'95 XJ SE 4.0 auto, 162k miles.

Just got this Jeep back in my possession in August and most of my planned mods are done, but now I want to change out the stock injectors to some of the four-hole pintle type. My goal is a little better performance and perhaps some improvement in mpg.

When I first started reading on this forum, I thought I'd be heading to the junkyard to find a couple Chrysler 2.0's, but an Internet search shows the EV-1's / 703's are plentiful, at least on EBay. The problem is, which of the several available are of the best quality? Prices are from $65 to about $200 for a set of six that are remanufactured, with new O-rings & ready to install. That appears to be a better choice over junkyard units that require clean up, new o-rings, etc, unless the JY units are virtually free.

I've lived long enough to know that price does not always indicate quality, so I'm here asking the masses which is the better quality injector. The price range is affordable, so I'm most interested in the best quality I can find within the price range. Of course I'd hope the best are $65, but if the best are $120, that's acceptable.....if they really are the better quality.

Thanks in advance,
Remus

 

Don't know about "quality" but six reman'd 703's for $90 from this CF member and I now feel comfortable about passing people on two lane roads.

 

I agree. The 703s are proven and do make a difference. Would recommend.

 

http://rover.ebay.com/rover/1/711-53...mtid=824&kw=lg

You can get a set of Chinese ones for under $60. I've had them in my jeep a few months now with 0 issues, and runs 10's better than it ever has.

 

Not sure how true this is. Read recently that no matter what injectors are installed the PCM will still make adjustments to run at preset parameters. It makes a lot of sense to me in theory. For example, higher flowing injectors are installed. Because of higher flow rate the PCM shortens the pulse of the injector to end up with the same amount of fuel.

Alternatively the PCM could add more air to the increased amount of fuel. Not sure which it does but it makes more sense if it shortens the pulse of the injector because of the presets. So if that's true than wouldn't it make sense to just use stock injectors? Or maybe use injectors not necessarily higher flowing but ones with a better spray pattern to increase combustion efficiency.

 

It's not the flow amount that makes all the difference. It's the pattern of the spray.

And I don't believe the ecu can tell if the flow is higher. It's a timing issue with the Injectors. Not a measurement of flow. If the ecu says to open for 1 second, and you have two different flow rate injectors, the ecu will not adjust to tune the flow.

 

I went with precision auto injectors, they were pricey but im hoping very helpful. Definite upgrade to the orginal ones i had

 

Look at post 2. Go with those

 

All good info. I have pm'd the CF member that can assist...

As for whether it will make any difference, we'll see. When the Jeep was new, it consistently achieved 21+ MPG and now it rarely exceeds 15 MPG. I figure the thing most likely to help is clean injectors with a good spray pattern. It certainly can't hurt (much).

 

Aging O2 sensors will have a direct affect on your mileage as well. How old are they? When was its last tuneup? Better injectors are always a plus, but dont overlook the other stuff.