Troubleshooting the 6.5 Diesel Optical Sensor
If you've spent any time under the hood of an old Chevy or GMC truck, you probably know that the 6.5 diesel optical sensor is one of those parts that can make or break your day. It's a tiny little component sitting inside the Stanadyne DS4 injection pump, but it carries a massive amount of responsibility. When it's working right, your engine hums along just fine. When it starts acting up, it feels like your truck has developed a mind of its own, and not in a good way. ...