Hello HD fans,

Working on 2005 Sterling Acterra with Cat C7, KAL42252

Truck was towed in after just died while on freeway. Strong crank but no start. Getting good fuel & oil pressure from HEUI pump per scan data. Only thing we noticed was injector keep clicking while key on. Replaced timing sensors, solved the injector clicking sounds. But still no start. Got all active injector open codes through Cat ET, replaced HEUI pump based on diagnostic tree. Engine started and ran good for about 2 minutes before engine stalled out and will not restart. Replaced the Injector Actuation Pressure sensor this morning, still will not start.

Throughout all these part replacements, I was able to run Cat ET "injector actuation pressure" test and able to start & idle the engine. As soon as you "stop" the test, the engine will just shut off. At this point, I am focusing on the injector drive computer. Any thought?

Jim Wang
Owner/Technician
American Fleet Solutions
Alhambra, California, USA