ISB 6.7 CM2150 problem
04-02-2025, (Subject: ISB 6.7 CM2150 problem ) 
Post: #11
RE: ISB 6.7 CM2150 problem
So I was looking at this again with Insite. Everything is still the same with the following observations:

RPM's will not go above 1100, engine sputters and stumbles, but will go back to idling great. Grey smoke mostly on acceleration.
Intake manifold pressure still at 0.0inHg 0.63v. Does not change
Fuel rail pressure will not go above 19k, except it goes to 24k on leakage test
Fuel pump actuator - position Closed. Current stays 1375mA drops to 1250mA upon acceleration
Turbo Commanded equals Measured - 31% to 65%max
Turbo Actuator Position Sensor Voltage always 0v
Turbo Compressor IAT sensor stays at 2.13v only
Turbo rpm up to 19k down to 6594 steady
Engine oil pressure 0v but gauge works
No boost (you can hold your hand over the outlet and it will not push your hand away)

I have done the following:
Changed turbo actuator, realigned gear, and calibrated with Insite
Disassembled turbo, cleaned everything thoroughly, and made sure vane ring and lever moves freely. Compressor spins great
Drained fuel and installed new filters
New IAT
Demandated everything and properly tuned

Insite tests:
Cutout test fine. All cylinders will reduce RPM approx 50rpm upon cutout
Cylinder performance test all pass
EFC Actuator override test - position open

Am I missing something or do I just need to throw some money at it with a new turbo? Thx!
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Messages In This Thread
RE: ISB 6.7 CM2150 problem - Stovedude - 04-02-2025



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