I bought a set of 703 injectors to upgrade my 97 4.0, my question is, I'm sure new o-rings will go a long way, which o-rings do I purchase? Factory ones for my 97 or do I need to get some from a different model?

 

Factory will be fine as they're the same size.

 

Honestly if the o-rings are still soft and have no cuts/cracks they will work fine.

 

X2 Reuse if they look and feel decent... Vaseline to lubricate.

 

Actually Vaseline is not recommended. If ingested by the injector on the fuel side, it can clog injectors. Clean motor oil is what to use. Vaseline should be kept in the house.....

 

Or... In the bathroom... Or on the end table of your bed

As far as o-rings, I would definitely replace them regardless of how they look and feel, unless you have proof from the seller that he/she installed new ones. You can get away with oil leaks. Gasoline leaks however... That's a different story.

I'd recommend Felpro o-rings. Like cruiser said, a dab of clean motor oil is how you should get em in there

 

Yeah, new is better. They're super cheap and nobody likes a Car-B-Que.

 

I believe the felpro part# is 70599 they come in sets of four

 

Uhem! That's Jeep-B-Que

I'm thorough with my inspection and I test for leaks so I reuse what I can.

I'm a cheap bastard too.

 

Aw c'mon. Reusing injector o-rings is like hanging your toilet paper out to dry.

 

Hahahahaha love it

 

After posting of course i spent 10 more minutes searching for the answer and found it. I spent 10$ at oreilly for new orings, I'm cheap but for 10$ I'll survive.

I didn't use vasoline because I've always heard that it will eat rubber over time, don't know about the truth of that or not. Jeep runs great, starts quicker, better throttle response. The injector ports work pretty gunked up, all cleaned up, hoping to pick up a couple mpg's!

 

LOL You gotta use micro fiber towels. Nice, soft, and washable. Toilet paper dissolves.

 

I'll make a note of that.