c250 turbo intermittent loss of power

[shaungriff]

occasionally my c250td goes flat ... it mainly happens when the engine temp is cold or cool. basically when driving it''ll rev right round the rev counter but has hardly any umph as if the turbo's not working .. then once the temp gets almost up to normally the turbo can be felt to come in as normal. if it had a MAF sensor i would think its that but its got the vacumn operated MAP sensor. i've removed the vac pipe to it & its clearetc. i can't see any split vac hoses or any other pipes. i've tried plugging in my sykes acr4 scanner but i can only read/erase fault codes... there wasn't any... i was hoping to see live data such as coolant sensor etc . any one got any ideas ?? thanks shaun

 

[star]

occasionally my c250td goes flat ... it mainly happens when the engine temp is cold or cool. basically when driving it''ll rev right round the rev counter but has hardly any umph as if the turbo's not working .. then once the temp gets almost up to normally the turbo can be felt to come in as normal. if it had a MAF sensor i would think its that but its got the vacumn operated MAP sensor. i've removed the vac pipe to it & its clearetc. i can't see any split vac hoses or any other pipes. i've tried plugging in my sykes acr4 scanner but i can only read/erase fault codes... there wasn't any... i was hoping to see live data such as coolant sensor etc . any one got any ideas ?? thanks shaun

Check out the boost control solenoids which operate the egr valve and the waste gate diaphram.

 

[c250td auto]

250TD power loss cured!

I had a similar problem. One day, under full acceleration, I noticed a hiss - this was not unusual on my car, and I'd assumed that this was simply the boost of the turbo. But this day the hiss suddenly went and the power dropped immediately. The car then slowed as if it was being starved of fuel ... or air ... discussing this with my mechanic (Penfield Motors, SE1) and it sounded like a vacuum was being created between the intake, intercooler and turbo, and he quickly found a perished pipe. This pipe looked fine cold, but was sufficiently damaged to collapse under pressure and restrict airflow to the engine, hence loss of power. I presume my pipe was specific to my car and that other cars might suffer similar problems with one of the connections between the intake and the turbo. Hope this helps.