i noticed lately at red lights and crusing in neutral my idle is at about 500-550, it used to be about 700 (where it should be). i got new plugs and coils about 7K ago and new MAF about 3K ago, so that sould eliminate those factors, and this just happened now, so what could be the cause other than a dirty TB?? any input? thanx.

 

i just had this problem, my tb was fine, they had to change 2 o2 sensors and a heat sensor but that wasnt part of the problem they were just throwing codes. I had to change the air compressor, the like black tube part that the MAF plugs into, that and clean the intake filter cause it was very very dirty

 

SEA FOAM it !!!!!!!!!!!!!

 

Try Idle Air Volume Learning...


PRE-CONDITIONING
NFEC0642S02
Before performing “Idle Air Volume Learning”, make sure that all of
the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are
missed for even a moment.
I Battery voltage: More than 12.9V (At idle)
I Engine coolant temperature: 70 - 99°C (158 - 210°F)
I PNP switch: ON
I Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime running light systems, set
lighting switch to the 1st position to light only small lamps.
I Cooling fan motor: Not operating
I Steering wheel: Neutral (Straight-ahead position)
I Vehicle speed: Stopped
I Transmission: Warmed-up
For A/T models with CONSULT-II, drive vehicle until “FLUID
TEMP SE” in “DATA MONITOR” mode of “A/T” system indicates
less than 0.9V.
For A/T models without CONSULT-II and M/T models, drive
vehicle for 10 minutes.



1. Start engine and warm it up to normal operating temperature.
2. Check that all items listed under the topic “PRE-CONDITIONING”
(previously mentioned) are in good order.
3. Turn ignition switch “OFF” and wait at least 10 seconds.
4. Start the engine and let it idle for at least 30 seconds.
5. Disconnect throttle position sensor harness connector (brown),
then reconnect it within 5 seconds.
6. Wait 20 seconds.
7. Make sure that idle speed is within specifications. If not, the
result will be incomplete. In this case, find the cause of the
problem by referring to the NOTE below.
8. Rev up the engine two or three times. Make sure that idle
speed and ignition timing are within specifications.
ITEM SPECIFICATION
Idle speed M/T: 625±50 rpm
A/T: 700±50 rpm (in “P” or “N” position)
Ignition timing M/T: 15°±2° BTDC
A/T: 15°±2° BTDC (in “P” or “N” position)
NOTE:
If idle air volume learning cannot be performed successfully,
proceed as follows:
1) Check that throttle valve is fully closed.
2) Check that downstream of throttle valve is free from air
leakage.
3) Adjust closed throttle position switch and reset memory.
(Refer to Basic Inspection, EC-113.)
4) When the above three items check out OK, engine component
parts and their installation condition are questionable.
Check and eliminate the cause of the problem.
5) If any of the following conditions occur after the engine
has started, eliminate the cause of the problem and perform
“Idle air volume learning” all over again:
I Engine stalls.
I Erroneous idle.
I Blown fuses related to the IACV-AAC valve system.

 

unless the ECM was reset or something drastic happened with the adaptive strategy, he shouldnt need an idle volue relearn... it couldnt hurt but clean the TB and you might be looking at an iac.

 

The Nissan ESM has this listed as a procedure for problems with idling...

Idle Air Volume Learning
NFEC0642
DESCRIPTION
NFEC0642S01
“Idle Air Volume Learning” is an operation to learn the idle air volume
that keeps each engine within the specific range. It must be
performed under any of the following conditions:

Each time IACV-AAC valve, throttle body or ECM is replaced.

Idle speed or ignition timing is out of specification.

 

exactly. 132456

 

Damm someone copied the ESM from work huh ??

 

funny, i was thinking the same thing