Hi, first time poster here. You guys seem to be friendly and knowledgeable. New to the 2.7l diesel, but not diesels in general or MB diesels. Am actually working on the neighbor's sprinter(1 owner), so bear with me...It has either 137 or 173k miles on it.
I can invoke overboost(p0234) at will. It takes a multisecond application of calculated load of over 90/95% at over 2000 rpm to do it, but does it like clockwork. One time I got the underboost(p0299) code. I'm using a Bosch 1150 to pull the codes, what's stored at the time of fault, and for real time supported data. The overboost code and LHM get triggered at 75.9(reported) inches Hg MAP, which works out to be about 22psi of boost. Cruising on flat level ground at 65-70 results in boost of about 13-14 psi, which seems high to me(I'm used to seeing 3-4 in my truck), but may just be normal tuning for this engine. Of interest, is that when LHM is triggered by underboost the vehicle is far more drivable than when LHM is triggered by overboost.
I have removed the original resonater and epoxied the seam as part of my diagnostics. Have also removed and inspected all the air hoses which look good. The left/cold side had been replaced a couple of years ago the usual split on the underside.
The turbo itself, by the finger test has more radial play than I would expect, but has zero axial play that I can feel, spins freely and does not contact the housing. Took the circlip/actuator rod off of the turbo. Actuator rod moves up and down as one would expect when reving engine(2500 rpm) and back to idle. The arm itself going into the turbo to move the vanes is a little stiffer than I would expect, particularly the last little bit on the 'off' end.
Questions:
How easily is the actuator arm supposed to move?
Any quick, dirty & cheap intercooler pressurization tricks? I know not to exceed 20 psi.
How much coolant loss if removing the EGR? I have heard a high pitched noise coming out of it for a period of time(up to a min) after turning the ignition off.
Anything else I should check?
I can invoke overboost(p0234) at will. It takes a multisecond application of calculated load of over 90/95% at over 2000 rpm to do it, but does it like clockwork. One time I got the underboost(p0299) code. I'm using a Bosch 1150 to pull the codes, what's stored at the time of fault, and for real time supported data. The overboost code and LHM get triggered at 75.9(reported) inches Hg MAP, which works out to be about 22psi of boost. Cruising on flat level ground at 65-70 results in boost of about 13-14 psi, which seems high to me(I'm used to seeing 3-4 in my truck), but may just be normal tuning for this engine. Of interest, is that when LHM is triggered by underboost the vehicle is far more drivable than when LHM is triggered by overboost.
I have removed the original resonater and epoxied the seam as part of my diagnostics. Have also removed and inspected all the air hoses which look good. The left/cold side had been replaced a couple of years ago the usual split on the underside.
The turbo itself, by the finger test has more radial play than I would expect, but has zero axial play that I can feel, spins freely and does not contact the housing. Took the circlip/actuator rod off of the turbo. Actuator rod moves up and down as one would expect when reving engine(2500 rpm) and back to idle. The arm itself going into the turbo to move the vanes is a little stiffer than I would expect, particularly the last little bit on the 'off' end.
Questions:
How easily is the actuator arm supposed to move?
Any quick, dirty & cheap intercooler pressurization tricks? I know not to exceed 20 psi.
How much coolant loss if removing the EGR? I have heard a high pitched noise coming out of it for a period of time(up to a min) after turning the ignition off.
Anything else I should check?