If your truck is experiencing frequent regenerations, aftertreatment check engine lights, or poor fuel mileage, it’s worth having the Delta-P sensor system inspected before replacing major components. We see this issue regularly in the shop. 📞 Call TAT Express – Dallas Diesel Repair 972-225-3017 📍 Dallas, TX #regenproblem #semitruckrepair #dieselmechanic #truckrepair
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If your truck is experiencing frequent regenerations, aftertreat…
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How the One Box Aftertreatment System REALLY Works DOC, DPF, SCR Explained Most drivers and even some techs misunderstand how the modern one-box aftertreatment system actually works — and that misunderstanding leads to repeat failures, constant regens, derates, and unnecessary parts replacement. In this video, I break down step-by-step how exhaust flows through the one-box system, starting after the turbo, how fuel dosing is used to raise exhaust temperature, what the DOC actually does, how soot
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How the One Box Aftertreatment System REALLY Works DOC, DPF…
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This truck came in with a throttle pedal not responding concern, creating a serious drivability and safety issue. When the throttle pedal doesn’t communicate correctly with the engine, the truck may not accelerate as commanded — or may not respond at all.💡 Why a throttle pedal can stop working:• Faulty accelerator pedal position (APP) sensor• Damaged or loose wiring and connectors• Corrosion inside the pedal connector• Internal electronic failure within the pedal assembly• Communication issues
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This truck came in with a throttle pedal not responding concern, cre…
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After replacing a failed fuel injector on cylinder #4 on this DD15 engine, our specialist tech performed a fuel pressure test to verify proper system operation. As shown in the video, fuel pressure remained steady and within specification throughout the test, confirming the repair was successful.💡 Why a fuel pressure test is important after injector replacement:Fuel injectors directly affect rail pressure and fuel delivery. A faulty injector can cause pressure fluctuations, poor combustion, mis
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After replacing a failed fuel injector on cylinder #4 on this DD15 engin…
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Most drivers and even some techs misunderstand how the modern one-box aftertreatment system actually works — and that misunderstanding leads to repeat failures, constant regens, derates, and unnecessary parts replacement. In this video, I break down step-by-step how exhaust flows through the one-box system, starting after the turbo, how fuel dosing is used to raise exhaust temperature, what the DOC actually does, how soot is trapped and oxidized in the DPF, and how DEF and the SCR reduce NOx bef
2:31
Most drivers and even some techs misunderstand how the modern o…
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EGR Valve Inspection: Ensuring Free Flow on D13 Engine
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EGR Valve Inspection: Ensuring Free Flow on D13 Engine
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Air Compressor Failures That Quietly Destroy DD15, X15, D13 & MX 13 Engines Coolant keeps getting pushed out while you’re driving… but comes back when you shut the truck off? That is NOT normal coolant loss. On modern semi-trucks — Detroit DD15, Cummins X15, Volvo D13, and PACCAR MX-13 — the air compressor is liquid-cooled. When the compressor head or casting fails, compressed air gets forced into the cooling system and pressurizes it. From the outside, it looks exactly like a blown head gasket.
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Air Compressor Failures That Quietly Destroy DD15, X15, D13 & …
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💨🚛 Trailer Air Lines Leaking – Service & Supply Lines Identified 🚛💨 During i…
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Trailer Leveling Valve Leaking: Impact on Suspension Control
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💨🔧 Injector Fuel Lines Installed & Torqued to Spec – Leak-Free Finis…
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After installation, our specialist tech properly adjusted the Power Take …
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EGR Ports Inspection: Ensuring Clean Diesel Performance
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⚙️💨 Leveling Valve Installation – Air Suspension System Restored! 💨⚙…
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If you see sparking coming from the back of a Thermo King alternator, …
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🔧📏 Valve Adjustment In Progress – DD15 Engine 📏🔧In this video, our spe…
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While performing a clutch replacement, the transmission wa…
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⚠️ Air System Contamination Builds Long Before Failure Don’t …
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Exhaust Port Inspection and Troubleshooting Guide
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🌬️🛠️ Cabin Air Filter Found Extra Dirty – Replacement Recommende…
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During inspection on this truck, our specialist tech found the air suppl…
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💨🔍 Intake Leak Found – Cummins X15 Engine Inspection 🔍💨During inspecti…
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⚙️🧰 PTO Pump Inspection – Checking for Shaft & Internal Dam…
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💨🛠️ Air Leak Detected – Foot Brake Valve & Fitting Inspection 🛠️💨In thi…
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During inspection, our specialist tech found coolant hose clamps le…
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As part of a front-end inspection, our specialist tech performed a ki…
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This is why inspections matter.You’re hearing the air leak …
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Our techs don’t cut corners—we go the extra mile to check for hidden …
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🛠️💧 Air Compressor Bypassed – Confirmed Failure on This DD15 E…
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During inspection, our specialist tech found the EGR cooler extrem…
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Coolant keeps getting pushed out while you’re driving… but comes …
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