Did you buy and install the Paccar DAVIE4 diagnostic program, but can't get it to work on 2016 and later Peterbilts and Kenworths? Does ...

Caterpillar C7 fuel pressure diagnosis. This post concerns how fuel pressure is developed and regulated. I’m writing it after getting a ...

I was recently involved in a repair of a 2006 Mercedes MBE 4000 with a hard start problem. The customer said it wouldn't start without...

Hello. This post concerns a recent repair I did on a customer's Detroit Series 60 DDEC V. The truck came in with the check engine ligh...

This post concerns a dash light problem on a Freightliner FB65 bus. Hello, all. I wanted to share a kind of a strange problem I recently...