Keep dogs off the
grass... And cats
Join Date: Oct 2009
Location: United Kingdom
Signs of a split boost pipe?
Car in question is a 156 1.9JTDm 16V. And now for the issue. I've noticed over the past week or so I can hear the turbo alot more. The sound is akin to police sirens in the distance. In higher gears at speed the car does seem to have less grunt as well. Could this be symptomatic of a split boost pipe?
The upper pipe from what I can see is fine, however it is my understanding that to get to the lower pipe, I'll need to jack up the car and get the undertray off first. Is this correct?
To avoid doing this, I figured that if there was a split in the pipe, I'd be loosing boost. So I've just taken the car for a quick spin with FiatECUScan running, monitoring engine RPM, throttle position, desired boost pressure, and finally actual boost pressure. Would this be an accurate method of diagnosis? Looking at the results there are points where actual boost pressure is 200millibar below desired pressure - is that enough to notice lack of power?
I've attached a CSV of what was recorded if you want to take a look.
So could this be a split boost pipe, or am I looking at something more sinister to do with the turbo itself?
Any responses/tips appreciated.