When inspecting EGR coolers, the inlet side matters most — it sees the hottest exhaust gases and the most abuse. On modern DD15 engines, Detroit eliminated traditional wastegates and turbo actuators. Instead, the EGR valve is used to control boost pressure.That’s critical to understand, because when the EGR system is removed or disabled, boost can spike uncontrollably, leading to serious engine damage. Add poor maintenance — skipped valve adjustments, overdue fuel filters, neglected oil changes
1:06
When inspecting EGR coolers, the inlet side matters most — it sees the hottest exhaust gases and the most abuse. On modern DD15 engines, Detroit eliminated traditional wastegates and turbo actuators. Instead, the EGR valve is used to control boost pressure.That’s critical to understand, because when the EGR system is removed or disabled, boost can spike uncontrollably, leading to serious engine damage. Add poor maintenance — skipped valve adjustments, overdue fuel filters, neglected oil changes
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