New Injectors

[B192734]

Hello everyone. I'm new here, so I have to start out with a "Hello"!

I am looking at replacing the injectors on my 2000 XJ, and have never changed an injector before. I wanted to know if they were a part that you had to adjust or anything. Do you have to do something other than just put them in and start it up? Will the computer automatically recognize them and adjust to run properly, or do I need to do something to them? Thanks for any information, and everyone have a great rest of your day!

 

[old_man]

Stupid question.....Why are you wanting to replace your injectors? Running a can of BG44k through the gas will clean them like new. Injectors will routinely last 200k+ miles.

 

[B192734]

I will try that first I think then. I was looking at replacing them because I am slowly going through and trying to replace parts that are starting to get old. Jeep's got about 110K on it, so theoretically they should be good for a while then. I am just trying to work towards restoring a little lost power, and get everything in good running order (not that it doesn't run moderately well right now). Just a little more in depth preventative maintenance.

 

[JNickel101]

110k? That jeep's just getting broken in!

New plugs and possibly a new coil pack rail will help - 2000's love the NGK V-power copper plugs.

 

[B192734]

Yeah. I am just trying to make sure that she keeps running well. No point in letting her get into bad shape. Got some plans for her coming up pretty quickly, and want her to run well.

 

[RichP]

As suggested, the cleaner will do a good job then a 20oz can of Chevron Techron FUEL SYSTEM CLEANER every 5000mi will keep it in good shape.
Do all the fluids, ALL OF THEM, and use distilled water when you make up your 50/50 mix of coolant.

 

[sjx40250]

Get the Blue Line cap and rotor with Brass parts instead of AL. I think Baxters has them.
Look at your casting number on your head. I think it is around the #4 cylinder on the drivers side by the valve cover. If it is 0331, then start watching your oil for water. They tend to crack leading to some performance issues!

 

[weebur]

Hello everyone. I'm new here, so I have to start out with a "Hello"!

I am looking at replacing the injectors on my 2000 XJ, and have never changed an injector before. I wanted to know if they were a part that you had to adjust or anything. Do you have to do something other than just put them in and start it up? Will the computer automatically recognize them and adjust to run properly, or do I need to do something to them? Thanks for any information, and everyone have a great rest of your day!

Well, to answer your question, all you have to do is replace them, no adjustments, etc. is necessary. Just make sure that the recesses in the intake manifold and the fuel rail are very clean and lubed with motor oil before you push them in. If you end up replacing less than all of the injectors replace all of the O-Rings. O'Reilly's has them cheap.

You might check the terminals with a multi-meter. I believe that there should be about 8-12 ohms of resistance across the terminals.

Although I'm not a big fan of AutoZone they do offer a redesigned injector for about $15 or so more than the stock injectors. I don't know why they were redesigned but it could have something to do with the Heat Soak issue.

 

[RichP]

Well, to answer your question, all you have to do is replace them, no adjustments, etc. is necessary. Just make sure that the recesses in the intake manifold and the fuel rail are very clean and lubed with motor oil before you push them in. If you end up replacing less than all of the injectors replace all of the O-Rings. O'Reilly's has them cheap.

You might check the terminals with a multi-meter. I believe that there should be about 8-12 ohms of resistance across the terminals.

Although I'm not a big fan of AutoZone they do offer a redesigned injector for about $15 or so more than the stock injectors. I don't know why they were redesigned but it could have something to do with the Heat Soak issue.

I thought that either gasoline or Vaseline were the preferred lubricants for the O rings ? Not motor oil.

 

[weebur]

I thought that either gasoline or Vaseline were the preferred lubricants for the O rings ? Not motor oil.

I'm fairly sure the FSM recommened motor oil, but I'll check and if different I will repost.

 

[weebur]

I thought that either gasoline or Vaseline were the preferred lubricants for the O rings ? Not motor oil.

I checked the FSM and it says, "Apply a small amount of engine oil to the injector O-Rings. This will aid in the installation." Actually I wish I'd used Vaseline as the recess in my intake manifold at #3 was bored too big at the factory (I believe) as the new injector/O-Ring was a lot easier to install and #3 plug insulator is white (lean).