Well, again

You need to analyze the voltage and current in the injector waveforms.

 

I have a buddy with a 4WD 98 cherokee could I use his ECU to verify that mine is good?

 

I'll give that a go around the intake, and report back.

 

Okay, I'm buddy with the 4WD 98 had an extra harness so we threw it on really quick and it still runs like crap, so unless It's a bad harness I'm thinking my harness isn't the issue.

 

Specifically, it's still the P0204 code? If it's generalized crap, and you switched a pile of stuff and you haven't reset the PCM you might do that:

https://www.cherokeeforum.com/f2/jee...-46047/index2/

Other than that, IMO PCM is only thing left.

 

1) we know it has a bad idle. How does it run off idle,; like at 3k under load?

2) how long did it sit while you were redoing the engine?

 

okay, I haven't done the reset on the PCM I'll try that next. As for when I swapped out the harness no code popped up but the idle is really rough.

 

I have tried driving it and it sputters and bucks. And when coming out of the throttle at a stop it dies.
It sat for about a week.

 

Just thinking out loud here...
That's more than a 1cylinder problem, you could kill one cylinder and it wouldn't do all that. I wouldn't focus on that one cylinder injector trouble code
Weird that it's that bad and isn't setting more codes.
The idea that the computer happened to decide to take a dump just when you worked on the head etc seems a little unlikely.
I'll assume the cam is timed correctly...

If you pulled the engine to do the work any chance the flex plate got messed up re it's relationship with the crank position sensor?

 

I tried a different PCM and it ran the same. The cam can only be installed one way like the factory cam no option to add or retard timing and the crank and cam gear where lined up dot to dot with the #1 piston at TDC. I didn't pull the engine to do the cam install.

 

Look at live data on your scan tool at temperature, throttle %, map,ignition advance, O2 sensors, and anything else you can think of for something weird going on.... behaving funny or strange numbers.
Gotta be something that got messed up when it was worked on and likely a sensor or control. Strange no consistent codes but maybe that's telling us something, just don't know what.
​Assuming it's not a mechanical issue with the head/cam/rockers it seems like "timing* is off . Plug wires on there in correct order?... That probably wouldn't set a code

 

Do you have any codes now? How many times have you driven it (some codes take more than one cycle to generate)?

Did you follow this advice:

as not finding anything bad does not automatically make it good.

Cam/crank sync absolutely needs to be checked.

Consider purchase of entry-level o-scope (or I can load you mine with a small (ok, massive) security deposit +postage (although based on what you've sunk into this so far an o-scope would be a drop in the bucket)).

Other scanners may be able to do the sync (Autel MK808s, Autel MS906TS, Thinkdiag2). Have to call/research.

 

What advice was that for?

 

Okay, so after looking at Distributor Indexing | cruiser54 I noticed that the rotor contacts are pretty far away from the #1 post, so I gonna do the cruiser54 distributor mod and get it closer.
If that doesn't work I'll try replacing the Crank Position Sensor.

 

Kinda what you're doing now. The camshaft position sensor (inside the distributor) needs to be sync'd with the crankshaft position sensor because

That may occur during indexing; if not, fine tuning is needed.
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