This happened to me once as well a couple weeks ago a day or two after I installed it. Threw it in neutral down a hill going about 40mph and it stalled out.

Check to see if you have the z-tube (if you have that part), that there is no gaps between it and the throttle body. I checked that after I was idling low, and that was the problem.

Also, did you reset the ECU? Because after I did that, it hasn't happened again.

 

05 6MT with 47k miles, MotorDyne 5/16 spacer and MERV2, also Fast Intentions 300cell HFC

 

Yeah, I believe I reset the ECU. Disconnected the Negative (-) side on my battery while doing the installation which took me about 30 mins. I got the High Flow air filter which connects like so.
http://www.stillen.com/product_images/402835.jpg
[Intake plenum>MAF>High Flow adapter aka Velocity Stack>Filter]

but yeh, I re-installed everything again and checked for obvious gaps..I actually need quite a bit done to my car so I think I will take it to the dealer and see if I can make magic and have them clean the MAF..I am afraid i will mess it all up ahha..

OFF TOPIC:
But my car needs 60k maintenance
Has a squeak from suspension [back right wheel sounds like strurt/rubber against metal?]
Has the sound of a blow-off valve when i rev near 2-3k hah [kinda like it]
and this problem of course...

 

If it only happened to you once, I wouldn't worry about it. Like I said, it never happened to me again, and I went back to the same hill to make sure haha

 

Yeh, but it has happened to me many times. I will be cleaning my MAF out and checking for results, and that other stuff needs to get fixed anyway...any clue how much the 60k work costs? and what is included?

 

oil change
tranny drain and fill
Diff. drain and fill
air filter (oem air box)
cabin filter
spark plugs

all this can be done yourself, save the cash.

 

I just dont have the tools nor the time, and more importantly i dont trust myself to do the work! I will ask them for a quote and if its too much I will check some local shops...

 

buy the parts online from some vendors in here..

and have your local mechanic install them ..

also ..

doesnt disconecting the battery overnight reset the ecu ??

 

I think its just for a few mins if i'm not mistaken..

 

try to find a local G member here who is willing to do the work for you.

 

Yes

 

Cleaning the MAF may be needed if your filter was over-oiled, but that's a procedure fraught with $$$ peril for avg person. I've checked my vac lines, replaced my PVC valve, tried to reprogram idle but it won't idle smoothly enough w/o very occasionally throwing either a random misfire code or lean condition detected. I can't get it into the learning mode any longer to reset the Idle Air Volume (IAV Learning).

I have had same stalling issues. Have the same intake plus AAM angled plenum spacer. I just pulled the plugs last night, they are 5+ year old and the gap ranged from 0.050 to a little more (FSM says 0.035). People remember the 100k miles but forget it says 60 months or 100k miles, whichever comes first.

There is also a JWT advisory for something similar which involves idle problems/stalling when rapid lift off throttle after JWT intake is installed, which is in all practical measures the same thing as the Stillen w/venturi ring. Doc title is "350Z_DECEL_STABILITY_FIX" and it's a little useless to try to explain w/o the pic, but it splices into the crankcase breather hose that goes from the left valve cover to the intake tube.

http://www.jimwolftechnology.com/wol...BILITY_FIX.PDF

It appears to be addressing what looks like a possible vacuum issue. I believe this approach is trying to address too sudden of a change in vacuum drop at the intake plenum. There's hardly any info on JWT's site about this, but stabilize idle after rapid throttle lift is pretty clear - mine does not always stall and it happens most frequently when I am moving 40-50 mph plus, push in the clutch, getting ready to make a turn or come to a stop.

Picking up new plugs first as the older set wasn't too far out (0.007") but the idle isn't consistently smooth, plugs cannot hurt and they're relatively inexpensive.

If that doesn't help, I'll reset the ECU again, try to get the IAV learning to work. When I first got the intake, I had to do that or I was getting some very infrequent stalling. It got worse after adding the plenum spacer, before that I wasn't throwing any codes.

Sorry don't have a definitive answer, will post back if I go ahead with the JWT fix or if simple plugs, etc. make it go away.

HTH

 

That's good advice, I don't like the fit of the Z-tube to TB using the stock accordian clamp, I have 3 feet of Thermaflex 3" tubing for intake joints and intercoolers, etc. Hoping that pipe is 3", too. If not I may just replace it with a section of Aluminum 3" intake pipe left over from my CAI project on my B13 SE-R.

It that leaks air, then the MAF will read less air than is actually coming in, cause a lean condition which is one of my 2 codes I've seen. I've checked everywhere around the plenum for leaks, tubing, etc. and the one place that looks poor is the fit to the TB from the Z tube.

 

I also have a 6MT G35 Coupe, '04 with all the OEM options, then Stillen Intake/Popcharger, Z tube, AAM Plenum Spacer, AND a big potential contributor - JWT alloy Flywheel. Light FW lets the revs fall down about as fast as up, it really drops a lot quicker without the 32 lb OEM boat anchor dual mass FW. However what goes up must come down, and it's freer revving, but also falls faster...

Also if I have been leaking at all near the TB, time to clean it. Much lower risk operation than cleaning your MAF.

IDK what's really wrong with it but I had the intake fine for a year or more and the IAV learning seemed to smooth things out, I think this now is more just as I approach 60k miles, some more basic maintenance is needed. When I see plugs worn down on the tips to 20% over gap spec, that's probably as sign they need replacement.

 

As an update: I had my mechanic do the 60k maintenance suggested by the dealership. [they quoted me 700 my mechanic did it for 200 ] anyway, i also had him clean throttle body and MAF and now my idle is fine, so although its hard to really pinpoint the solution, i would have to say the MAF would be the most probable cause for this problem, due to an over-oil K&N filter ...I did not have to do any resets for my idle or anything although i doubt it could hurt.