So I have an injector that I think is toast. My question is how can I test for which injector it is. All I have is a scan gauge. But that's it on the scanner side of things. Also just did a bunch of work would a loose harness at the ficm show up as a bad injector? The truck is jumping a lot at around 1500 rpm and around 45 50 mph did them Sam thing It did last time I did an injector.

 

Down load torque pro or Forscan, it's 5 bucks for either one. Get a OBDll dongel off eBay and you have a pretty decent scanner for 25 dollars. Scangauge isn't very good for codes. You'll be able too see which injector is out.