SR20DET Stalling in neutral/decel - IACV?

[2fast4y0u]

WOW! seems like this is a large issue because i to have very similar issues.
2871rs
step 2 cams
z32 maf
850cc injectors
recirc BOV
greddy intake
Enthalpy rom tune
yadda yadda yadda

i just bought another iacv to test mine to it. i tried adjusting the screw in it and nothing. i havent really messed with the Throttle body set screw though.

i was told as well, and this couldnt be complete BS but if you are running a slim battery such as me, the slim batteries dont have enough reserve power to compensate the voltage draw when your idle is lower. My alternator doesnt charge the battery at startup unless i rev the car to about 3k rpm's then it will start the charging. i have taken it to auto zone, napa, car quest and they all say its good. BUT ITS NOT!!!

so point of my ranting here is check your voltage as well, especially on your decel. mine drops off like crazy...something like into the 11v area

oh, how are you setting your AFC on the decel? i guess i have missed that feature

[240sx blue pearl]

Originally Posted by 2fast4y0u

WOW! seems like this is a large issue because i to have very similar issues.
2871rs
step 2 cams
z32 maf
850cc injectors
recirc BOV
greddy intake
Enthalpy rom tune
yadda yadda yadda

i just bought another iacv to test mine to it. i tried adjusting the screw in it and nothing. i havent really messed with the Throttle body set screw though.

i was told as well, and this couldnt be complete BS but if you are running a slim battery such as me, the slim batteries dont have enough reserve power to compensate the voltage draw when your idle is lower. My alternator doesnt charge the battery at startup unless i rev the car to about 3k rpm's then it will start the charging. i have taken it to auto zone, napa, car quest and they all say its good. BUT ITS NOT!!!

so point of my ranting here is check your voltage as well, especially on your decel. mine drops off like crazy...something like into the 11v area

oh, how are you setting your AFC on the decel? i guess i have missed that feature

ive heard of this being a problem before too.. but according to my little radar detector, its a constant 14.0v-14.4v. going to see if i can pick up some of that MAF cleaner tonite. and as far as opening up the throttle plate to compensate, that is a last resort for me. I think there has got to be somthing up with this.

[nothix]

Originally Posted by 2fast4y0u

WOW! seems like this is a large issue because i to have very similar issues.
2871rs
step 2 cams
z32 maf
850cc injectors
recirc BOV
greddy intake
Enthalpy rom tune
yadda yadda yadda

i just bought another iacv to test mine to it. i tried adjusting the screw in it and nothing. i havent really messed with the Throttle body set screw though.

i was told as well, and this couldnt be complete BS but if you are running a slim battery such as me, the slim batteries dont have enough reserve power to compensate the voltage draw when your idle is lower. My alternator doesnt charge the battery at startup unless i rev the car to about 3k rpm's then it will start the charging. i have taken it to auto zone, napa, car quest and they all say its good. BUT ITS NOT!!!

so point of my ranting here is check your voltage as well, especially on your decel. mine drops off like crazy...something like into the 11v area

oh, how are you setting your AFC on the decel? i guess i have missed that feature

so are you saying that all you need to fix your problem is a new alternator or a new battery?

[clark]

Originally Posted by nothix

so are you saying that all you need to fix your problem is a new alternator or a new battery?

ummmm did he yadda yadda his engine modifications?

[240sx blue pearl]

Ok, I've gotten somewhere with this.
So far I have checked timing, repositioned tps according to spec, cleaned MAF, removed\ cleaned IACV, and the problem has basicly gone away. I drove a decent ammount today trying to get it to stall everywhere I went, but it only falls to about 650ish. Only once did it fall below that but it did not stall. I think the MAF cleaner is what did the trick.

[2fast4y0u]

Originally Posted by nothix

so are you saying that all you need to fix your problem is a new alternator or a new battery?

im not saying that is all i need to do.

Originally Posted by clark

ummmm did he yadda yadda his engine modifications?

i have posted my build list somewhere on here, i just dont feel like typing it all the time


I got my tuned ecu back from RS Enthalpy yesterday. plugged it in and fire up the car. To my suprise the car GREAT! No misfire issues and it idles at like 950(which is what i wanted), i revved it up and it almost stalled but it caught itself and kept running. I know its not the same as when its under a load in driving conditions but its a start.

[s15specR]

Originally Posted by 240sx blue pearl

Ok, I've gotten somewhere with this.
So far I have checked timing, repositioned tps according to spec, cleaned MAF, removed\ cleaned IACV, and the problem has basicly gone away. I drove a decent ammount today trying to get it to stall everywhere I went, but it only falls to about 650ish. Only once did it fall below that but it did not stall. I think the MAF cleaner is what did the trick.

How exactly are you repositioning the TPS, that's the only thing I changed, and I'm having this problem.

[ross.cottrill]

Originally Posted by s15specR

How exactly are you repositioning the TPS, that's the only thing I changed, and I'm having this problem.

you have to set it with a voltmeter.i set mine to 4.5v.

[240sx blue pearl]

Originally Posted by ross.cottrill

you have to set it with a voltmeter.i set mine to 4.5v.

exactly.

For an S14 SR the resistance across the TPS should be .7k ohms closed to 5k ohms open. ..when it is unplugged and key is off

To adjust it, you have to loosen the 2 screws then turn it with your hand