I swapped to the 784 injectors in my jeep. Bought them off a guy on eBay. Supposed to be refurbished and tested. Before I did the swap my jeep would start up right away now it takes a couple seconds to fire up. Could it be a leaking injector that's flooding my motor and if so how do I figure out which one it is. Didn't happen until I did the injector swap. If you have any ideas let me know.

 

Maybe. How many starts have you done with the "new" injectors?

 

Probably around 20 times. I just put them in last Thursday. It also starts right up when it's warm. Only does this after it's been sitting even if it's only been an hour.

 

Did they look like new when you received them, and have all new O-rings?


Are you sure that you didn't accidently tear any of the O-rings when installing? If you don't mind me asking how much were they, cheaper than the seller here on the forum?

 

They were like $70 with new O-rings. And they looked new. And I don't think I did I'll probably pull it off and look tonight and just check them.

 

Reason I asked was when my son installed his and was having a problem, I kept asking him the same question and he said no.......After 2 weeks he did pull and check them and by now you guessed it.

 

What was wrong with his?

 

Torn o-ring.

 

That's good info. I'll definitely be mindful of this when i install my 784s.

 

X2 on the O-rings. Those little buggers if defective will cause you a ton of problems.

 

Did you reset the ecm after the install? That could cause some problems when installing new stuff on an engine that is used to different parts.

 

Not required for injectors, the fuel pressure at the rail is consistent, just has better atomization due to better spray.

 

I've seen a few people on here say their fuel mileage and other minor things suffered after the install until they reset. I installed mine with a 62mm TB, header and intake at the same time, so I definitely reset mine afterwards. If I was experiencing problems after the install and all the o rings are good and everything else is connecting properly, I would probably give it a shot.

 

Yeah if he installed other critical parts id completely agree. At the same time when working on anything fuel /electrical related you should discharge static and remove the battery terminals which should reset the PCM and allow it to learn the new injectors.

 

So I found out I had two torn o rings. Replaced them and I'm still having the same problem. Any suggestions?