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Three days on a phantom air leak, turns out it was the gasket all along
I spent the better part of last week chasing a low boost code on a 2015 Freightliner Cascadia out of Tulsa. Checked the CAC clamps, intercooler, even smoke tested the intake twice. On day three I finally pulled the EGR cooler gasket and found a hairline crack right on the edge. Replaced it in 20 minutes and boost was back to normal. Anyone else had a gasket failure that mimicked a boost leak this bad?
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grantadams21d ago
Man, I'd bet a cracked EGR cooler gasket is one of the most common things that gets misread as a boost leak. Half the time the smoke test won't even catch it because the crack only opens up once things get hot.
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