Car dies, when out of gear.

[sl87]

Having issues with hesitation/bogging.

First off, if I tap the throttle quick, it hesitates, then the RPMs rise. I believe
it’s a tune issue.

My problem: When the car is warm, every time I need to slow down to a complete stop, I either pull it out of gear or hold the clutch down. Once the car is in neutral, the rpms drop, it drops very low to 200-300 rpm, then it either dies or (if im lucky) will stay alive.
If the motor is cold, I do not encounter this problem. It’s only after I drive the car around for about 5-10 minutes.

Mods:
Redtop sr20det
Fully rebuilt motor
Upgrade turbo
264 BC cams
AEM Standalone
AEM MAP sensor
ISIS Intake Manifold
Aeromotive FPR
810cc d-werks injectors
FMIC
New redtop optima
Quest Alternator Upgrade

If there is any other mod you need to know, I can post it, this is all I can think of that can relate to my problem.

The car has not had a full tune. The only thing that was done to the ECU was to get it started up. AFR’s and timing were set. At idle, the AFR reads 11.5-11.8 ish. The FPR is set around 43. Also, the car has been sitting for a while, 1.5 years I believe.

Thanks for any input.

[Edwin562]

by any chance do you have a aftermarket lightweight flywheel???

[sl87]

No, i have stock flywheel, its just been resurfaced. I do have exedy stage 2, 3 puck clutch.

[mkezzo16]

It may be the MAF sensor , i was having pretty much the same issue with my lexus.

[sl87]

I am not running a MAF. I have converted my MAF sensor to a MAP sensor.

[n8RPS13]

A tune is what you need!

[sl87]

I just saw a thread with a related issue, by r6_240sx. Im wondering if it is my IACV. I sprayed it with carb cleaner, but i never took it apart and cleaned it. You think that would make a big difference??

[yurisfriendevan]

could also be a big vacuum leak.

[sl87]

Actually i just got done driving around. I realized, everytime i push the clutch pedal down then release it quick, the car bogs. Then i hold the clutch pedal down and hold it down, it bogs then it dies. Anyone had this problem? Kind of weird if you ask me..

[VATOCLOWN]

have you tried turning up the idle with the iacv screw maybe the idle is set to low

[sl87]

No did not do that. Does that have to do with the clutch situation? Because, it hold an idle, its when i hold down the clutch, it dies.

[The240Professor]

iacv definetley. i have one for sale.

[sl87]

Haha, alright. Ill mess with mine first, but ill keep that in mind. Thanks for the offer. Can anyone explain why it would be the IACV? I'm just confused on what it has to do with the clutch. Thanks all.

[VATOCLOWN]

so if you leave it in neutral with the clutch pedel up the car idles fine? its when you push the clutch pedal in when the can dies? im stumped sorry man

[sr20d's2k]

my buddies car used to do this til he got retuned

[sl87]

All of this is done when the car is sitting still. The car idles fine, when in neutral and clutch pedal is up. When i push the clutch pedal down and let it back up, it bogs but stays alive. When i hold the the clutch pedal down, it bogs then dies.

[KiLLeR2001]

Do you have the neutral position switch in the transmission hooked up? Normally this wouldn't really effect a stock car if it's not installed, but since you have a lot of upgrades done to the car, not having the switch wired up properly might be causing your issue.

[s13 @ fullboost]

load on the engine lol? I have to idea but I am very interested to find out what would really cause that.

[sl87]

Killer2001, i will check that out. I remember seeing that on my AEM ECU diagram. I take a look at that wire, and check out the sensor.

[carmaniac1993]

i have a sorta similar thing goin on. when i put it in gear with the clutch in, it starts doing a random miss. doesnt die or nothin. just thought it was kinda wierd.

[sl87]

I'm reading other threads, and they say you don't even need Neutral position switch, i also read some where they usually remove it altogether. I wonder why it would effect my idle. Ill still check to see if its the problem

[KiLLeR2001]

Stock ECU may be able to calculate an idle without the sensor, maybe the AEM unit needs the sensor signal in order to maintain a smooth idle when in neutral. Doesn't hurt to have it installed though?

[Most Wanted]

iacv definetley. i have one for sale.

I need one as well, whats the condition on the one you are selling? is it the one with metal or plastic screw?

[Drftr915]

I had this same problem when i had my bov to atmosphere, but since you are converted to map sensor that shouldn't be an issue. I second the vacuum leak, i would do a full leak check before i start buying parts. I made the mistake of buying a brand new iacv off of frsport. I am not saying that couldn't be the problem though. Good luck though, i hated when my car did this.

[sl87]

Stock ECU may be able to calculate an idle without the sensor, maybe the AEM unit needs the sensor signal in order to maintain a smooth idle when in neutral. Doesn't hurt to have it installed though?

Now i know why it the neutral position switch sounded famaliar when you mentioned it earlier. Its because now that i am running a MAP sensor. The MAP sensor replaces the Neutral Position switch pin on the AEM standalone. Obviously im going to need the MAP sensor more than the neutral position switch, and ive read that neutral position switch isnt even needed. Im confused. I guess the tuner would be able to figure out why when he tunes it??

There was another thread that had the same problem, he said one of his wires on his harness got some rubbage from his tire and shredded a wire. Ill look around that area too.

Anyone else have ideas?

[DoobieS13]

When driving, shifting, getting on it, all runs fine??

[G5SR20240]

Keep it simple, check for vacuum leaks!

[sl87]

When driving, shifting, getting on it, all runs fine??

Yup. Everything runs fine. The only thing i would say is, if i tap the gas real quick, there is a slight slight bog, then it revs up. If i gradually press on the gas, no bogging issues.

I will check the vacuum lines. mind as well.

[DoobieS13]

Ok...so not fuel related because of the whole clutch thing...not egr bcuz everything is fine down the road...i would check vaccums like everyone else...

[ddf2006]

sounds vacume related

[sl87]

I figured out the problem, it was the IACV. The big hose that connects to the IACV to my intercooler piping wasnt clamped all the way. I tightened that up, and so far so good. The car still drops 100-200rpm when the clutch is being held down, but this time it doesn't completely die. It might be the same hose causing that problem because the clamp im using is shit, and the hose is pretty thick and hard, I'm going to change out the hose and clamps to get a better fit. Thanks All for the help and your suggestions.

[BlewByYou]

Sounds like a leak somewhere. seal it up good should be fine

[The240Professor]

ahhhh see i said the iacv i was half right lol