Currently I am running a complete (UIM, LIM, injectors, rails, throttle body, etc) from a 5th gen. I originally had a 5th gen IACV that was not willing to cooperate so I used a 4th gen IACV.

Heres the problem:

If I use the 4th gen IACV, I have a cold start issue where the car will stall unless i give it gas for the first 5-10 seconds while it is starting.

If I use the 5th gen IACV, I rarely have a cold start issue, but the car will bog down and occasionally stall (while driving!!).

I swapped out the 5th gen IACV and put back in the 4th gen IACV because I did not like how it was shutting the car off when I put in the clutch and put the car into neutral coming from 40mph to a stop.

So, what are all you 00vi guys running? I hear that most of you do not have cold start issues, or any other issues from your VI swap. Aside from the cold start and a random misfire (crap back coils) I have no other problems with my VI.

 

I am using the 5th gen iacv and the only cold start issue i have is before the car is warmed up. So if i leave the car overnight and come to it the next morning it will start perfectly normal but once i start to drive it will cut out if i dont keep my foot on the gas a little bit, so I have to do two footed braking. The cutting out stops once the car revs above approximately 2000rpm.

So pretty much once the car is warm I do not have any signs of the car cutting out.

Hopes this helps.
Stephen

 

I kept the fourth gen iacv with stephenmax's adapter plate and it works perfect. And good thing I went that route because I'm gonna use it in the 3.5 swap

 

Currently using 4th gen IACV. I have the startup issue you described (but only when the actual temperature outside is cold, i.e. 40 or below, otherwise I don't have a problem). I OCCASIONALLY have the bogging at a stop for the first little bit the car is warming up, but not that often, and I two foot brake when it's cold out for a while just instinctively anymore.

I think when it gets warmer out (and consequently I feel like working on my car), I will work on relocating my IACV closer to the port on the manifold to see if it changes anything. Unfortunately I won't know 'til next winter if it helped or not because I never have issues when it's above 40 degrees outside.

 

This sucks. I thought given how much time and discussion has gone by over the years, you guys figured out all these 00vi issues you're describing. I thought I read that all of these issues have been figured out, and there was a "magic formula" of parts to use, so to speak. Am I wrong? Are most people still having driveability issues?

I was actually starting to consider switching from my MEVI to the 00vi I have sitting in my garage....

 

Nope, still working on the kinks, I think...

And, do it. 00vi > mevi



Back OT, Running 5th gen IACV, no issues (knock on wood), but it doesnt get cold here, upper 30s if anything. Mine doesnt like to start, have a battery on its way out.

 

Wizard, we may still have some drivability issues, but it's very dependent upon climate it seems like. The problem with most of us is that we're lazy and we own Maximas, so most of us don't have money to tinker around with different setups at will Honestly, they aren't even that big of a deal and I will one day figure it out. It's just so minor and I don't drive my car enough that I have no real reason to care haha.

 

I'm having the same issue running the 4th gen iacv but i'm pretty much used to it. I knew this would be a problem before doing the swap so I was prepared for it. If someone figures it out then it would be great.

 

I agree fully that the climate does play a role with the idling issues. Its too bad I do not live in a warmer climate...where I wouldnt have to worry about it.

I just wanted to make sure that I was not the only one with this scenerio, as most people say "Oh yea, everything is running 100%". Glad to clear this up.

And if anyone ever comes across the solution (most likely not, but yet still possible) to the funky idle issue, let us in on it.

 

oh sh*t i thought the 4th gen IACV was the way to go so i ordered the pricey plate today. Im currently running the 5th gen one, It starts up INSTANTLY everytime even when below freezing, but the idle just blows sometimes its like 900 sometimes like 500, sometimes it cant make up its mind so it just shudders, sometimes it idles perfectly lol. Never has it died while driving though, only ever died once when it was idleing at 500 and i turned the climate control on (obviously wasnt suprised at that). Oh well now that i ordered it i might as well just try it.

 

I run the 5th gen ivac no cold starting issue and no idle. There is a small screw on the tb which you can adjust on the controls to the butterfly plate.

 

yeah i am running a 5th gen iacv. i do have cold start problems. but it doesnt matter if its -15F or 30F it still has the bad cold start. so if any of you were wondering if the temp gets bad does the start up get worse. The answer is no.

 

what sucks is all our problems vary, like with my 5th gen IACV i have NO starting issues at all but idle sucks, yet others idle fine and starting sucks.

Adjusting that screw mentioned above does just that - controls the butterfly plate but still doesnt help with idle as the throttle plate is closed at idle

 

it helps alot with idle, i have almost no problems with full dek

 

hmmm i guess i could try it again, when i first was messing with the idle i adjusted that and its either crap really low idle (like 500) and when the screw is moved to open the butterfly plate (even the tiniest TINIEST bit) the IACV reacts to it and idle would jump to like 1400-1500

 

If you move the screw on the TB, there will be no way to get it back to factory spec. I wouldn't recommend messing with it unless you have a spare TB you can put back in.

And it is odd that some people have starting issues with their 5th gen IACV. When I was running one, I usually started fine but had a crappy idle at all times. For me it is better to run a 4th gen IACV and deal with the 3-4 seconds I have to hold the gas every time I start the car, rather than worry about the car stalling out on me while I am coming to a stop, or coast down a hill in neutral.

 

I'm using the 4th gen IACV and have cold start probs. I think my problem is due in part to removing the wax element (built into 4th gen tb, holds open butterfly to idle up engine on cold start), and also having an 11lb flywheel. The engine starts, but the the rpms drop and it dies. I have to wonder if the stock flywheel would have enough momentum to keep the engine spinning and catch itself before it dies. Either way, this summer I'm going to switch to the 5th gen IACV since (i believe) it houses the 5th gen equivalent to the 4th gen wax element. Hopefully this will keep the rpms from dropping, and I guess I'll see what happens when only using one of the three 4th gen IACV connectors...

oh and my cold start sucks more than most i think. I have to rev it for a good 5-10 seconds, and then it'll idle at 550 till it warms up fully. Good luck driving it with the aluminum flywheel and an on off switch for a clutch when it's idling at 550 and turning the wheel kills it. very fun, trust me...

 

ok sweet so this confirms that i just blew 60 bucks on the 4th gen IACV plate HA. my cold starts are perfect, idle is aroind 1300 when the coolant temp is cooler and slowly drops back down once temp is raised....but still idle fluctuates sometimes.

 

using 4th gen TB I'm guessing?

 

5th gen tb and IACV right now, i just bought the plate to use the 4th gen IACV

 

well sweet. hopefully that's a sign that my idle problems will be fixed when I switch to the 5th gen IACV!

EDIT: I meant starting problems. idle is fine.

 

My idle is perfect with my 4th gen IACV. The only problem is the starting.

 

your idle will change completely with the 5th gen IACV lol

 

meaning the 5th gen iacv it gonna make it idle crappy?

 

it could make it crappy some have good luck others not so much

 

Depending on the climate you live in, yes.

I switched from a 4th to a 5th gen and it started fine, but idled like ****, even when the engine was warm.

I think that we are able to conclude that the 4th gen IACV has a crappy start and good idle and the 5th gen has a good start and a crappy idle... at least that is what I have found it to be.

 

my 5th gen has a crappy start

 

oh well sheeit. guess I'll just have to use BOTH

 

I have 00VI's on both of my fourth gens. On my 95 N/A car I am using a fourth gen IACV. I posted about similar problems in the all motor forum. I found that using a larger hose going from the IACV to the manifold fixed my problem. No matter the temp out side my car cranks just like normal and holds steady revs. I did not have to adjust the TB idle screw or the IACV screw, they are both in the stock positions.

On my 98 I am running the same set up but it is boosted and I have a pathfider TB, and I need to push the gas on start up but only for about 2-5 seconds and it holds a steady idle no matter the temp.

Search my thread in the all motor forum, I think it may help many of you.

 

I'm pretty sure not having this is causing a few problems with my car. I just have had a chance to mess with it.

 

Good to hear about all that. I am going to try to relocate my 4th gen IACV much closer to the manifold and see if it has any positive effects. As it is, the needing to hold the gas when I start is my only real issue, so we'll see what can be done about that.

Can I ask what size hose you have going from the IACV to the manifold on your NA car? I currently have 1/2" hose, I think, and if yours is bigger I may upgrade as well.

 

haha that was my original idea...a larger hose! i just knew there was no way it could get enough air thru the tiny hose its using. When I turn the screw on the IACV, nothing changes, so I figured the tiny hose was maxed out flow wise. Maybe I'll give that a try before ditching the 4th gen IACV.

 

I'm using the 5th gen. The key to keeping the car running good is maintenance just like anything. I'm finding cold start problems and bogging when I come to a start a real problem now. Given I had the swap for over 2 years now I found that to remedy the situation you need to clean your TB plate to remove any carbon that has been built up. Clean your intake filter, and lastly change your spark plugs. Always pay attention to the little screw on the TB. If your on top of these items you shouldn't experience any bogging or cold start issues unless its really cold outside.

 

here is my thread when I figured out my problem. I drilled the old fitting out and made the hole big enough for a 1/2" fitting and I used a 7/16 peice of heater hose. the peice that I bought already had a "U" bend in it so that when I got the proper angle of the hose from the IACV to the manifold there were not kinks or anything. I have been running this set up for almost a year now and it fires up every time and does not have any issues with idle or dieing.
http://forums.maxima.org/showthread.php?t=399160

If anyone needs a picture of what I did I can take one. I just realized I do not have any pictures hosted online of my current IACV set up.

 

nah my air filter's brand new, i could literally eat off the TB its so clean, and plugs were changed recently... Its just were using something that wasnt made to be there so some of us have minor starting or idleing issues.

cardana24: i would also like to know what size hose you are using. Are you using StephenMax's adapter with the 3/8ths nipple or a larger nipple?


edit: answered above

 

If you are bringing the car to Tapouts I can help to show you what I did. If you want help doing it pick up a 1/2" to 1/2" barbed fitting from Lowes/Home Depot in the plumbing section and bring a drill with a bunch of bits, and JB stick weld. Also if you still have the skinny fitting on the rear of the manifold neck that will need to be drilled out so you can JB weld the 1/2" fitting into place. I'll try to get a picture tonight so if you want to get parts and bring tools we can work on it.

 

I left that nipple on there. I just added the 1/2" fitting to the manifold, and used the 7/16"s pre bent heater hose.

 

cardana if you get a chance would you mind taking a snapshot of your setup? i wouldnt mind seeing the pre bent heater hose and what not. greatly appreciated

 

okay, i went out and took a few pictures. Hopefully this will clear up what I tried to describe.



and just because

 

ahh thankyou. that was dayum quick