Bypass vacuum hose port? P0401

[95Fantasma80]

Why couldn't we just bypass and not have the hose go trough the intake where it builds carbon and makes it get clogged. Is there something in there while passing trough the intake that happens preventing us from doing this?

I am about to clean that clogged port that everyone recommends drilling into because it gets clogged, Mine is clogged really bad! but was wondering why not just bypass and save us the headache of it ever happening again.

What are your thoughts I think I've seen it mentioned before, or would it be best to stick OEM and not bypass and trust Mr. T did this for a reason.


These are not my pictures, credit to mud members. I only added the arrows and words.

 

[LexissLX470]

If you try to by pass it you'll have another tube running from the top of the engine down under the plenum, it doesn't really serve any purpose besides keeping the engine bay clean and neat.


I still drilled out mine when it was clogged but next time I might just bypass it

also keep in mind that anything you use will still build up gunk and eventually clog, you just have to pick your poison

 

[Ebag333]

I just disabled my EGR system.

 

[95Fantasma80]

Awesome! But I live in the beautiful state of California.

 

[Flank]

Really don't know why you could not go straight from the VSV to the EGR valve with a tube, after having mine out. Only thing I can think of as a reason why it was routed through the plenum would be to possibly heat the air in the vacuum tube?

Keep in mind if you want to re-route, however, that if everything is running well, your engine lasted probably >150k miles before it clogged, so if you clear it and change your vacuum hoses out, it will most likely be a LONG time before there is an issue again. This begs the question whether or not its worth it.

 

[95Fantasma80]

Really don't know why you could not go straight from the VSV to the EGR valve with a tube, after having mine out. Only thing I can think of as a reason why it was routed through the plenum would be to possibly heat the air in the vacuum tube?

Keep in mind if you want to re-route, however, that if everything is running well, your engine lasted probably >150k miles before it clogged, so if you clear it and change your vacuum hoses out, it will most likely be a LONG time before there is an issue again. This begs the question whether or not its worth it.

Very true....

Today I am unclogging it, and doing it how Mr. T had it. It was just a thought while I was in there checking it out before I work on it.

 

[edog's 80]

So are these fixes all based on the assumption that the P0401 is caused by carbon buildup? I would be concerned the the P0401 is due to the VSV for EGR being bad (which is probably the case) and then the re-routing would not matter because you are still involving the VSV in the re-route.

 

[95Fantasma80]

So are these fixes all based on the assumption that the P0401 is caused by carbon buildup? I would be concerned the the P0401 is due to the VSV for EGR being bad (which is probably the case) and then the re-routing would not matter because you are still involving the VSV in the re-route.

The causes for P0401 are always consistently inconsistent like Dan likes to put it.

Carbon build up removal has fixed the code for some, VSV, EGR for others ETC ETC.

I just bypassed it, the port was to clogged for the drill bit to go trough it.

I will give it another try later but for now its bypassed.