A Tata with a Quadrajet BS IV (90 ps) diesel engine was brought in for low power. When starting the engine in a no load condition the turbo boost pressure is 950 mBar. When the engine accelerates the boost pressure dropped. Regarding this issue the service manager said the turbocharger is not working properly, so it was replaced.
After installing a new (re-man) turbocharger the boost pressure increased and the maximum is now 1.3 Bar. The service manager says this is too low, the minimum spec is 1.7 Bar.
Before replacing the turbocharger again are there other things that should be checked?