You may have a boost leak in your truck, if you're having symptom's like low boost, change in turbo sound, poor shifting, over fueling, lazy response, and/or delayed shifts.

Testing for a boost leak involves identifying potential problem areas in the turbocharging

system and performing a series of tests to isolate the leak. A boost leak can lead to

reduced engine performance and efficiency.

Here's a step-by-step guide on how to test for a boost leak:

Note: Before starting the tests, make sure the engine is off and has cooled down

to avoid injury.

Tools Needed:

-Boost pressure tester.  

-Soap and water solution or a commercially available leak detection spray.

-Basic hand tools.

-Assistant (optional but can be helpful).

Check out the link below if you want to build your own Boost Tester.  Otherwise, they

are available online, as well as other links to home made versions.

Build your own Boost Leak Tester

Steps:

1.  Inspect the Intercooler System:

-Look for visible signs of damage, such as cracks or loose connections, in the

intercooler and intercooler piping.

-Tighten any clamps or connections that appear loose.

2.  Check the Turbocharger Connections:

-Inspect the turbocharger and its connections for any visual signs of damage or oil

leaks.

-Ensure all hoses and connections between the turbocharger and intercooler are

secure.

3.  Check the Charge Air Cooler (CAC) System:

-Check the charge air cooler (CAC), also known as the aftercooler, for any damage or

loose connections.

-Make sure the CAC is free of debris or obstructions.

4.  Pressure Test the System:

-With the engine off, connect the boost pressure tester to the intake manifold or

intercooler system's pressure port.

-Apply pressure to the system (typically not exceeding 20 psi for diesel engines).

-Use a soap and water solution or a leak detection spray to check for bubbles around

the intercooler piping, turbocharger connections, and CAC system. If you see bubbles, it

indicates a leak.

5.  Inspect MAP sensor hoses:

-Examine all hoses connected to the turbocharging system for cracks, holes, or

disconnections.

-Replace any damaged hoses.

6.  Check for Loose Clamps and Fittings:

-Ensure that all clamps and fittings in the turbocharging system are tightened properly.

-Tighten or replace any loose or damaged clamps.

7.  Test with Assistance:

-If available, have an assistant start the engine while you monitor the system for visible

signs of leaks or listen for any audible hissing noises.

-Carefully inspect the system while the engine is running at idle and while revving the

engine.

8.  Check for Other Signs of Boost Leak:

-Look for other symptoms of a boost leak, such as decreased power, reduced

acceleration, excessive smoke, or a whining noise from the turbocharger.

If you have any questions or need replacement parts for your truck, give us a call or

send us a message at sales@idspeedshop.com

Boost leak reference:

Philip Thomas, Wrenchin’ Wednesday: DIY boost leak detector!