Sup guys. Few years back i posted about some issues. Turned out i had a blown plenum gasket.

Now recently i had a ****load of blue smoke. And this year i didn't pass the yearly inspection , due to emission tests! Stupid Belgium!

My CO was 0.7 and o2 sensor readed out 1.04-5
To pass my emission i need a CO below 0.3 and sensor needs to read 1.03 or lower.

Now the tons of blue smoke made me think it's the plenum! I checked through the throttlebody, and saw an oiled intake manifold.

So last weekend , we took it out , and wasn't the plenum this time! But i've noticed the vac line input of PCV , was all oil.

Now, my first question is : could that really cause the tons of blue smoke? And oil to pool up in my intake manifold?
Or the pooled up oil, could it come from the valve seals?

As well i'm having some issues with my driving now. It's like it's like 2 sparkplugs got swapped. Low RPM i don't really feel it, unless the car is running on Temp, then i notice it a lil. But as soon i'm hitting 1500RPM, it drives for ****. Hearing a vacuum sound.. already checked all vac lines, seems to be fine.. sprayed them with some brake cleaner, didn't notice anything. Now i'm wondering if i couldn've broken one of the throttle body sensors , while cleaning it? Going to tear that

back out tomorrow and check if i notice something.

Intake manifold torqued down to spec. So shouldn't be leaking there... As soon i hit throttle , vacuum noise..

Thanks in advance guys 💪
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Valve seals won't put oil in the plenum. That's gonna be the gasket, or the PCV system. If the PCV valve is stuck open, it will indeed suck oil into the intake. Doesn't take a lot of oil to make a LOT of smoke.

O2 sensor should be reading between zero, and 1 volt. If it goes significantly higher than that, that's a bad sensor, or a wiring issue. (NTK or Denso sensors only please. Bosch sensors simply don't work very well on these trucks.)

 

Does the brake booster seem to work normally? PCV could definitley cause some issues, wouldn't hurt to check it out or just flat replace it with the trucks ages, they're cheap. Valve seals could cause blue smoke but it would not put oil in the intake plenum

 

Took back off the throttlebody yesterday. Must have had somewhere a leak around there. The vacuum sound is gone now. But still, car performs badly. Not sure what could be going on..

Will check the O2 plugs, but it's verry wierd that it drives **** right after i did the intake manifold.

​​​​​​Everything is connected as it should be..
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Does it run bad right away, or only after it has warmed up a bit? Are you getting any codes??

 

It gets worse when on temp.
Cool, it drives reasonable but noticeable as well.

Now, i've replaced rotor, rotorcap and plug wires a few weeks ago. And the more i'm thinking of it, the more i'm believing it's ignition related.

Checked sparkplugs today, cyl 8 was wet with oil, guess that's due to the oil puddle in my intake manifold i had.

Going to check rotorcap etc tomorrow. Might've screwed itself a bit loose maybe? Can't imagine it breaking.. or perhaps while working on the car, we hit one of the plug wires maybe? So that'll be the checks for tomorrow. Going to put the old ones back in. Ran good with that for sure.

I do have large evap leak code , p0455 i believe. But have had this through it's lifecycle.

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Verify your firing order as well..... I had a couple wires switched, and it drove fine, till it hit O/D, Then I thought the truck was going to shake itself apart....

Are you getting blue smoke? Or black??

 

Blue smoke issue seems to be getting better with the new pcv valve. Still a little blue smoke, but 100 times better so far.

My issue remains the same, the car drives but misfires.
I've replaced my old rotor and cap. Sparkplug wires, checked the plugs and all is fine.


These are my codes beeing thrown.

Checked all vacuum lines, seems to be fine. Sprayed with brake cleaner etc.

Could it be that my intake manifold itself is leaking air into the system? Not the plenum, but the seal on the heads?
But guess it would be related to one side of the engine. And not cyl 5 and 8 alone?


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You may want to fix the P0445, When the plenum gasket leaks it confuses the computer and you will get misfire codes. Since the evap port is using the plenum vacuum it still may be confusing the computer. The port is on the front of the tb passenger side down the bottom. You can cap the port to test it but don't just leave it that way. Without the evap system working you will build pressure in the gas tank. The gas cap is sealed and does not have a vent. The evap system is supposed to take care of that. Also what plugs are you using?

 

I'm 100% sure the plenum isn't the issue. I took off the manifold to fix it. It wasn't leaking at all. I had a faulty PCV valve sucking oil in.

Now, while taking off the intake manifold, i believe to have broken an vac line. I haven't found the issue so far.

This morning i've stopped at an local garage. Got their fog machine with me. Will test all vac lines tomorrow/saterday.

Now if it isn't an vac line. It must be an electrical connection that is faulty?

Intake manifold torqued down to spec. No leaks i assume from there..

Not sure on the plugs. Would have to take one out. But can't imagine plugs going bad, cause i took out the intake manifold...