Low idle when warm (engine's cut out once) - Boost leak test advice needed.

[sayn117]

Hey guys, so my Legnum has a low idle when the engine is hot. It starts perfectly fine when cold but the idle drops to around 600 when warm and the engine has cut out once when coming to a stop at an island. Under acceleration the car is totally fine though.

I’m planning on doing a boost/vacuum leak check at the weekend before I start troubleshooting parts so I’m looking for some advice on that process. I’ve got a bung made for the compressor hose and have an air regulator on the way. Do I need to add a bung to another part of the system to pressurise it whilst I check for leaks?
I’ve watched Mark’s video on YouTube so it looks like I need to remove the hard Y pipe to add air down by the washer bottle. Would I need to blank off any other parts of the system?

Also, I have a TurboSmart manual boost controller with a built in bleeder valve so I’d imagine I’d need to remove that too?

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