Swapped a 7.3 injector on a '96 F-250 last week and the difference in cold starts was night and day.

Before, it would crank for a solid 10 seconds before firing. After that one injector, it fires right up in like 2 seconds. Has anyone else seen that big a change from just one injector or am I imagining it?

2 comments

2 Comments

eva_adams6820d ago

Hold on now, that's a pretty big claim for one injector on a 7.3. That old HEUI system fires all 8 injectors at once, so one bad one could be dragging the whole rail pressure down. It makes way more sense that you had a dying injector that was dumping fuel at rest, and swapping it just fixed that leak. That quick fire off is probably from better rail pressure, not the injector itself being magic. You might see a difference, but I'd bet you had other injectors on the verge of going bad too.

keith_rivera1920d ago

Good point on the rail pressure thing. It's like when you fix one leaky injector on a common rail system it brings the whole bank back to life. But yeah that HEUI system is weird cause if one injector is dumping fuel it starves the others for pressure. The quick fire off could also be from the oil getting up to temp faster now too since the bad one was dragging everything down with it. I'd be watching the rest of them like a hawk though cause once one goes the others usually follow pretty close behind in my experience lol.