Right, so last night I performed a smoke test by connecting to the intake tract towards turbo, through intercooler & back up into inlet manifold.........& nothing at all, no leaks to spot. Had a good look at intercooler which is not bowed, cracked or leaking any oil so i'm now totally stumped. The 2 red codes I had were;
ECM-44B0 Have replaced position sensor & cleaned out egr valve.
ECM-135F signal too high Have performed smoke test, no leaks.
What next please?????
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