BlueRidgeMark

Yes indeedy I do!




I'm thinking a cracked head would show with a leakdown test.

I don't remember if we covered this, but some of the auto stores will "rent" tools for free. Basically, you buy the tool at full price, use it, and take it back for a full refund. If you never take it back, well, they racked up a sale. If you do, it's ready for the next customer.

the_toxic_hotdog

well i am still only getting the misfire on cylinder 1. I check the wiring with the noid light, it failed the first time, and i thought that was my problem. 2 days after i had time to work on it, tested the wire again and.......it works. Theres pulse. Now I am totally lost. No vacuum leak, compression is good, changed coil, plugs, injectors, im thinking next step is take the head off and see........anyone have suggestions? I am open to anything right now..

BlueRidgeMark

Have you tried a new plug wire to that one? Sounds like it may be intermittent. That can be a bear to run down.

If that's good, I'm thinking you may be right about pulling the head. I'd pull the valve cover first just to see if you can spot anything obvious. Run the engine with the cover off (yes, messy) and watch teh valve action.

the_toxic_hotdog

I dont have plug wires, I have a coil pack.

Earlier today after my commute to class, I checked the injector wire with the noid light again and it didn't work......I am officially confused.

BlueRidgeMark

Intermittents will drive you crazy. I'd try finding both ends of that wire and putting in a temp jumper.

the_toxic_hotdog

I'm hoping that it's just electrical and nothing is actually wrong with the engine/cylinder.

the_toxic_hotdog

The issue is that its a dead miss, but the wire sometimes passes and fails the noid light test so I dont know

the_toxic_hotdog

Okay, heres where I stand right now. The jeep is constantly misfiring (cylinder 1). When I plug in the noid light to test the injector wire, it sometimes works and sometimes doesnt, but when it works, its still misfiring, so i'm not sure if there is something up with the computer or wire? I swapped injectors and nothing happened so I know the injector is good. After a drive when I test the wire it usually doesnt work (it has worked a few times though) and when it is working I can just stand there and sometimes it eventually turns off. I don't know what to do and its been 3 weeks now, someone please jump in and help me out before I pull the head off or valve cover

BlueRidgeMark

Okay, one of us is thoroughly confused, and it might even be me.

What do you mean when you say the wire "works" or doesn't "work"? What exactly is happening, or not happening?


What turns off? The engine? The wire? The noid light?

I'm trying to understand why intermittent function of the wire to the injector would have you thinking about pulling the valve cover or head....

the_toxic_hotdog

sure let me try to be clearer, i apologize. Noid light is a tiny light with the same connectors as the injector that you plug into the connector in place of the injector to make sure that its getting pulse or not. When I plug it in, the light turns on, meaning its getting pulse and all is good, and sometimes it's off, which means no pulse. However, regardless of pulse or not, its constantly misfiring. When I say turns off, I was referring to the noid light (no pulse)

BlueRidgeMark

Okay, that's what I thought, but it wasn't really clear.

So, your problem is not under the valve cover, and it's not under the head.

You have an intermittent electrical problem. Focus on that.

If you get that 100% fixed, and there is still a problem, then it's time to start talking about pulling the valve cover or the head.

It's either the wiring harness leading to injector #1 (very likely) or it's the ECM.

the_toxic_hotdog

Right, but my question was that even with this intermittent problem, the misfire is constant regardless of pulse or not. What do you think about that? Because I haven't got a clue

BlueRidgeMark

It's like peeling an onion. You take it one layer at a time. Solve the electrical problem. Forget about the other for now. Set it completely aside. Clear your mind of it.

Once you have the electrical problem solved, you may find that the electrical problem only gave the appearance of the other problem.

OR, it may be a real problem which will be easier to solve once you have the electrical problem solved.

the_toxic_hotdog

Yeah, I guess my only concern now is, if the computer is detecting a misfire and it is cutting power to that injector? Don't even know if possible

Will get crackin' tomorrow and update you

the_toxic_hotdog

Got a compression test, low on cylinder 1 and I don't know what the next step is