**Weird Idle on cold starts** - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kvahag · 07-14-2008, 07:12 PM

Hey everyone, my friend is having a problem with his s13 and I hope someone can help us out.

The problem is that when the motor has completely cooled off and when he starts it the rpms suddenly drop to almost 0. The car almost stalls but then it goes back up to 1000 rpm, and then back to 0, and then back to a 1000, and then back to 0, and then to normal idle. What could this result from?

Thanks in advance guys!

makulit054 · 07-14-2008, 09:25 PM

need more info on the setup?

kvahag · 07-14-2008, 10:37 PM

stock ka24de

its just been acting weird every single time he starts it up cold

warpd · 07-14-2008, 11:37 PM

Idle air control valve? Only thing I can think of off the top of my head.

kvahag · 07-15-2008, 12:46 AM

yea my friend thinks its the idle air control valve too, i just wanted to get other peoples opinions before he drops money on a iac valve

SoguRacing · 07-15-2008, 12:58 AM

IAC or maybe a faulty coolant temp sensor.

awesomenick · 07-15-2008, 10:47 AM

Before buying a new one, he should try to clean it out/ test it. There's tons of info about this online, so you shouldn't have trouble finding it.

kvahag · 07-18-2008, 02:32 PM

found out some more info that might help figure out the problem!

he told me when he turned on the car the other night, it had the same almost stalling problem...and each time the rpms would drop so would the electricity level. like the interior lights would dim and light back up then dim again.

and he just changed the battery, can this be the alternator?

makulit054 · 07-18-2008, 05:24 PM

I don't think it's the alternator. the drop in electricty is related to your rpms dropping. It sounds like temperature related. IACV and engine coolant temp sensor, have you checked those yet. check the voltages.

kvahag · 07-19-2008, 02:11 AM

Quote:

Originally Posted by makulit054

I don't think it's the alternator. the drop in electricty is related to your rpms dropping. It sounds like temperature related. IACV and engine coolant temp sensor, have you checked those yet. check the voltages.

going to clean the iac valve this weekend.

suislide91 · 07-19-2008, 03:05 AM

same thing happend to me, mine would go from 1500 rpm at start to then drop to 200 rpm, barely hold on then die. several times and die. i replaced the alternator, new ground wires and re-did my timing, worked for me. try it?

kvahag · 07-21-2008, 01:07 AM

Quote:

Originally Posted by suislide91

same thing happend to me, mine would go from 1500 rpm at start to then drop to 200 rpm, barely hold on then die. several times and die. i replaced the alternator, new ground wires and re-did my timing, worked for me. try it?

never dies...its just drops and goes back up and repeats. iacv cleaning tomorrow, we'll see how it goes.

suislide91 · 07-21-2008, 07:31 AM

hmmm i see i see. good luck bro

07-14-2008, 07:12 PM	#1
kvahag Zilvia Junkie Join Date: Nov 2007 Location: SoCal 818 Posts: 363 Trader Rating: (1) Feedback Score: 1 reviews	Weird Idle on cold starts Hey everyone, my friend is having a problem with his s13 and I hope someone can help us out. The problem is that when the motor has completely cooled off and when he starts it the rpms suddenly drop to almost 0. The car almost stalls but then it goes back up to 1000 rpm, and then back to 0, and then back to a 1000, and then back to 0, and then to normal idle. What could this result from? Thanks in advance guys! __________________

07-14-2008, 10:37 PM	#3
kvahag Zilvia Junkie Join Date: Nov 2007 Location: SoCal 818 Posts: 363 Trader Rating: (1) Feedback Score: 1 reviews	stock ka24de its just been acting weird every single time he starts it up cold __________________

07-15-2008, 12:46 AM	#5
kvahag Zilvia Junkie Join Date: Nov 2007 Location: SoCal 818 Posts: 363 Trader Rating: (1) Feedback Score: 1 reviews	yea my friend thinks its the idle air control valve too, i just wanted to get other peoples opinions before he drops money on a iac valve __________________

07-15-2008, 12:58 AM	#6
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 39 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	IAC or maybe a faulty coolant temp sensor. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

07-18-2008, 02:32 PM	#8
kvahag Zilvia Junkie Join Date: Nov 2007 Location: SoCal 818 Posts: 363 Trader Rating: (1) Feedback Score: 1 reviews	found out some more info that might help figure out the problem! he told me when he turned on the car the other night, it had the same almost stalling problem...and each time the rpms would drop so would the electricity level. like the interior lights would dim and light back up then dim again. and he just changed the battery, can this be the alternator? __________________

07-14-2008, 09:25 PM	#2
makulit054 Zilvia Member Join Date: May 2007 Location: socal Posts: 215 Trader Rating: (1) Feedback Score: 1 reviews	need more info on the setup?

07-14-2008, 11:37 PM	#4
warpd Join Date: Jun 2007 Location: Auburn,AL Age: 39 Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	Idle air control valve? Only thing I can think of off the top of my head.

07-15-2008, 10:47 AM	#7
awesomenick Zilvia Addict Join Date: May 2006 Location: UT Age: 36 Posts: 945 Trader Rating: (33) Feedback Score: 33 reviews	Before buying a new one, he should try to clean it out/ test it. There's tons of info about this online, so you shouldn't have trouble finding it.

07-18-2008, 05:24 PM	#9
makulit054 Zilvia Member Join Date: May 2007 Location: socal Posts: 215 Trader Rating: (1) Feedback Score: 1 reviews	I don't think it's the alternator. the drop in electricty is related to your rpms dropping. It sounds like temperature related. IACV and engine coolant temp sensor, have you checked those yet. check the voltages.

07-19-2008, 03:05 AM	#11
suislide91 Join Date: Jun 2008 Location: LA area Age: 35 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	same thing happend to me, mine would go from 1500 rpm at start to then drop to 200 rpm, barely hold on then die. several times and die. i replaced the alternator, new ground wires and re-did my timing, worked for me. try it?

07-21-2008, 07:31 AM	#13
suislide91 Join Date: Jun 2008 Location: LA area Age: 35 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	hmmm i see i see. good luck bro