4.7 Engine swap help please

[Cj3679]

I have an 02 Dodge Ram 1500 4.7 I put a 4.7 engine from a 04 Jeep Grand Cherokee but I'm having trouble with it running right .it cranks and drives but doesnt Idol right and jumps and stutters every now and then ....the dealership said I need to get an ECM from the 04 Cherokee to get the truck to run right.....CAN ANYBODY HELP ME? ????

 

[HemiLonestar]

Your donor 04 engine has the wrong crank tone wheel to match up with your PCM. Your options here are either find another 02 engine, or transfer the 02's crank wheel to the 04 engine (this requires crank removal). Pretty sure you can't just plug in the 04 PCM and everything works.

 

[Cj3679]

The truck cranks just fine. ..just runs a little sloppy and keeps throwing injector codes which has already been replaced. ..

 

[Cj3679]

When I did research everything had the same specs

 

[hotkarl]

What happened to the original engine? Did that run good before you had to replace it? Maybe you messed up on something installing the new one? Loose connection or something? I would recheck everything you disconnected to do the swap.

 

[Cj3679]

The old engine is a long story. .but it ended with alot of metal in the oil pan.....when I got a diagnostics test done they said nothing was communicating and they couldn't even do the test? ????

 

[hotkarl]

So it runs rough and the CEL is not on?
No codes?

 

[justin13703]

The truck cranks just fine. ..just runs a little sloppy and keeps throwing injector codes which has already been replaced. ..

The crank tone wheel will cause running issues if your original engine had a 16 tooth wheel and your new one has a 32 tooth wheel. It doesn't cause cranking issues, it causes running issues.

 

[Cj3679]

Both engines are a 16 tooth....and yes. ..is throwing injector codes. ...random every time I reset the computer...and sometimes a low high voltage? ???

 

[hotkarl]

Ok, so you have a little troubleshooting to do. At least you have a starting point. Maybe someone can chime in, fuel system is not one of my strong point.