Download the 01 FSM from the FAQ/DIY section and get a Haynes manual. They both explain how to do a compression test properly. You should have both anyway.

 

pulled the throttle body out look with a flash light i see some wet spots very light ,
about in three places but not major .

if you read here
https://dodgeforum.com/forum/2nd-gen...ml#post2727576
first post,problem 2:
"""at 40-to-70 miles per hour ,and i go on the freeway and the truck let say it goes with 65mph
and if i press just a little the gas pedal the truck starts shacking ,for some reason,but if i press from the first harder on the gas pedal then i dont notice that shacking anymore."""

i still think my problem may not be from leaking plenum gasket,i may think is from crank sensor ,or maybe , engine was rebuild about 4-5 years ago,and the guys from that shop never did a "fuel sync reset" ?! or even maybe inside distributor that electronic part,

fuel pressure check okay,
cylinder pressure test ,i check a year ago and it was from 140-150

oh, i am lost with this truck,whats to do next,maybe just take it in and have it diagnose by a shop with one of those special machines...


thanks

 

110 psi or lower and the engine is worn out...

My 5.9 the compression test yeilded 150psi dry, 155psi with oil on cylinder #2, and the rest of them were at 160psi dry and 165psi with oil. From what i dug up a Magnum engine that is new has compression around 170psi. Mine is pretty damn close and is probably why my blowby is so low at idle only my arm hairs can barely feal it.

 

Im working on mine today I have a few questions...how do I safely remove the fuel lines&also did you guys remove your plug wires?&last by the thermostat theres two electrical plugs looks like you have to stick something in there to remove em.Is that right?Thanks in advance.

 

when you say
""150psi dry, 155psi with oil on cylinder #2""

150psi on dry ,is that just plug the tester and turn the engine about 5 times and read the psi?
and
the 155 psi with oil!? ,you put some oil somewhere or? sorry ,i never done before like this...

thanks

 

That's pretty much it, yep. After the dry test, you put like a teaspoonful of oil into the cylinder, and run the test again. If it comes up significantly, (15% or more) rings are toast. Not the case for this example.

 

thank you friend,for that explanation.
will do the test soon,to see what will come out.

thanks,
regards,
bosanci28

 

I dont turn the engine 5 times tho, i crank it until pressure stops building. Could be 5 times could be 6 times ect.. Just turn the gauge so you can see it and stop cranking once the pressure stops going up.

Get a syringe or something, take about 1 cc of oil and squirt it into the cylinder then crank it again. As he said if the reading goes way up the rings are worn out. So if my reading of 150psi were to go to like 170psi then i could have a ring problem. But 5 psi is nothing. Oh and make sure you unplugg your ignition coil from the wire on the bottom of the coil which supplies its power. Dont unplug the coil from the spark plug wire, or you will cause arching and it could cause problems during cranking.

Dont ask me how i know that :P Lets just say i had a funny light show

Oh and another thing i heared is you can use this to check for a bad head gasket, or cracked head. Unplug all the spark plugs when you do the compression check, if 2 cylinders are low that are right next to each other, plug one of the spark plugs back in on one cylinder and try the test again if the PSI goes up, you could have a crack, or the gasket could be bad between those 2 cylinders

 

A 95? I'm also willing to bet, as GDstock replied in another one of your many other post's, that your gasket is blown. Simple as that. Stop kidding yourself. Fix the damn thing . And replace the cat, o2 and pcv. It's not like some blow and some don't. They ALL eventually do. So at least eliminate it as "the most common problem" a Dodge Ram Magnum motor has.

 

yap,you right
i think that will be my next project on the truck by fixing that.

thanks
regards,
bosanci28