G35 Coupe V35 2003 - 07 Discussion about the 1st Generation V35 G35 Coupe

RPM Low when Idle

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Old Dec 21, 2010 | 11:14 AM
  #16  
ZeRo G35's Avatar
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I did clean the MAF and throttlebody and now the RPM at idle is a bit higher. At first, I thought it would drop down as it tends to (since it is cold here). It basically stayed at 1k RPM the entire 30 minutes. This morning driving, I do not notice anything strange but the RPM did drop back to about 600k at idle, but the sound is still there... like its sputtering... and bout to shut off...

I will try again next week with the full process... but does anyone know if there is any belts that cause this? I replaced my clutch a few weeks ago and they mentioned i needed new belts (but did not specify)... and stupid me did not even think to ask what belts!!!
 
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Old Dec 21, 2010 | 08:48 PM
  #17  
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anybody check for a vacuum leak...that can also cause a low/rough idle...sometimes ppl take things off to clean or replace and forget to hook up a small hose.....
 
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Old Dec 21, 2010 | 10:34 PM
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might have to replace the entire TB
 
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Old Dec 21, 2010 | 10:53 PM
  #19  
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I would complete the whole reset process. Once all active learning is reset see if the ecu throws you a code.

I doubt the belts would cause this stutter.
 
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Old Dec 21, 2010 | 10:57 PM
  #20  
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I would not focus on the intake manifold anymore if the idle is good.

I would be paying more attention to the spark plugs, fuel filter, igniter module, distributor cap and rotor, ignition coil .... those types of things.

how much mileage does your g have? for the cluth to be replaced must be high ...
 
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Old Dec 22, 2010 | 09:34 AM
  #21  
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I replaced the clutch at 65k miles. I can tell it was going out soon.

I will have to look into other options out there either.

Not being the best mechanic (most of the knowledge learned from here and my previous car on maxima.org), I will try to look into the things I can do myself such as changing spark plugs, evaluating the hoses for leaks.

To me, the car sounds pretty loud at idle... engine making a decent amount of "noise" like if something is spinning in there. It's not the same noise as if it was a new car... so im trying to see if there is a relationship with the belts, motor, noise to my idle that is low.

Thanks all for the inputs. Will replace a few more things this weekend and do some checkup work to see if I can solve this issue.
 
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Old Dec 22, 2010 | 10:01 AM
  #22  
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mine is an 04 wit 47k miles and im having the same problem..my g was in the garage yesterday and i started it the rpms went up to like 1200 which i think is normal for warmup then dropped all the way down that my lights came on like i stalled but it caught it self..and my idle does the same like its going to stall then it catches.i checked for vac leaks there is nothing i can see i hope the throttle body doesnt need to be replaced cuz i just had to replace my 03 sedans like 3 months ago
 
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Old Dec 25, 2010 | 08:45 PM
  #23  
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damn my car is doing the same thing.. it wants to stall at lights..
its kinda scary.. but when im driving it drives fine, and is very powerful...
it sucks!

but then again, i do have oil leaking into my spark plugs from the valve cover gasket.
FML
 
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Old Jul 17, 2011 | 12:50 PM
  #24  
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Are the instructions to reset the Ecu applicable to a 6 speed 05 sedan?
 
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Old Dec 20, 2011 | 05:56 PM
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Has anyone found exact issues as to why our cars idle so low?

I just changed my oil,cleaned MAF sensor, and TB.

Car seems to start a lot better. Before, it would barely start up as if the battery were dead.
The idle seemed to be better when i first started it, but has since been at 200rpm idle.
 
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Old Dec 20, 2011 | 06:37 PM
  #26  
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Well 650 is around normal idle. But it also depends if its a cold start or not...and +1 for Tim always helping out
TIIIIIIIIIIIMMMMMMMMMMMMM xD
 
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Old Dec 20, 2011 | 08:28 PM
  #27  
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Well im not sure when this started, but I do live in AZ and it has gotten pretty cold as of the past month.
its between about 55 during the day and 35 at night..

The car does still idle around 200-250rpm cold or not..

I just had my battery checked and it was bad.Replaced it and car starts up just fine, but still idles at 200+

Any other suggestions? I'm trying to get this figured out because it scares me seeing it at 200rpm

car is at 88,500miles
 
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Old Dec 20, 2011 | 08:42 PM
  #28  
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250 rpm's is like unreal low lol. you might need to go look at your tach again because it does apear to be 250 but its probably around 500 due to the fact that the 0-1000 rpm is staggerd non equally threw the rpms range. my car has 100k miles and its been doing it since i got it at 60k and i beat on it really good. never had a problem and still makes good power.
 
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Old Dec 20, 2011 | 10:47 PM
  #29  
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500 is the normal idle.
With AC on the idle is 900.
 
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Old Dec 21, 2011 | 01:16 AM
  #30  
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^i'll see where it's at with A/C..not sure if i will see a difference
 
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