The engine is is mix between 89 parts and 95, but 90% of it being 95, I am pretty sure its OBD1?

The three newest injectors have the numbers: 621023 on one side and: D3800AA on the other

whereas the old ones have 5303034 on one side, and something I couldn't read on the other

 

Old ones: http://www.hengney.com/product-143.html

and this is all I could find that matches your description for the other ones

https://www.cherokeeforum.com/f2/los...number-133021/

What's the fuel system? Renix or OBD-I?

 

OP, the members are doing the best we can to help you but keep in mind when you have a wide mix of mis-matched parts from various years, it makes it harder for us to pinpoint the problem as easier.

 

Very true.

 

I understand that, I am just listing all the things I have found. the fuel sytem is (should be) composed of just 95 parts, so obd1. I wasn't there when the swap was done 10 plus years ago, but from what I have seen on it, it seems that most of the engine is composed 95 parts, but some you can tell are from the 89 engine.

new injectors


old injectors

 

First photo:

See that kinked vacuum hose to the fuel pressure regulator?

That regulator thinks you've got low vacuum, therefore increasing the fuel pressure at all times, including idle.

 

Exactly. Now along with fixing that, try all six of the same style of injector to help rule out any more fuel issues.

 

Alright, I will get 6 new cherokee injectors, it will be a while though, its not exactly in my budget at this time. But as for the kinked hose, it was kinked like that for the picture, I pulled it back to get the camera in there, normally its not kinked. Though I am fairly certain there is a vacuum leak somewhere, I will have to check into that, not sure where it could be though, I rerouted and replaced most of the lines, they were plugged into random ports and didn't have the correct size hoses. I am also going to take the valve cover off and clean it up in there, and replace the gasket, I read somewhere that doing that will help with fixing blowbly.

Thanks for all your help.

 

No problem. Another good reason we suggested changing all the injectores is that some may be leaking/stuck causing excessive fuel leakage.
If intent on upgrading your injectors, there is a vast amount of members here running Dodge Neon injectors. They allow for a better spray pattern and bettor atomization of the fuel. The only reason I run the LT1 Corvette injectors is to offset my larger displacement/bore. Your engine may be mismatched but is otherwise stock so larger is not always better in all cases. Here's a helpful link for ya https://www.cherokeeforum.com/showth...149&styleid=15

 

thanks, I will check that out, also, I thnink my seals might be going bad, getting some pretty bad blowby in the past few days, enough to make the engine want to die. but only when under stress such as off roading.

could simply sitting for 4-5 years cause the problems I have been getting?

 

Yes, seals will dry up, harden and crack after sitting for that long. Same thing for gaskets as well.

 

thats what I though, its been very slowly and only somewhat noticable, but I think it is gradually getting worse, less power, and worse MPG. I will replace the seals when I get a chance.

 

just had a thought, could the PCV (or was it CCV?) valve be bad? would it cause the lack of power and excessive fuel consumption, as well as have gas in the oil?

 

No.

 

Ok, I was just wondering.

I will do a compression test hopefully tomorrow and post the results.