Vacuum lines, Useless Enging bay item ?s

[jmwenick]

I would like to clean up my engine bay and save a little weight at the same time, is there any vacuum lines that can be unplugged? Other Misc. items that can be pulled out? Thanks

[[s3]]

AIV, EGR, carbon canistor....

[niznos]

If you are not using your AC or it dosen't work at all, take it out. It will save you some parasitic power loss and lighten by 60 lbs (don't know first hand about the actual weight, only read on this forum).

[nismojunkie]

what exactly is the EGR and what does it do? what about the carbon canister, i know that does somethign with gas and the retyrn fuel line right? if you took that off woudl it affect gas milage?

[420_240sx]

EGR is Exhaust Gas Recirculation. Basicially it reroutes unburned exhaust back into the intake. Your 240 might spit out some more exhaust, but I have seen cars rev a little quicker, or at least it seemed with the EGR removed. After my friend removed his from the 1991 Honda Accord HEH it did seem a lot quicker, felt like 5-10hp more possibly

[jmwenick]

Anyone have a pic on the egr, is that what connects to to carbon cannister? On the passenger side with all those tubes and pipes?

[89240sx]

the EGR is behind the valve cover, by the firewall...and has a vacuum line on it.... I can get a pic later today maybe tomorrow.

[sil80drifter]

Any carbon canister comments? I'd like to get rid of that piece of plastic from my bay, is it absolutely necessary? I know it collects excess fuel vapor and puts it back into the tank... but... is this a big deal?

sil80

[[s3]]

Any carbon canister comments? I'd like to get rid of that piece of plastic from my bay, is it absolutely necessary? I know it collects excess fuel vapor and puts it back into the tank... but... is this a big deal?

sil80

It collects fumes from the gas tank when your car is at rest and reburns it later when its running.

Removing them might cause a little bit more pollution, and might have problems at the emissions checkpoints, but it gets rid of some vacuum lines which might have cracked during the years.

[jmwenick]

Anyone have any more info on the AIV and maybe a picture of it and the EGR. I know about the carbon canister and I am removing it this weekend. Thanks guys

[89240sx]

Didn't there used to be a sticky walk through for removing the AIV?

[nismojunkie]

http://www.nissaninfiniticlub....26150here is a link it tells you how to remove the AIV and clean it or just leave it off

[nismojunkie]

i think the link i just gave might be that sticky

[sil80drifter]

Oh, so when I open my gas tank to fill up and it goes PSSSHHHH, that means that my canister is not doing the job it should? So removing it wouldn't make a big difference, right?

sil80

[[s3]]

Oh, so when I open my gas tank to fill up and it goes PSSSHHHH, that means that my canister is not doing the job it should? So removing it wouldn't make a big difference, right?

sil80

No, thats just from pressure built up in the gas tank.

Removing the canister wouldn't make a big difference, you might pollute a bit more..but who actually cares about emissions?

[sil80drifter]

I don't get how it would pollute more (not that I care, you're right)

sil80

[[s3]]

I don't get how it would pollute more (not that I care, you're right)

sil80

The carbon canistor collects gas fumes, if you remove it....that sh1t gotta go.....somewhere.

=)

[sil80drifter]

so...where does it go, if I plug all the hoses that used to transport fuel? will my tank blow up? lol

sil80

[eddiec]

so far ive removed the aiv, intake resonators and lately the carbon cannister. haven't driven yet, but i'll let you know if i blow up....

i used vacumm line plugs to cap off all the extra vac lines.

as a side note....... gas in your tank gives off fumes. these fumes are called evaporative emissions. if you notice the price of gas going up, part of that is the different blends of gasoline required in certain regions of the usa. these blends are designed to fight gas evapoating by use of ethanol, mbte or other chemicals. in the summer heat gas evaporates more readily than in colder temps.

so in a way the canister (if working properly) is intended to fix what we are paying extra money for. just a thought.

[sil80drifter]

soooo.... it's outta my engine bay. i blame iraq and bush for high gas prices. not the emissions legislature.

sil80

[2240sx]

So, what exactly controls the engine vacuum? The same vacuum that controls the intake butterflies...I wouldn't want those closed all the time...

[niznos]

Vacuum is controlled by the intake of your engine. When your engine sucks in air for combustion, it's creating vacuum, if you look at all those vacuum lines, they are all on the intake tube and manifold. As the engine spins faster, it breathes in more, making more vacuum, that's what controls a lot of those emissions accessories. For example, you don't want the EGR to put burnt gasses into the intake at idle because it will cause a rough idle, so the vacuum controlled EGR will not open until the engine is putting out more vacuum at mid to high RPM's.

There is no point to remove the evap can as far as I can see except to gain space under the hood. You don't loose any power by breathing in fuel fumes. What do you think the car burns anyway.

[sk8erguy1501]

so basically it isn't worth it to remove anything? but if there is SOMETHING to be removed to gain a little bit that isn't much hassle can you post how to do it with pics? thanks.

[bendychicken]

I remember reading in a previous thread that the ecu needs to be reprogramed if you remove the EGR or it will run rich afterwards. Not sure if this is true or not but worth mentioning

[navysnail]

accually, if anything, it will run lean.

[WAbernethy]

Vacuum is controlled by the intake of your engine. When your engine sucks in air for combustion, it's creating vacuum, if you look at all those vacuum lines, they are all on the intake tube and manifold. As the engine spins faster, it breathes in more, making more vacuum, that's what controls a lot of those emissions accessories. For example, you don't want the EGR to put burnt gasses into the intake at idle because it will cause a rough idle, so the vacuum controlled EGR will not open until the engine is putting out more vacuum at mid to high RPM's.

There is no point to remove the evap can as far as I can see except to gain space under the hood. You don't loose any power by breathing in fuel fumes. What do you think the car burns anyway.

I don't like the way you have this worded. The engine actually creates the most vacuum at idle because the throttle plate is closed and it's sucking air through a little hole. When the engine is revved up, the throttle plate is opened and ambient air pressure enters more easily. The EGR should actually open with less vacuum and close when the vacuum is increased at idle. Here is a shot of my EGR, err.. at least where it used to be. I cut some stainless steel to make a plate for it.

[xxtrizz]

Is there a metal line that connects from the gas tank to the specific area on the carbon canister? If so couldnt you jsut put like a breather filter on that line and somehow add like a rubber putty or something to seal it so that the ectra fumes given offby the gas tank are actually like filtered when they leave the system?

Just an idea. Works on the PCV area on the SR.

[eddiec]

i dont see how the fumes need filtering, but a good idea anyways.

[niznos]

WAbernethy, what you say makes sense, and I stand corrected somewhat. Given what you say is true, then the vacuum after the butterfly is exactly as you say, but there are plenty of vacuum lines before the butterfly, on these your analysis would be false and mine would be correct. Also, once the butterfly is open overall vacuum would still be greater, but perhaps not on a specific vacuum line.

[marshun]

i removed my aiv and it seems to run rich. i can smell the gas from the exhaust.

but since i removed the aiv, does the egr even work now?