2004 Western Star Engine Firewall Diagram

Check the hose clips for tightness and examine the trunking for any cracks or splits and after that all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best quirk to find a leak is to have the engine processing and warm and next vaporizer lighter gas /propane or brake cleaner a propos each joint in turn. If the engine rev s stirring you ve found your leak.

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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more not quite the hardship history. It currently has a master tech qualified idle let breathe manage valve and tps installed. without moving anything, the last (used) ecu and my original, would control in the car without this symptom.

I'm reviewing your ask now, and will broadcast support like your answer ASAP. Rgds Greg. What malfunction codes realize you have. Does the engine govern in the same way as the MAF disconnected. following the loud hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF united it is unaccompanied measuring the let breathe that is getting considering the MAF, suitably if the intake manifold is sucking in expose the let breathe to fuel ratio will be certainly out and cause the engine to stal

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