Well i finally got my vaccuum issues resolved since the MEVI install since Im no longer throwing idle air control CELs (acutally i just didnt plug up the vaccuum canister and found some better fitting lines. im waiting to do this till I install the EU so I can set the rpm switch with that). I also seafoamed the motor on saturday and it seems to run fine after sputtering white smoke for like 5 min I havent noticed really any performance differences but hopefully its flushed out the 100k mile motor pretty well. Only problem im having now is that when I pull the car out of gear into neutral upon approacing a stoplight the car wants to drop all the way to like 200 rpms and almost stall unless i save it with a quick tap of the gas pedal. If I do this the tach settles back at its idling point of about 700 rpms (which is actually where it was set with the USIM before we started messing with the IACV upon installing the MEVI). How can I cure this? Do i just need to set the idle higher since its a different manifold? Thanks guys,

Grant

 

Try setting it a little higher. Maybe 100 RPMs or so. Does this happen only when the A/C is on, or does it not matter if it's on or off?

 

Alright, ill try that. The AC has always been off during this. So do I adjust that little black round **** near the IACV or the actual position of the throttle cable by moving that little screw back and forth. Sorry about the newbish description.

Grant

 

Grant,
There was no need to mess with the IACV upon installing the MEVI. Since you had vacuum leaks, it sounds like you tinkered with the IACV trying to solve your initial problem. Now that the vacuum leaks are gone, you need to put the IACV back the way it was.

I'm still baffled why you didn't install the MEVI wiring and hoses completely to begin with. It's not like the EU followed within a couple of days. With all the time you've spent troubleshooting and dealing with codes, you probably could have had the MEVI wiring and hoses completely done.

If you need help with the wiring and vacuum lines, let me know.

 

Im having the exact same problem...stalling out

Brand NEW IACV, Emanage Ultimate

-matt

 

very wierd, my friend actually stalled out after the VI install and that was without the IACV plate. This was with AC off and coming to a stop. Never had a problem since

 

Yep just turn the screw either way and see what it does to your idle. If it lowers it, turn it the other way. If it raises it, you're in business

A good mechanic I know (definitely knows his VQ's) said that's really common, especially when the A/C is in use which is why I asked. Try raising it a little and see what happens.

 

I adjust my idle via ECU screw.. Limited range, but effective for my needs nonetheless.

 

That's the thing, we did have everything hooked up on the initial turn of the key. The only thing that wasn't connected was an RPM switch for the MEVI activation. I thought about installing a simple toggle switch for Grant like I have atm in my car (getting my new place cut into my EU fundage ), but we decided against it.

As for connecting everything, and why it was unhooked... Initially I thought that the vaccuum leak was being caused because the selenoid might have been connected backwards. So in order to make sure that wasn't the culprit, I just simply bypassed/unhooked all the vaccuum components for the MEVI's activation. The real culprit of the leak was from the vaccuum hose going to the EVAP. The MEVI's fitting was much smaller than the factory fitting (since there is no manifold mounted evap for the ME/JP models), so we used a small hose over the fitting and then snugged down the factory hose over that. We thought it would be ok, but it was the ultimate source of the CEL and the vaccuum leak.

As for the wiring, I just need a Saturday when Grant an I both don't have to work, and I can handle/sort that out. I'm not going to lie though, that EU harness is rather intimidating. I might make a harness connector like Goaliekeg did so there's no "permanent" damage to the factory harness should something get wired wrong or anything like that.

 

Hmmmm.... that's where you lost me. When I installed my MEVI, all fittings were the same size as OEM.

 

they were the same size on my 95 as well. The way the evap was mounted (on top of the intake manifold) it had a 90* bend in the vaccuum port, and the size of the vaccuum line feeding it was a good 1/8" larger in diameter than the straight fitting on the MEVI. We thought we had a simple solution, what we got was a problem, heh. Grant found a hose at autozone that fit great and then boom, problem solved other than his weird idle down issue when coming to a stop. I haven't actually been in the car to see what it's doing, but there's a small chance it could be TPS related. We didn't unhook the TB completely in his swap like i had to on mine (PF-TB), but there's a chance his TPS could have been moved wrestling the MEVI on.

BTW - side rant, why in the hell did Nissan have to run that coolant line through the manifold like they did. That thing is such a b!tch to dis/connect, especially if you have big mits.