installing headers eventually
EGR pipe was a cinch
AIV pipe is fused. Cats frozen solid too. Soaked it with liquid wrench got a good grip on it with a wrench and it stripped.
Fortunately that was practice on the blown motor. But I need to remove the exhaust sytem either way. I'm anticipating the same situation on the good one.
I'l try a penetrating oil but I'm not counting on it.
ugh! Suggestions welcome because I'm 2 steps removed from bustin out the sawzall and chopping the exhaust system into sections.
AIV pipe
Are you wanting to reuse the AIV or just want it out completely? If you just want it out, regardless of its condition afterwards, then either cut it out or use the old vise-grips. If you need a plug on the manifold/ header for after it's gone the Nissan number is 14052-21R00. I had a hard time getting that part number since the dealer parts guys are not prone to give it out. Expect to pay around $10. I used to have the nickels in there, but the seal isn't as good.
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Dattebayo
- Posts: 33288
- Joined: Sun Aug 25, 2002 10:04 am
- Car: 2004 Nissan Frontier Desert Runner
- Location: NE DC
Why is it that the http://www.240sx.org site tells people to not remove the AIV? Whats the worst that could happen if you remove it? ANyone who has done it in the past?
Good question. Ive been through the article and I still dont have a clear answer.
Seems like all it does is pipe air to the exhaust manifold or not to help the catalytic convertor warm up. Might affect backpressure. Apparently it prevents backfiring if you have a hi-flow exhaust. If I remember correctly it affects hydrocarbon emissions on start up. I suppose they arent in a position to advise people to pollute more.
Damn had to read it like 3 times
Seems like all it does is pipe air to the exhaust manifold or not to help the catalytic convertor warm up. Might affect backpressure. Apparently it prevents backfiring if you have a hi-flow exhaust. If I remember correctly it affects hydrocarbon emissions on start up. I suppose they arent in a position to advise people to pollute more.
Damn had to read it like 3 times
Missing AIV's may fail (visual) emissions/inspections, that may be why no one wants to openly advise you to take it out.
As far as it failing the actual tailpipe test, I don't think that it would, becuase some years didn't come with one in stock form, and I don't think tests for tailpipe emissions are conducted while the car is cold, right? If all tests are taken when at operating temp. then (in theory) all 240s without AIV's would test the same, regardless of if it has been removed, or never had one from the factory.
Mine has been gone for months now, and I can't tell a differnce in the way it runs (actually, it runs better since mine was letting some back flow through), and since I don't have emissions tests here, I can't say for sure what the actual count is coming out of the tailpipe.
As far as it failing the actual tailpipe test, I don't think that it would, becuase some years didn't come with one in stock form, and I don't think tests for tailpipe emissions are conducted while the car is cold, right? If all tests are taken when at operating temp. then (in theory) all 240s without AIV's would test the same, regardless of if it has been removed, or never had one from the factory.
Mine has been gone for months now, and I can't tell a differnce in the way it runs (actually, it runs better since mine was letting some back flow through), and since I don't have emissions tests here, I can't say for sure what the actual count is coming out of the tailpipe.
hmmm...
the sohc I'm swapping seems to have been runing with the vacuum lines disconnected from the AIV solenoid for 2 years.
this is most distressing
what does that mean? were the reed valves open piping exhaust into the intake? were they closed? Are the vacuum lines all gunked up?
AAAAAARRRRRRRGGGGGHHHHHHH!!!!!!!!!!???????
the sohc I'm swapping seems to have been runing with the vacuum lines disconnected from the AIV solenoid for 2 years.
this is most distressing
what does that mean? were the reed valves open piping exhaust into the intake? were they closed? Are the vacuum lines all gunked up?
AAAAAARRRRRRRGGGGGHHHHHHH!!!!!!!!!!???????
gumby wrote:Props to niznos for the plug #.
Your welcome, glad to help.
As far as the AIV vac. lines being disconnected. If they were left open to the atmosphere, then you've had a big vacuum leak for a while, and have been breathing lots of unfiltered air. You will need a good intake/combustion chamber cleaning. The old Seafoam should help. And reconnect them if you want.
If they were disconnected but plugged with something, then it has the same effect as if it was removed altogether. If the AIV is disabled via disconnecting the vacuum lines or wire harness, or both, it will stay in the closed position. So no worries there.
The AIV is designed to let filtered intake air into the exhaust, not the other way around. When it malfuncitons, then it does the opposite and needs to removed/repaired/replaced.
My personal advise is to get it out if you are not subject to testing. Not much need for it.
You never said if it was disconnected and plugged or not. If it was plugged, then it would not function and no adverse effect is felt at all.
If it was diconnected and left open, then you need to:-plug the lines up while leaving it disconnected, -remove the AIV entirely and plug everyting, -or reconnect it all back to normal and repair the AIV if needed.
Do not leave it disconnected and unplugged because you are taking in unfiltered air that will dirty stuff up, and since the extra intake is not metered by the MAFS, your overall running characteristics would suffer.
I can't imagine any big problems with the crankcase in any of the cases though.
If it was diconnected and left open, then you need to:-plug the lines up while leaving it disconnected, -remove the AIV entirely and plug everyting, -or reconnect it all back to normal and repair the AIV if needed.
Do not leave it disconnected and unplugged because you are taking in unfiltered air that will dirty stuff up, and since the extra intake is not metered by the MAFS, your overall running characteristics would suffer.
I can't imagine any big problems with the crankcase in any of the cases though.