I've been having an intermittent hard start issue in the Sequoia. I did my research, and then proceeded to throw parts at it in at least a logical progression. I replaced the starter (fun!), battery, a number of sensors, and a relay. All in just spent a little time and money, but was stumped.

I took it to a reputable shop. They replaced fuel pump and regulator, but they were just throwing parts at it as well and didn't fix it. They spent the last few days digging in, and it looks like leaking fuel injectors (which was something I came across on the Toyota forums). They recommended replacing.

Question - I don't mind replacing them, but does it make since to clean them and replace O rings first? If I replace them, any suggestion on what to go with? There's a big swing in price online.

With everything else on the truck replaced at this point I'd say you might as well replace those too.

If it's definitely the injectors, I would say rebuild the injectors (new 'rings and run some bg 44k through your fueling system) and be on your way.

Have you checked your fuel pressure at the rails?

Yeah, that starter swap on the 5.7 is a real PITA!

I'm thinking about taking the injectors off and sending them to this place: https://www.advancedinjector.com/index.php.

Seems like it would be cheaper, and I would know if they are good or not.

Picard - I am pretty sure the mechanic checked that.

Yes that is a good path to go down more so for the diagnostic information.

Is it a flex fuel motor requiring 2 crankovers on cold mornings? Or more of an issue than that?