a little bit lower than normal?
what's the possible cause? clogged EGR ? thanks!

 

Got any codes?

Is the low idle something that just started recently?

Give us a little more info man.

 

its normal dude.

 

mine sets about 800-950 at idle and i thought that was kinda high for a 5 speed.

 

What I observe:

A/C off ~ 550-600 RPM
A/C on ~ 800-900 RPM

5 Speed

 

thats normal.. idle always goes up with ac on

to the OP

check/ clean idle control valves.. and set idle speed per sticky

 

no code, and mine is auto trans

I used to have a ford taurus v6, when I stopped on a slope, it will move up if I don't put my foot on brake. but for this car, I have to put on gas to hold on the slope. It seems that nissan has a weaker engine than ford.

 

my has the similar, but it drops to 500 from time to time, especially on a slope.

 

hell you say, you are

 

We all know hill holding is the ultimate test of engine power

 

no it isn't. Not 500rpm and not for an auto....

 

 

a few more words about this? EGR?

 

How would a clogged EGR guide tube (assuming that's what you're referring to, since you didn't mention anything specific) affect the idle speed? The EGR is not functional at idle.

Did the idle speed lower over time, or did it randomly happen? Did you do anything immediately prior to noticing the low idle?

Have you given a thought to properly adjusting the idle?

 

i have and i have an auto and it idles at 500

 

I have an auto. It did idle around 500 rpm in gear at a stop (no a/c). There was a slight vibration too. Higher idle and less vibration with a/c on.

I cleaned the MAF and that actually bumped up the rpm by 100 or so. Less vibration. I am considering adjusting the idle up another 50 or 100 to completely get rid of the annoying vibration while in gear. Checked the motor mounts and everything is good.

 

yeah, i will admit that the idle went down a little over the years. how often should you clean the maf??? my 95 does idle a little rough, but runs fine.

 

About EGR, a buddy on org took a look at my car and thought that might be a clogged EGR problem.

I just owned this car for 2 months, not sure what's the situation in the past. I just noticed it recently after I came back to atl where there are a lot of uphills and downhills. when the car stopped for light on a uphill, sometimes it can't hold position with gear on 'D', idle rpm was at 500. then I started paying attention to idle speed. it does this randomly, 30% of the time.

adjusting the idle speed? good point, but I need to make sure the low idle speed is a symptom of some malfunctions.

thanks for your input

 

I believe it's not cleaned in the last 60k, the previous owner did nothing to this car. I doubt he even changed oil in 3k.

 

might wanna fix that then.......

 

nothing to fix dave, its runnin fine as previously stated.

 

I would clean the MAF every time you change the air filter.

 

Auto idle should sit around 550 and 650 with no a/c. May have a slight IACV clog or a vacuum line may be leaking a little. Its such a small amount that I would just adjust the idle up a bit.

 

yeah, im sure at 195,000 miles that the engine runs a little rough even though i do an oil change every 2,000 miles. and, i have an k&n air filter which does need a cleaning and a respray. the idle is all the way up, so i need to do a throttle body clean out. tomorrow.

 

you said it idles rough...

 

I agree with the 550 and 650, but not adjusting the idle up just to cover up the problem. It could be costing you power, gas mileage, etc.

Myself, I have the same problem however, I think it may be transmission-related, as my CEL tells me something about my VSS (which I've replaced already) and something about a signal to the transmission computer.

 

welcome to the world of the p0400 code. Its a *****.


oh and a 50 rpm difference could be so many things. all of which really arent hurting the engine. Hell it could be a vacuum leak the size of a pin hole, the idle screw moved a tad, there could be a small bit in the IACV ect. Its not like hes moving it up 200 or anything.

 

...until it gets worse and you adjust it up again. IMO, fix the problem, it'll just get worse.

and isn't P0400 an EGR code?

 

Oh yeah thats right it is. Ive just ignored my cel for 2 years.

 

lol. Yeah, I get this feeling that one day my tranny will just explode because of this code. Oh well, it'll give me the opportunity to upgrade to a VLSD tranny from the I30.

 

Its the VSS code right.....I have that. Changed the VSS, cleaned and tighted down the terminals on the speedo. I dont think it will kill the tranny.

 

I have the VSS code as well on my 96 ECU. I say ecu because the ECU itself is the cause for the code...

 

I don't get your logic at all.

 

Yeah, it's not that one i'm worried about it's the signal to the transmission computer CEL that has me worried.