idling too high! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

whitey_mb · 11-08-2002, 01:20 PM

Hello all,

I've already done a search, and couldn't find very much on my particular problem. I have a '96 5sp with about 77k miles on it. For the past few weeks, my idle had been kinda squirrly. It would be at a nice 800 or so, and then dip to 4-500, like I've read many of them do. Today, as I started accelerating from a stop at a light, my car gave a little shake, as if I had let the clutch out a little too fast. I looked down, and the check engine light was on. Everything felt and sounded normal as I drove around, though. At the next light, however, I noticed that my idle was now at a steady 1400 rpms. It stayed this way at every light from then on. Any suggestions? Could a simple tuneup be the answer, or does the check engine light mean something a little more ominous? Thanks in advance!

- Marty

Foxcolt · 11-08-2002, 02:29 PM

Check if the ECU throws codes. That will determin whether a sensor (O2) went out. If not reset the ECU and see if the CEL goes off. If it does adjust idle through Idle air control valve.

Jed

toddnappi · 11-08-2002, 03:12 PM

You could have a vacuum leak somewhere, or need to clean your throttle body possibly. Todd

Ni5mo180SX · 11-08-2002, 07:50 PM

Yea, try adjusting your timing. If that doesnt seem to make a difference, it might be a vacuum leak.

whitey_mb · 11-08-2002, 11:27 PM

Hmmmm, could a bad valve cover gasket be the culprit? Mine is kinda messed up from when I polished the valve cover. Only thing is, that was a long time ago, and this idle problem hasn't been around nearly as long. I've been meaning to replace it. Is that silicone gasket maker stuff worth a damn?

- Marty

wherezmytofu · 11-09-2002, 02:02 AM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (whitey_mb @ Nov. 08 2002,01:27)</td></tr><tr><td id="QUOTE">Hmmmm, could a bad valve cover gasket be the culprit? Mine is kinda messed up from when I polished the valve cover. Only thing is, that was a long time ago, and this idle problem hasn't been around nearly as long. I've been meaning to replace it. Is that silicone gasket maker stuff worth a damn?

- Marty</td></tr></table><span id='postcolor'>
the valve gasket should be a problem...most likely a vacumm leak..the ka is chain driven so the timing is most liky ok too.. has it just recently starting this...cuz colder weather does do that  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='

'>

camppain · 11-09-2002, 03:43 AM

forget it its to late i'll re edit tomorrow if i remember

whitey_mb · 11-10-2002, 03:54 PM

Well, it looks like I spoke too soon about the idle staying high. It's all over the place now. I just checked the ecu, and it threw a code 25 - Idle control valve circuit open or shorted. Any suggestions? Thanks.

- Marty

goodjuan · 11-11-2002, 03:00 PM

what's a code 25?

11-08-2002, 02:29 PM	#2
Foxcolt Zilvia FREAK! Join Date: Apr 2002 Location: Northern VA Posts: 1,264 Trader Rating: (0) Feedback Score: 0 reviews	Check if the ECU throws codes. That will determin whether a sensor (O2) went out. If not reset the ECU and see if the CEL goes off. If it does adjust idle through Idle air control valve. Jed __________________ Driftec www.midatlantic240sx.com

11-08-2002, 07:50 PM	#4
Ni5mo180SX Zilvia Junkie Join Date: Dec 2001 Location: Orange County Posts: 423 Trader Rating: (0) Feedback Score: 0 reviews	Yea, try adjusting your timing. If that doesnt seem to make a difference, it might be a vacuum leak. __________________ Mazda RX-7 FC3S: Jspec motor, ported turbo & wastegate, JIC FLT-A2 coilovers, Mazdatrix adj. rear camber link, TB mod, Koyo 53mm Radiator, Corksport Cat back/midpipe/downipe, 3" Al TID, Apex'i air cleaner, Mazda Comp. mission/motor/differential mounts, Mazdaspeed Strut Bar(R), FD torsen differential, HKS SSQV, HKS elec. boost gauge & elec water temp, Cusco Oil catch, 680cc secondary's, Walbro 255, Banzai Racing FCD, RB DTSS Eliminator bushings, Exedy Clutch & PP, Exedy chrome moly flywheel, RB oil baffle, RB dual alt. pulley, 5 lug conversion, FC3S.org thermal bypass pellet, KVR Cross drilled rotors, complete Energy PU bushings, stainless steel brake lines/clutch line, Aerodyne shroud panel, Azenis RS, and some other stuff. A hybrid of sorts I guess

11-09-2002, 02:02 AM	#6
wherezmytofu BANNED Join Date: Nov 2001 Posts: 1,873 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (whitey_mb @ Nov. 08 2002,01:27)</td></tr><tr><td id="QUOTE">Hmmmm, could a bad valve cover gasket be the culprit? Mine is kinda messed up from when I polished the valve cover. Only thing is, that was a long time ago, and this idle problem hasn't been around nearly as long. I've been meaning to replace it. Is that silicone gasket maker stuff worth a damn? - Marty</td></tr></table><span id='postcolor'> the valve gasket should be a problem...most likely a vacumm leak..the ka is chain driven so the timing is most liky ok too.. has it just recently starting this...cuz colder weather does do that  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=''>

11-09-2002, 03:43 AM	#7
camppain Will never get banned... Join Date: Sep 2001 Location: San Diego CA Age: 45 Posts: 1,510 Trader Rating: (0) Feedback Score: 0 reviews	forget it its to late i'll re edit tomorrow if i remember __________________ -=-99 Sentra SE 5 speed-=- -=-95 240 SE 5 speed-=-

11-08-2002, 01:20 PM	#1
whitey_mb Join Date: Sep 2002 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	Hello all, I've already done a search, and couldn't find very much on my particular problem. I have a '96 5sp with about 77k miles on it. For the past few weeks, my idle had been kinda squirrly. It would be at a nice 800 or so, and then dip to 4-500, like I've read many of them do. Today, as I started accelerating from a stop at a light, my car gave a little shake, as if I had let the clutch out a little too fast. I looked down, and the check engine light was on. Everything felt and sounded normal as I drove around, though. At the next light, however, I noticed that my idle was now at a steady 1400 rpms. It stayed this way at every light from then on. Any suggestions? Could a simple tuneup be the answer, or does the check engine light mean something a little more ominous? Thanks in advance! - Marty

11-08-2002, 03:12 PM	#3
toddnappi Zilvia Junkie Join Date: Feb 2002 Location: NJ Age: 40 Posts: 439 Trader Rating: (0) Feedback Score: 0 reviews	You could have a vacuum leak somewhere, or need to clean your throttle body possibly. Todd

11-08-2002, 11:27 PM	#5
whitey_mb Join Date: Sep 2002 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	Hmmmm, could a bad valve cover gasket be the culprit? Mine is kinda messed up from when I polished the valve cover. Only thing is, that was a long time ago, and this idle problem hasn't been around nearly as long. I've been meaning to replace it. Is that silicone gasket maker stuff worth a damn? - Marty

11-10-2002, 03:54 PM	#8
whitey_mb Join Date: Sep 2002 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	Well, it looks like I spoke too soon about the idle staying high. It's all over the place now. I just checked the ecu, and it threw a code 25 - Idle control valve circuit open or shorted. Any suggestions? Thanks. - Marty

11-11-2002, 03:00 PM	#9
goodjuan Zilvia Junkie Join Date: Sep 2002 Location: San andreas Posts: 391 Trader Rating: (0) Feedback Score: 0 reviews	what's a code 25?