I have a 2000 Sterling Dump Truck with a Cat C10 and 8ll transmission. It's been running great for the 5 years I've owned it. Last week while carrying a load , the engine began to have a steady missfire on one cylinder while in high range or pulling a hill. It I let off the throttle, it stops making the noise. I took it to a shop that said they scanned the ECM and found a code for an intake temp sensor and leaking coolant overflow bottle. They quoted me $1100 to replace both and I declined the repairs. I changed out the sensor myself but it made no difference. I then checked the fuel pressure ar the secondary fuel filter head and it is 65-70 at 1800 rpm. Sound to me like a bad injector but how do I find it while under load?
The most reliable option is to connect a laptop with CAT ET to the engine and perform a cut-out test under load or while driving. There's no other way to identify a faulty injector on an electronic engine. Without a load, a cut-out test may show all injectors are OK, so it should be performed under load.
Thanks
Would you know where the fuel pressure regulator is located on a C10? I checked the fuel pressure at the secondary fuel filter housing and have 65-70 psi. I replaced the transfer pump but it made no difference in the pressure.
Please enter the engine serial number or prefix.
3CS12626
№5 Valve- Regulator
The filtered fuel pressure at an engine speed of 600 rpm ... 450 kPa to 600 kPa (65.3 psi to 87.0 psi)
Well, I guess fuel pressure is ok. It's reading 65-70 at idle but does not go up with an rpm increase. I'll pull the regulator out and check it for any sticking. Thanks for the photo.