[rdesai]

I have 2002 4.7 ram, The engine locked up yesterday (120K miles).

I wanted to know if there are any motors that can be swapped in without getting to involved.

How easily would a hemi drop-in?

 

[maka]

For a Hemi you would all new everything in there. Drop a newer 4.7 in. A lot easier

 

[jordanp123]

what happened to it ? ran low on oil ?

 

[eatsleepdrivesc]

ya what happened???

 

[rdesai]

not sure yet just had it towed to the shop, but it had plenty of oil and it never ran hot. so i don't really know. just tried to start it up in the morning and could hear it locking up.

 

[eatsleepdrivesc]

well let us know when you figure it out

 

[jordanp123]

Yeah Definitly, ANd more than likely your best bet is to do a 4.7 swap. A 5.7 swap will cost alot more money and time than a 4.7 swap will in your case.

 

[rdesai]

So I got my 4.7 rebuilt, turned out I had a small leak in my head gasket. but now I have a new problem.

I have a misfire in cylinder #1 that started right after I started driving it again. It lasted about a week then it turned in to a random cylinder misfire.
It turned out to be a bad computer. So I replaced it and I ran fine for about 2 weeks.
But couple of days ago it came back. I get a code of P0307, but it feels like its multiple cylinders.

I replaced to injectors, coils and sparkplugs when it was rebuilt.

When I accelerate it runs great, its worst at idle and when im holding a constant speed. the whole truck shakes when at this point feels like I'm on a dirt road.

Any one got any ideas?

 

[nickd907]

it almost sounds like a bad spark plug wire.

did you change those during the rebuild?

 

[rdesai]

no wires, its coil on plug

 

[dodge3471]

So I got my 4.7 rebuilt, turned out I had a small leak in my head gasket. but now I have a new problem.

I have a misfire in cylinder #1 that started right after I started driving it again. It lasted about a week then it turned in to a random cylinder misfire.
It turned out to be a bad computer. So I replaced it and I ran fine for about 2 weeks.
But couple of days ago it came back. I get a code of P0307, but it feels like its multiple cylinders.

I replaced to injectors, coils and sparkplugs when it was rebuilt.

When I accelerate it runs great, its worst at idle and when im holding a constant speed. the whole truck shakes when at this point feels like I'm on a dirt road.

Any one got any ideas?

It sounds like you have a valve that is not sealing or have a scuffed piston or cylinder. Start by getting a quality compression gauge and doing a compression check on all 8 cylinders with the engine as hot as possible and the throttle wide open. Drive it for a while to get the coolant and oil temperatures as hot as possible. Disconnect the crank and cam sensors prior to cranking the engine for the compression test. The crank sensor is on the passenger side rear bottom of the engine block just above the oil pan rail. The cam sensor in on the bottom of the passenger side front cylinder head.

Between the compression readings and a visual inspection of the spark plugs you should be able to narrow down what cylinder is giving you the problem. Once you find out what cylinder is giving you the issue you can better determine what the exact problem is with that cylinder with a cylinder leakage tester or by simply setting the cylinder in question to TDC (top-dead-center) and applying 60-100 psi of air pressure into the spark plug hole and determine where the air is escaping to.

The possibilities are past the intake valve which will be able to be heard by opening the throttle body, past the exhaust valve which can be heard out of the exhaust manifold, or past the piston and rings which can be heard by air escaping from the crankcase, PCV hose, fresh air hose, or dipstick tube.

 

[1MIKE1]

bad battery?

 

[rdesai]

nope battery's good. just dropped it off at the shop again so lets see what happens.