Hello, here i am once again with some new issues. Luckily i've been free of problems the last 2 years!

First of all the symptoms :
- Drives well, sometimes drives bad ( loss of power ).
- When starting up it tends to struggle to get above 2000rpm ( sometimes holds in so bad, and starts backfiring) , once it hits above, no more problems untill i turn off the engine.
- drinks alot of oil- grey blue smoke on cold start and while hot.
- temp doesn't overheat at all , stays perfect!
- giving missfires on cyl 5,6,8
- P0132 ( oxygen sensor circuit high voltage )

Some details:
Car is a 2nd gen ram , 5.2l 2x4 from year 2000.
Did the cracked heads get solved trough the production years?
Total of 275k miles. I've replaced the plenum gasket with a fell-pro , and replaced bolts with OEM bolts that i've grinded a bit.
I don't get any oil in coolant or vice versa.
The car drives on LPG aswell ( i'm euro ) it doesn't seem to suffer as much, allthough it isn't fully preforming aswell on LPG.

It's making me think the plenum again, but i'm kinda worried about cracked heads. As the internet is shouting it all over the place.. can't imagine that i'll get cracked heads after 21years of fine preforming?
​​​​​​
does it sound like plenum? Haven't gotten time to check the intake if it soaked or not..

And once again, for peace of my mind, did the cracked heads get fixed throughout production?

Thanks in advance!

 

No cracked heads didn't get fixed throughout the years.

 

Take a look at the spark plugs on cylinders with misfires. The plug will tell you what's going on in the cylinder.
Are you getting any puddles of oil or coolant after you park the truck.
Do you have an auto parts store that can loan you tools for performing compression test or leak down test?
When was your last tune up, plugs, wires, distributor, rotor?

 

It's been about 2-3 years since i've replaced the ignition all along. Right now i can't pull the plugs. I'll do tomorro asap.
my block leaks a bit oil at the back of the engine. It's just a few small drops, and i believe it's a sweaty valve cover..

 

Drinks allot of oil is more than likely your biggest problem. My guess, either, valve stem seals really bad, AND/OR rings shot to boot. O2 sensor is prolly reacting to being drown in oil. You mite also wanna check the exhaust pressure before your cat. Based on the "drinks oil' problem you described, you're cat is more than likely also clogged.

 

Left side , infront of motor all look like this.
Haven't gotten enough time to check the other side 🤣

Took it for a drive , and it's mostly not riding now, barely get at 10miles without any backfires.. sometimes when restarting it's over.

​​​​​​Looked inside my intake, and doens't seem to have some oil in it

 

Also last week i had to go to the technical car control ( whatever you call it ) they measure the reading of the exhaust and my car failed the test.

Co % was 0,60
And my lambda ( o2 sensor ) gave higher then 1.1 readings. It's supposed to be below 1.03 and co % below 0.30

 

How old are your O2 sensors?

 

They're from 2018-2019 i believe,

 

What brand?