Recent content by tommy54

I swapped a used engine into my 2000 cherokee and it started knocking ten minutes after I fired it up. It's a really weird knock. It comes and goes, and when it shows up the engine runs pretty rough(like it's missing on at least one cylinder). The torque converter to flex plate bolts are...

The little evap solenoid is ticking as well. I traced that one down when I started the jeep up for the first time. This is a much more significant knock when it shows up. The jeep has a misfire now after the knock started. Still no check engine light. It has a constant miss, sounds like one...

I put a used engine in my 2000 cherokee with 4.0/aw4, and it is still doing the same exact thing as the old engine. I bought the jeep with a blown engine, didn't even try to start it until I had it home and off the trailer. I started it up and drove 100 feet and it sputtered, died, then...

Full charge on the battery, and a second fully charged battery hooked up with jumper cables. I also have a load tester and I tested each battery. As the starter was dying today I noticed that it only cranked for 6 or 7 seconds before sounding weak.

Found an engine from a running 99 with all accessories for $250. I think I'll pick it up since the price is right. I know the ignition parts won't work. I'm ready to just pull my motor out tonight and pick the other one up tomorrow. Once you've pulled it once it goes quick the second time...

The cam sensor functions by outputting either 0 volts or 5 volts. It's an on or off sensor. The computer reads the "square wave" created by the on or off voltage and interprets that data to determine the position of the cam. I tested the sensor by probing the back of the connector and...

MCQue, I've done this, at least I think so. There's one part that I don't quite understand. What do they mean to "Rotate oil pump drive back to its original position"? As the assembly drops into the motor it rotates about 90 degrees, then sits flush on the block if the oil pump slot is aligned...

I have a 2500, but I don't have the updates past 1998. Was hoping to find a way to hook it up with what I've got here.

Can a timing light be hooked up to the DIS on 2000+ Cherokees? It would be a bit tricky without plug wires to work with, and I understand that I can't really adjust ignition timing. I really need to see when I'm getting spark in relation to the crank. I tried hooking up an inline tester to...

Yeah, looks like all the lights go on, then go off, like they are supposed to. I think you're right about the tach not working until the engine starts. I just thought maybe I wasn't getting a tach signal(ECU maybe not interpreting crank sensor signal) that I should be getting. Looks like this...

Fuel pressure spikes to 50 when cranking, then drops to 45 and stays there after the key is turned off. Since the motor sort of ran with the blown up cylinder, I tried the old crank sensor. The old crank sensor no longer exhibits the symptoms of a bad sensor(no bus message, volt and fuel...

Thanks Mcque, that settles it. My coil rail is fine. Also ruled out fuel pressure, injectors, TPS, CTS, MAT, and cam sensor. Tried moving the cam sensor out of alignment, got a few hiccups but nothing solid. I pulled the coil rail, put plugs back in the rail, grounded each one with a...

Scratch that, i must have had a loose connection. At least I think so. It all seems fine now. I don't know.

I seem to have intermittent spark at cylinders 3 & 6. Are these run by the same coil in the coil pack? I know that each coil runs a pair of cylinders, but I don't know how they are paired.

Code reader can communicate with the engine, but when it tries to read transmission codes it says that it can't communicate. I know this model has a TCM, so I assumed that it must communicate with a code reader independently from the PCM. Anyway, maybe there is nothing wrong, and the...