New here so first off hello to all! I recently jumped on a truck because got a deal on it 1998 ram 1500 4x4 with 5.9 truck was smoking like a train looked in the intake and seen oil standing so thought I was safe. Snatched the intake put new belly pan gasket and of course intake gaskets pulled the plugs figured they were fouled from the oil..found one ground strap gone. Went ahead put new plugs in and started it to find it still smoking and missing and will pop back into the intake at idle but not if throttled some.....I let it run a little figured the smoking was the old oil in the exhaust but it isn’t I pulled the plug and fresh clean oil is on the plug🙈🙈 I pulled the valve cover and checked to see if the rockers where loose to see if possibly bent a valve everything looked ok ...not sure if the piston has broke rings or how the oil is getting on top of the piston or running past the valve? now open for suggestions please

 

Well, yeah if fresh oil is on the plugs, it's not in good shape. Do a compression test to confirm what you know.

 

The PVC valve may be stuck open. Cap it off and try running it again. Even if it was i doubt you would get that much oil in the intake. It would be wise to do a compression/leakdown test to identify where the oil is coming from.

 

Gonna do a compression test see what I come up with shortly. I just knew the belly pan was gonna fix this jewel right on up lol

 

Did a compression check cylinder in question had “0” the rest was 145/150 pulled the head and found a hole in the top of piston....question is what caused it the oil from the belly pan? How could it run that lean? Computer should catch and correct that right?

 

Spark knock. Otherwise known as pre-ignition. That'll blow holes in pistons quite handily. Likely the blown plenum was a contributor.... oil gets in the combustion chamber, cokes up, and leaves deposits that will be enough to ignite the fuel mixture before the spark plug does.

 

Man it just keeps getting worse lol found a crack in the head also small little crack between the exhaust and intake valves sad part is it only has 130,000 miles on it must have been some hard ones

 

Stock Magnum heads were known to do that, the casting is thin.

 

I think the old truck is worth a engine so o well I reckon lol appreciate everyone’s help👍🏻

 

Pick up a long block from your favorite vendor. Online, or local. Less down time, and actually cheaper than a rebuild. Take care of it, and you will get a LOT more than 130K out of it.