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  #1  
Old 07-22-2013, 11:20 AM
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First Time Jeep Owner. 4.7L Paternity Test?

So, I just got me a fancy 2000 Grand Cherokee Limited!
White exterior, black leather interior.
Odometer reading just over 200k
The paint is original(sans the hood, which I'll explain in a minute) and immaculate.
I've done some reading on Grand Cherokees and this one doesn't seem to suffer from most of the common issues. No electrical problems(even the dual climate control is working).

The previous owner had the engine blow around 140k and had an engine swapped in from truck(they think). It is a 4.7, but beyond that, I don't know much about it.

They said that it hasn't run right since the swap. It has ignition issues sometimes and other times it works perfectly. They'd taken it to the Jeep Dealership three times for the ignition issue and every time, it would run well for the dealership. But now, fairly consistently, only 5 of the 8 cylinders run right.

I took it to a backyard mechanic who changed all of the plugs and ignitors, then drove it without latching the hood. And guess what happened, the hood flew up and wrinkled. I wanted to kill the guy, but he bought another hood paid to have it painted.

Needless to say, he didn't fix the issue with the misfires and I didn't want him to have my Jeep anymore. I can't remember which 3 cylinders have issues off the top of my head, but it was the same cylinders misfiring, before and after he worked on it. I think it was cylinders 3, 5, and 6.

I think my next path is injectors, but before I burn any bigger of a hole in my wallet, could this have anything to do with the swapped engine fighting with the computer?

If so, how could I find out the origin of the current engine and what would be the best path take to fix it?

Thanks so much for any help!

Here it is after cleaning some of the old dirt off. It still needs to be polished.

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  #2  
Old 07-22-2013, 12:20 PM
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Re: First Time Jeep Owner. 4.7L Paternity Test?

Welcome to the garage.
Did you check for fault codes and which one you have. (ignition switch off/on three times and leave in on at the third time. Odometer will show DONE or any fault code.
When engine and PCM are not compatible, the engine will normally not even start. I would check all connectors and wiring in t he engine bay.
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Old 07-22-2013, 05:23 PM
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Re: First Time Jeep Owner. 4.7L Paternity Test?

Quote:
Originally Posted by Frango100 View Post
Welcome to the garage.
Did you check for fault codes and which one you have. (ignition switch off/on three times and leave in on at the third time. Odometer will show DONE or any fault code.
When engine and PCM are not compatible, the engine will normally not even start. I would check all connectors and wiring in t he engine bay.
Hey, thanks!

Yeah, I'm at work now so I can't check the codes yet, but they were originally showing misfire in those three cylinders(before being taken to the mechanic). He has a snap-on MT2500 scanner and he said that it is now showing injector problems on the same three cylinders.

The engine does run and it is a 4.7L. I thought that maybe the PCM programming varied slightly between the different vehicles that have the 4.7 installed. Because the PCM in it right now is the Jeep's. It wasn't changed with the engine.

I just wanted to ensure that there weren't known PCM compatibility issues with 4.7 swaps before I spend a pretty penny on the injectors. But I feel better knowing that it probably wouldn't start if was a compatibility issue. Because it starts up immediately right now. It just runs very rough because of those 3 bum cylinders.

Also, are the gas-charged cylinders a known problem? The two in the back were totally seized and the hood and rear window lifts no longer have any lift. I'm gonna have to buy a full set!
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Old 07-22-2013, 05:49 PM
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Re: First Time Jeep Owner. 4.7L Paternity Test?

Yes, the gas charged actuators are well known to fail, normally first from the hood and the rest later.
To be sure the injectors are the problem, you could swap them with an other position and see if the fault follows. When the fault codes only tell about misfires, then it could be fuel related, but also ignition. I would also check all connectors on the PCM, the wire bundles and the connectors on the ignitor coils.
Don't know if it could be related to this problem, but check also if the two ground wires are connected to both aft cylinder ignition coils (cylinder 7 and 8). These wires are well known to be forgotten after replacing the plugs.
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Old 07-27-2013, 01:19 AM
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Re: First Time Jeep Owner. 4.7L Paternity Test?

Welcome to JeepGarage|
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Old 07-27-2013, 10:35 PM
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Re: First Time Jeep Owner. 4.7L Paternity Test?

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