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

flclsteve · 10-09-2007, 12:36 AM

I search and found that the problem can be a million diffrent things so im in need of some help.

When the car is just being started up it idles normally
after the car gets warmed up when at a stop the rpm gauge moves slowley up to the 1500 1400 mark. Thats only at a stop when I shift to nuetral it idles normally 500-800 range but as soon as i stop it will jump back up to the 1500 mark.

The car is a 90 240 sx stock single cam motor only mod would be the intake theres also kind of a poping sound comming from the exhaust.

S13Leprechaun · 10-09-2007, 01:25 AM

pretty sure the popping sound doesnt matter, if im not mistaken thats something with backpressure.... anyway, ive heard rumors of intakes making idles wierd on some cars.. dont know what it is but it does sometimes.. reset your ECU

flclsteve · 10-10-2007, 07:40 PM

How would i go about setting my ecu? and what exactly is that gonna do to help out just curious. any other ideas what it could be or is it even that big of a problem?

s13rookie · 10-10-2007, 08:05 PM

My car did the oposite thing. It would idle fine in gear but would stall as i came to a stop at a light or something. Mine was a dirty and misadjusted idle air control valve. You may want to check on that, also check the voltage/resistance of your tps

10-09-2007, 12:36 AM	#1
flclsteve Zilvia Junkie Join Date: Aug 2007 Location: Irvine Age: 35 Posts: 538 Trader Rating: (2) Feedback Score: 2 reviews	Rough Idle Question I search and found that the problem can be a million diffrent things so im in need of some help. When the car is just being started up it idles normally after the car gets warmed up when at a stop the rpm gauge moves slowley up to the 1500 1400 mark. Thats only at a stop when I shift to nuetral it idles normally 500-800 range but as soon as i stop it will jump back up to the 1500 mark. The car is a 90 240 sx stock single cam motor only mod would be the intake theres also kind of a poping sound comming from the exhaust.

10-09-2007, 01:25 AM	#2
S13Leprechaun Zilvia FREAK! Join Date: Jan 2007 Location: 1904 Posts: 1,110 Trader Rating: (0) Feedback Score: 0 reviews	pretty sure the popping sound doesnt matter, if im not mistaken thats something with backpressure.... anyway, ive heard rumors of intakes making idles wierd on some cars.. dont know what it is but it does sometimes.. reset your ECU __________________ *thurs. knights.*

10-10-2007, 08:05 PM	#4
s13rookie Zilvia FREAK! Join Date: Mar 2002 Location: connecticut Age: 44 Posts: 1,129 Trader Rating: (0) Feedback Score: 0 reviews	My car did the oposite thing. It would idle fine in gear but would stall as i came to a stop at a light or something. Mine was a dirty and misadjusted idle air control valve. You may want to check on that, also check the voltage/resistance of your tps __________________ Ive spent most of my money on cars and women...the rest i wasted

10-10-2007, 07:40 PM	#3
flclsteve Zilvia Junkie Join Date: Aug 2007 Location: Irvine Age: 35 Posts: 538 Trader Rating: (2) Feedback Score: 2 reviews	How would i go about setting my ecu? and what exactly is that gonna do to help out just curious. any other ideas what it could be or is it even that big of a problem?