2008 Dodge Ram 1500 4.7 L Engine High PCV Pressure after Induction Cleaning

[todd__young]

Hello everyone,

I have a challenging issue that is worthy of attention, its quite a puzzler.

I have a 2008 Dodge Ram 1500 SLT 4.7 L Engine (Flex)

I decided to perform a "redneck" induciton cleaning to improve gas mileage, I performed it using Seafoam, quite a lot of smoke, however, I forgot to perfom one final detail (take the truck on a 20-30 test drive immediately after all the smoke cleared, instead, I let it rest after and started driving it like normal.

within a few days, I got a check engine light indicating a misfire on cylinder 2 P0302, as well as P0300 random multiiple misfires along with a very noticeable shimmy and shudder, with lunging, lurching & dieing when there is new gas in the tank

I've performed the following:

1) new plugs
2) swapped ignition cables (stays on cylinder 2)
3) swapped coil packs (stays on cylinder 2)
4) replaced the cylinder 2 fuel injector (misfire persists)
5) There is now an oil buildup on the AC hose that runs above the fan and goes to the condenser
6) I decided to try the induction cleaning again, so I performed a 2nd induction and this time took it for the test drive (3000-4000 RPMS) (Misfire persists)
7) I decided to check the PCV, made the following troubleshooting and discoveries...
a) the breather valve on the passenger side has little to no suction
b) the breacher valve on the driver side has very noticable suction
c) the PCV hose and valve on the driver side are clear of any obstruction
8) it appears that the carbon / sludge is deeper within the manifold or possibly within the engine

I did perform an oil change and I used liqui-moly engine flush prior to the oil change, I let it run until the the engine was running smooth, however the cylinder 2 mifire persisted after the flush/oil change

I replaced the valve cover gaskets today and checked the baffles for any sludge/obstruction - both were clean

I checked the PCV valve and hose on the driver side, both are clear

What should I do next?

1) try another engine flush
2) removed the manifold and clean it?

or

3) is this something that needs to be addressed by tearing down the engine and going deeper?

I appreciate any feedback

Thank you in advance

Certainly is a head scratcher

 

[todd__young]

Oh yeah,

I've checked compression on cylinder 2 - 153 PSI

I'm seeing something about internal "Crankcase ventilation pathways" these are inside the valve cover/engine and they can be cleared with compression or 12" - 24" nylon brush

apparently I shouldve run liqui-moly engine flush FIRST, then performed an induction cleaning

 

[todd__young]

I'm not getting any codes on the 02 sensors

I removed the PCV valve on the drivers side valve cover, and checked to see if there is any pressure coming out of the port

There is NO pressure coming from the port, meaning that there is some kind of blockage internal to the engine

Gases are not even making their way to the PCV Valve, they are staying in the crankcase building pressure

How do I clear this without taking the engine apart?

 

[Sherman Bird]

I'm not getting any codes on the 02 sensors

I removed the PCV valve on the drivers side valve cover, and checked to see if there is any pressure coming out of the port

There is NO pressure coming from the port, meaning that there is some kind of blockage internal to the engine

Gases are not even making their way to the PCV Valve, they are staying in the crankcase building pressure

How do I clear this without taking the engine apart?

A good Doctor would go up the tailpipe!

 

[billyray59]

Did you ever figure this out? I'd be interested to know where you are at with this. How many miles on the engine?