[scoober]

it makes me want to pull my engine immediately and clean and polish the intake ports... hmmm engine stands are on sale for 40 bucks at harbor freight this week....

 

[victoryredzq8]

port n polish the head!

 

[scoober]

that's what I'm saying. I've been reading up on it like crazy, its totally do-able hell you may not even have to remove the engine just losen up the driver's side motor mount and take off the intake manifold, remove the battery and you should have plenty of space but DAMN that'll be killer on your back.

 

[victoryredzq8]

i don't know about that :lol: even with the manifold off there's not a lot of room on the intake side.. you could still pull the head off without pulling the engine though :shrug:

 

[scoober]

that 40 dollar engine stand is looking mighty nice right about now! lol!! I think that'd be saved for a rainy weekend mod tho

 

[Josh@OTTP]

You have to have the head off the engine to port it. Otherwise you will get shit in the engine and you won't be able to port the most important part of the port.

 

[emaxxer]

You have to have the head off the engine to port it. Otherwise you will get shit in the engine and you won't be able to port the most important part of the port.

:true:

Yeah come on guys use your brain.... This isn't a Honda..... :lol:

 

[victoryredzq8]

i got a better idea.. start the engine, rev it up real high then pour sand into your throttle body, easy way to sand blast the intake runners!

 

[scoober]

okay well I guess its time to start part 2! everyone's been talking about it for god knows how long.. we started talking about this shit.. i guess its time to move on to another step?

 

[scoober]

so driving around today I threw a lean code.. nothing's changed, everything's secured.. making me scratch my head.. I'm gonna clean out the filters and see if that has absolutely anything to do with it.

 

[emaxxer]

so driving around today I threw a lean code.. nothing's changed, everything's secured.. making me scratch my head.. I'm gonna clean out the filters and see if that has absolutely anything to do with it.

I bet it's where you have the hose clamped to the hex part of that brass fitting.

 

[Turbizzy]

We don't have an actual PCV valve like most full size GMs since 99, we have a small hole in the valve cover that is a calibrated size to act as a restriction in the pcv system so that your manifold vacuum isn't sucking up tons of crankcase fumes, only small amounts.

We were having issues with the early Colorados and those PCV holes getting plugged up and not allowing the pcv system to work properly thuse allowing moisture to accumilate inside and surface rust the cams. Their fix was a valve cover with a baffle installed near the pcv hole to keep oil from slinging onto it.

 

[emaxxer]

What'd I tell ya! mg:

 

[scoober]

I went through and cleaned everything out today, TB, MAF, the entire filter system(warm water and dish soap for the clear cans, and TB cleaner for the filter stones.. hand dry the tubes and then put a thin layer of petrolium jelly on the o-rings so they dont dry out), did grab some 1/8" seals for those nipples on the fliter, one thing i did do was take a pick and rip off that C clamp on the nipples, then pushed them all the way closed with a screwdriver and put the nipple all the way up, and yeah i did move that hose down, changed the oil and did other stuff.. did reach my hand inside the intake and do a swipe..

its disgusting...

so now its sitting unplugged, gonna go out tomorrow and snoop around for a bit then just going to monitor it.

piktars of the cleaning

 

[DBNissan]

I may pull those c-clips off and push the valves all the way down too. I'm wondering if maybe the way we have, the intake is sucking in too much crankcase air which is unmetered. I might put my AEM hose back on and remove the t-connector and just run the PCV side hose to the filter canisters. Mine has not thrown a CEL yet so we'll see.

 

[emaxxer]

I may pull those c-clips off and push the valves all the way down too. I'm wondering if maybe the way we have, the intake is sucking in too much crankcase air which is unmetered. I might put my AEM hose back on and remove the t-connector and just run the PCV side hose to the filter canisters. Mine has not thrown a CEL yet so we'll see.

Anything after the MAF sensor is metered air or at least supposed to be...... Find the possible leaks and fix them. You will be fine then.

Edit: and as long as all of this is sealed up, it doesnt matter if the intake manifold pulls in more air or breathes better with this setup because the air has already passed the MAF sensor. This only works if you don't have any leaks.

 

[DBNissan]

How is air from the crankcase metered when it doesn't go past the MAF?

I think the issue scoober ran across is the fresh air side of the valve cover is supplying too much crankcase air since it's not restricted like the PCV side of the valve cover.

BTW, nice manicure Steve! :lol:

Man, that looks like a snotty mess!

 

[emaxxer]

How is air from the crankcase metered when it doesn't go past the MAF?

think of the MAF as the bouncer at a bar keeping count of every customer that enters and the air passed the maf and anywhere inside the motor is the number of customers inside the bar. If customers sneak in the back door, it throws the numbers off much like if atmospheric unmetered air seeps into the intake passed the MAF. If the crank case breathes any better (with this setup), it's still not adding any more air into the engine than that has already passed the MAF unless of coarse there is a leak.

 

[DBNissan]

think of the MAF as the bouncer at a bar keeping count of every customer that enters and the air passed the maf and anywhere inside the motor is the number of customers inside the bar. If customers sneak in the back door, it throws the numbers off much like if atmospheric unmetered air seeps into the intake passed the MAF. If the crank case breathes any better (with this setup), it's still not adding any more air into the engine than that has already passed the MAF unless of coarse there is a leak.

I understand how the MAF works. What I don't think we are seeing the same is the air IN the crankcase. The air in the crankcase is blow-by, wouldn't that be additional air volume? Yes, it has gone through the MAF prior to combustion but is then spent by combustion. Does the o2 account for missing air volume? Or is it not enough to set-off the CEL?

I have not set-off the CEL with the same set-up. Just thinking through other possibilities.

 

[emaxxer]

There's no increase in volume but rather with the speed the air moves in and out of the crank case.