Anyone had idle issues like this??

Big J · 04-20-2013, 02:59 AM

Mine has been doing this for a while now. Base 370z. Took it to the dealer and they wouldn't do anything bc it wouldn't do it at that moment. Odd enough, when mine revs up, if I hit the floorboard(or whatever is down there) behind the gas pedal with the side of my foot. The rpm's drop immediately most of the time

Big J · 04-20-2013, 03:04 AM

Ohh, and mine will rev up while in neutral to over 2k rpm's and just sit there or go higher, normally no higher than 3k though. If its reving up and I engage the clutch, the rpms shoot down immediately but jump right back up with I push the clutch pedal back in.

N0SL3N · 04-20-2013, 08:01 AM

Quote:

Originally Posted by Big J

Ohh, and mine will rev up while in neutral to over 2k rpm's and just sit there or go higher, normally no higher than 3k though. If its reving up and I engage the clutch, the rpms shoot down immediately but jump right back up with I push the clutch pedal back in.

How does the engine sound at idle? This sounds like a vacuum leak and vacuum leaks usually cause a rough idle. You can try doing a smoke test or just visually inspect everything.

One other suggestion is to clean your throttle bodies (really easy) and then perform all of the relearns as this usually helps with idle and throttle response.

YOUCANTZME · 04-21-2013, 12:26 PM

Quote:

Originally Posted by chrischhorn

The surge, I have no idea whats causing it but it sounds like a vacuum leak. As for the hanging RPMs at shifting, our throttle does have a slight delayed response. Unlike cable throttle cars where you press the clutch as you let off the gas and the RPMS immediately drop, ours you let off the gas, then you press the clutch about half a sec to a full sec later and your RPMs will drop normally and won't hang. Atleast that's what I learned with mine lol.

By the way, clever forum name but you've already Z'd yourself

Lol, been using that name for 15 years since I had my old Z, just kind of stuck and I figured it's still kind of relevant here...lol. Strangely enough, I haven't noticed the surging as much with the "S mode" disengaged. It still happens periodically but not every stop light as before. I didn't know that about the clutch. I really hope there is indeed something wrong with mine. I would hate to think this is how it is supposed to shift. If I was really going through the gears all the time, I could probably deal with it, but most of my driving is in town, stop and go stuff. I can't make a smooth shift at all, unless I wait about 3-4 seconds between each shift for the rpm's to come back down....and that's no fun at all (at least for me it's not).

YOUCANTZME · 04-21-2013, 12:36 PM

Quote:

Originally Posted by Big J

Ohh, and mine will rev up while in neutral to over 2k rpm's and just sit there or go higher, normally no higher than 3k though. If its reving up and I engage the clutch, the rpms shoot down immediately but jump right back up with I push the clutch pedal back in.

Man, that sounds exactly like what my old Z used to do (it was a 93tt). I took that thing to the dealer numerous times and they could never find anything wrong. I ended up taking it to a local mechanic and he found a vacuum line off (he said it was extremely hard to find because of it's location, well hidden) and he also cleaned the throttle bodies like NOSL3N just said. It fixed 90% of the problem. Not really sure if these cars are built anywhere similar but figured I'd throw it out there for ya. Good luck!!

Big J · 04-21-2013, 04:35 PM

I've looked a few times but will look again for a leak. It's been doing it for a while now but its not every time the car comes on. its only every now and then but frustrating bc my car is so loud and it does it sometimes when I'm in a parking lot or at a red light.

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04-20-2013, 02:59 AM	#16 (permalink)
Big J Track Member Join Date: Jun 2010 Location: Memphis Posts: 905 Drives: 370z Rep Power: 16	Mine has been doing this for a while now. Base 370z. Took it to the dealer and they wouldn't do anything bc it wouldn't do it at that moment. Odd enough, when mine revs up, if I hit the floorboard(or whatever is down there) behind the gas pedal with the side of my foot. The rpm's drop immediately most of the time

04-20-2013, 03:04 AM	#17 (permalink)
Big J Track Member Join Date: Jun 2010 Location: Memphis Posts: 905 Drives: 370z Rep Power: 16	Ohh, and mine will rev up while in neutral to over 2k rpm's and just sit there or go higher, normally no higher than 3k though. If its reving up and I engage the clutch, the rpms shoot down immediately but jump right back up with I push the clutch pedal back in.

04-21-2013, 04:35 PM	#21 (permalink)
Big J Track Member Join Date: Jun 2010 Location: Memphis Posts: 905 Drives: 370z Rep Power: 16	I've looked a few times but will look again for a leak. It's been doing it for a while now but its not every time the car comes on. its only every now and then but frustrating bc my car is so loud and it does it sometimes when I'm in a parking lot or at a red light.