So how does the EGR system actually work on a DD15? The DD15 uses a three-piece exhaust manifold, and the EGR passage is built directly into the center section of that manifold.When the EGR valve opens, a portion of exhaust gas is diverted through a hot pipe and into the EGR cooler. Inside the cooler, exhaust gas flows through internal tubes surrounded by engine coolant. The gas enters extremely hot and exits at a lower temperature before being routed back into the intake.It’s still hot — just c
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On the intake side of the DD15, exhaust gas recirculation completes its path back into the engine. The EGR cooler feeds exhaust through a tube into the intake, and a delta-P (differential pressure) sensor monitors pressure on both sides of the system.That sensor — along with others like the intake temperature sensor — helps the ECM control the EGR valve. If the delta-P passages clog, EGR flow becomes inaccurate and drivability problems begin. Earlier designs tried using an intake throttle valve
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On a DD15, the EGR system recirculates 30–40% of exhaust gases back into the intake — and that changes everything. Those intake temps jump from normal Series 60 levels of 90–160° all the way up to 250–400°. That’s a massive difference in how the engine runs, performs, and wears. Understanding this helps you diagnose issues faster and avoid unnecessary breakdowns.TAT Express4140 Langdon Rd, Dallas, TX 75241972-225-3017Google: https://maps.app.goo.gl/KzW9PgYB8Vr7Vw8x7?g_st=ipcFull Video: Why Is Th
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