Idle Issues - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

S14kouki805 · 01-19-2017, 05:51 PM

On cold starts my idle bounces up and down between 1000-2500RPM and will sometimes stall out if I'm not steady on the gas. Problem goes away after the car is warm though.

The engine is an S13 blacktop, Z32 MAF, Blitz atmospheric BOV (I know I need to recirculate).

I was having issues with stalling after high boost due to the BOV, so increased the idle using the screw at the IACV.

I'm thinking TPS or temperature sensor. The thermostat is new.

Any ideas?

S14kouki805 · 01-20-2017, 11:38 AM

Anybody?????

cbeuglas · 01-20-2017, 01:24 PM

Check your codes, clean throttle body, check tips setting, what is vac psi at idle

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cbeuglas · 01-20-2017, 01:26 PM

My old z32 would bounce when the throttle body was dirty. Not saying it will fix it but it's cheap and easy.

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S14kouki805 · 01-20-2017, 03:29 PM

Quote:

Originally Posted by cbeuglas

Check your codes, clean throttle body, check tips setting, what is vac psi at idle

Sent from my SAMSUNG-SM-G920A using Tapatalk

Thanks I'll try that, any other suggestions anyone out there?

Kingtal0n · 01-21-2017, 10:57 PM

try blocking the bov so it cant leak any air first. then do a pressure test if it still has trouble.

S14kouki805 · 02-21-2017, 04:48 PM

Ok, so I replaced the temperature sensor, cleaned the MAF and throttle.

Car seems to run smoother but still have the cold start/idle issue albeit not as bad.

I also have the issue of it firing up on the 2nd try only. First turn of the key never works but will fire right up on the 2nd time EVERY time. From what I can find it may be the FPR going out or leaking.

EarlsWorld · 02-26-2017, 09:41 AM

you say its bouncing up and down?

does it ever randomly hold at around 3000?

my guess would be faulty wiring connection on the idle control valve.

01-19-2017, 05:51 PM	#1
S14kouki805 Zilvia Addict Join Date: Aug 2014 Location: California Age: 43 Posts: 808 Trader Rating: (5) Feedback Score: 5 reviews	Idle Issues On cold starts my idle bounces up and down between 1000-2500RPM and will sometimes stall out if I'm not steady on the gas. Problem goes away after the car is warm though. The engine is an S13 blacktop, Z32 MAF, Blitz atmospheric BOV (I know I need to recirculate). I was having issues with stalling after high boost due to the BOV, so increased the idle using the screw at the IACV. I'm thinking TPS or temperature sensor. The thermostat is new. Any ideas?

02-26-2017, 09:41 AM	#8
EarlsWorld Join Date: Jan 2017 Location: alberta canada Age: 26 Posts: 44 Trader Rating: (0) Feedback Score: 0 reviews	you say its bouncing up and down? does it ever randomly hold at around 3000? my guess would be faulty wiring connection on the idle control valve. __________________ How cool is being cool?

01-20-2017, 11:38 AM	#2
S14kouki805 Zilvia Addict Join Date: Aug 2014 Location: California Age: 43 Posts: 808 Trader Rating: (5) Feedback Score: 5 reviews	Anybody?????

01-20-2017, 01:24 PM	#3
cbeuglas Zilvia Member Join Date: Apr 2013 Location: United States Posts: 266 Trader Rating: (3) Feedback Score: 3 reviews	Check your codes, clean throttle body, check tips setting, what is vac psi at idle Sent from my SAMSUNG-SM-G920A using Tapatalk

01-20-2017, 01:26 PM	#4
cbeuglas Zilvia Member Join Date: Apr 2013 Location: United States Posts: 266 Trader Rating: (3) Feedback Score: 3 reviews	My old z32 would bounce when the throttle body was dirty. Not saying it will fix it but it's cheap and easy. Sent from my SAMSUNG-SM-G920A using Tapatalk

01-21-2017, 10:57 PM	#6
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 42 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	try blocking the bov so it cant leak any air first. then do a pressure test if it still has trouble.

02-21-2017, 04:48 PM	#7
S14kouki805 Zilvia Addict Join Date: Aug 2014 Location: California Age: 43 Posts: 808 Trader Rating: (5) Feedback Score: 5 reviews	Ok, so I replaced the temperature sensor, cleaned the MAF and throttle. Car seems to run smoother but still have the cold start/idle issue albeit not as bad. I also have the issue of it firing up on the 2nd try only. First turn of the key never works but will fire right up on the 2nd time EVERY time. From what I can find it may be the FPR going out or leaking.