Case 821F Lost Engine Messages but Kept Its Power and Grounds: The ECU Was Dropping Off CAN
Follow an intermittent Case 821F CAN timeout where engine messages vanished while the ECU's power and ground remained stable.
Tag AUTOOL
Volvo FMX Euro 6 Lost Rail Pressure: Testing One Injector at a Time Hid Six Leaks
Follow a Volvo FMX rail-pressure case where every injector leaked, hiding the result of ordinary one-at-a-time comparison.
Scania R480 Idled Rough and Smoked: A Known-Good Truck Exposed the Crank Signal
Follow a Scania R480 rough-idle case where a healthy sister truck made the damaged crank-sensor signal unmistakable.
New Flyer Bus Smoked and Misfired With No Codes: A Missing Injector Suppressor Was Ringing the Circuit
See how a New Flyer articulated bus with no codes, black smoke and misfire was fixed by restoring an omitted ICV suppressor.
JCB Telehandler VGT Fault Looked Like a Network Problem: The Actuator Was Losing Position
Follow a JCB telehandler VGT fault that sounded like network trouble but failed only when the actuator drove itself.
JCB JS220 Smoked and Stalled Under Load: Holding the EGR Closed Built the Known-Good Test
See how a controlled EGR A/B test identified the valve behind a JCB JS220 black-smoke and stalling complaint.
Fiat Kobelco E135 Kept Killing Stop Solenoids: Alternator Ripple Was the Cause
See why a Fiat Kobelco E135 kept damaging stop solenoids until alternator ripple was measured and repaired.
DAF CF DEF Warnings Did Not Need a New Pump: The Filter Was Restricting Flow
Follow a DAF CF DEF warning through pressure and flow tests to a restricted filter rather than an automatic pump replacement.
2017 Mercedes Arocs Fuel-Pressure Fault and Knock: Noise Led to a Cracked Injector
See how fuel noise, return bubbles and vibration evidence led to a cracked injector on a 2017 Mercedes Arocs.
2014 Ford B-Max P0102 After a New MAF: One Feed Wire and One ECU Ground Were Both Bad
Follow a Ford B-Max P0102 past a replacement MAF to a broken supply wire and a second failed ECU ground path.