Is this the right replacement injector? what about O-rings?

[JedCoop]

I finally got around to replacing my #7 injector on my '94 Q. The great news is that I got it out without pulling the plenum

I bought the replacement injector from Scottsdale, but it looks different. You can tell the old injector by the *stress* it received on its plastic upper section. The new one looks like other injectors I've seen pictured here, but I thought it would be worth verifying if this is correct.

Also what about the o-rings? The old injector has o-rings. Shouldn't the new injector come with new o-rings too?

[metaverse3]

It does not look correct.. On the old one the inlet filter is right below the o-ring. on the new one, it is below the plastic sleeve. The new one is designed for a different rail.. The part is wrong..

Take a look at this page: http://catalog.worldpac.com/ea...ector

This should give you an idea of what you are dealing with..

[JedCoop]

It does not look correct.. On the old one the inlet filter is right below the o-ring. on the new one, it is below the plastic sleeve. The new one is designed for a different rail.. The part is wrong..

Take a look at this page: http://catalog.worldpac.com/ea...ector

I see the difference. My old one looks like: http://catalog.worldpac.com/ea...36327which is different than the new one. They have 3 different listing 2/1993 - 6/1995.

When I called Scottsdale I asked them if I should buy the "white" injector or the "black" injector they listed - I was told it didn't matter. I don't even remember which color I picked. I guess I'll let my car rest for a couple of days until the right parts come in

Before you pull an injector how are you able to know which one to use?

[metaverse3]

I see the difference. My old one looks like: http://catalog.worldpac.com/ea...36327which is different than the new one. They have 3 different listing 2/1993 - 6/1995.

When I called Scottsdale I asked them if I should buy the "white" injector or the "black" injector they listed - I was told it didn't matter. I don't even remember which color I picked. I guess I'll let my car rest for a couple of days until the right parts come in

Before you pull an injector how are you able to know which one to use?

This is the sad part about nissan.. It is a gamble. The injectors are supposedly ID'd by a colored dot on the plastic part...black/white/purple/green/yellow Good luck trying to check that out after years of wear and tear where the plastic is practically faded and the area is hard to reach to begin with..not to mention trying to get a visual... I'm truly blown away by the variations on the Q45.. Such a radical change where the injector design is completely changed.. On the maxima's, the variations have to do with coil design and flow rate to corroborate with ECU changes.. No major difference like the inlet filter position where it fits a different style rail.

Well, at least you now know what to buy. Keep that in mind and then go from there. For the o-rings, buy the nissan OEM. (no homedepot..heard of that before) put some vaseline on the injector groove and on the o-ring and slide them on. It should then slide on the rail and lock in place.rotate the injector in the rail to make sure you don't have any kinks or pinches in the o-ring.. Good luck with the job..

[911/Q45]

The purple one is for the 90-93 Q.

[elwesso]

The 94+ didnt have the different dots indicating the different spray patterns, due to the intake runner redesign...

[JedCoop]

The 94+ didnt have the different dots indicating the different spray patterns, due to the intake runner redesign...

I doubt there there was a dot on the one I pulled, though I ruined it while learning how to extract a partially hidden injector. No dots on the other injectors that I can see, either. The one I bought has a white dot.

My car was built 2/94.... which design is newer? I wonder why they changed the design?

[elwesso]

You have a late model 94... THe early 94s started in late 93 (say 10-93 or so)...

THe reason they changed the design was from a pintle design to a 3 hole design.. They redesigned them for apparently better longevity, and also the spray pattern was different since it didnt have the split manifold at the head...

[JedCoop]

This is confusing, and it shouldn't be.

The Scottsdale parts folks talked to the service department. They say that the injectors are interchangeable, that the ones in my car are NOT the updated ones. The o-rings are in the same positions relative to the end, etc. They do not have any other injector specified for the car.

But they acknowledge that there may be slight differences between them - how they spray fuel. I am tempted to buy a Bosch injector that visually matches instead of using these infiniti parts which do not match.

[Jesda]

Even if they dont "match" they work fine. I just replaced three injectors on my 92 without regard to the color of the dots on top.

The updated injectors with different nozzles only work on the 94 fuel rail with 94 connectors -- doesnt matter who makes them.

[metaverse3]

This is confusing, and it shouldn't be.

The Scottsdale parts folks talked to the service department. They say that the injectors are interchangeable, that the ones in my car are NOT the updated ones. The o-rings are in the same positions relative to the end, etc. They do not have any other injector specified for the car.

But they acknowledge that there may be slight differences between them - how they spray fuel. I am tempted to buy a Bosch injector that visually matches instead of using these infiniti parts which do not match.

All injectors are made by Bosch, period. Even the original one marked "jegs" from the 90's. Put back in what came out of your car. You know something does not look right and you have found the right part that looks identical to what came out of your car. Do not change what you have control over. Buy the injectors I linked below if scottsdale does not have them. It is free shipping over $50 and probably cheaper to begin with. I have purchased over 3 sets of injectors from that site: http://www.europeanautomotive.com for nissan/infiniti plenum jobs. They work fine. I run a set of 6 in my own maxima for the past 2 years with zero issues. If Scottsdale does not have what you want, go buy it where you found it.

The o-rings lining up mean absolutely nothing. The inlet filter is in proportion with the fuel rail feed. A small change such as a quarter inch high/low can change how fuel flows through the injector. The injector you linked from scottsdale is a radical change in my book. I can tell you how one injector can completely throw off a car's characteristics.. I have seen mismatched injectors in place..it makes the difference from a running car vs a Jalopy.. You obviously went on this injector replacement mission to fix an improper running car to begin with.. Don't risk buying the wrong part and then redoing the job twice..not to mention the cost of the part and the time you invested that cannot be returned..

[JedCoop]

...Put back in what came out of your car. .... Buy the injectors I linked below if scottsdale does not have them. ..... They work fine. ......... If Scottsdale does not have what you want, go buy it where you found it.

metaverse

Already ordered those bosch injectors you pointed me to. Thanks so much for the good advice! ( And they are almost $40 cheaper, too. ) I can believe they are all Bosch anyways, Bosch generally makes it parts within tighter tolerances than required.

Maybe this is a parts inventory reduction tactic as these cars age. Similarly I think they did away with the 90-93 stiffer OEM struts and now sell the same softer OEM strut for all 90-96's. With older cars the theory is that exact match is not so important. It makes economic sense for Nissan (as well as ALL other car companies) to do this wherever they can.

[JedCoop]

After ordering a "no color dot" injector a few times I kept getting what looks like (to my eyes) the exact same injector that Scottsdale sent me! Even when the picture on the web site looked like a match to what I pulled, I still got the other injector. Sheesh.

So I gave up (a while ago) and put one of those purple injectors in my car with the ful intakes down low. As far as I can tell it works just fine!

[maxnix]

The main difference between the early 1990-1993 G50 and later G50 is in the pintle design, which corresponds with a change in the intake design.

The former are a single pintle and the latter are a rotary disc. There was a good link in a previous posts that had pictures that illustrated the difference between the two.

[Q45tech]

Do confuse Bosch - JAPAN [manufacturer of Q injectors] with the entirely different [totally unrelated now] company of the same name, BOSCH-GERMANY and its US distributer BOSCH-USA.......which make somewhat similar injectors but sold the patent license to Japan.