) when letting off the pedal is normal . Currently, in my case, F@rd refuses to acknowlege that it is happening when accelerating under load (and sometimes when empty).

I just didn't want some "expert" tell you "not to worry, its normal".

 

Eug, try disconnecting the egr plug and see if it still does it. If it does, that might be a helpful diagnosis for your diesel tech to reference. I had a very similar problem with mine and disconnecting the egr made it go away. I told the Shop Forman at Ford about how the egr disconnect cleared up the problem and they installed a program that lowered the shifting points and now I can leave the egr plugged in.
Good Luck, Tim

 

Thanks about reassuring me it's not normal.

Tim, the egr idea is good. I'll try that.
Now, when you say the ford guys can install a programme for "lower shifting points"... what do you mean exactly?
Do you mean transmission shift? ....
Because if you do, it would not make a great difference for me. I get the irregular "farting" when pulling heavy loads at constant engine load, not so much at the point the transmission shifts. When towing under load, and I begin to climb a hill for example, as load increases so does the turbo boost. But at some point this gets too much and the turbo develops overboost and begins to fart.
Could it be that the "new"(?) software which the ford guy just loaded me is running the engine parameters "too high"? .. Are there more such (original) ford programs? I guess that my turbo wants the "softer" version.... could this be?

Thanks - eug