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cleaned TB and AICV now car is jumpy

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Old 11-22-2005 | 07:56 PM
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cleaned TB and AICV now car is jumpy

i had some rough starts so i tought is clean the tb and aicv. put evrything back together, adjusted the tps (500-4000) and now when im in first around 2-3k rpms the car would just jerk and jump the rpms even though my gas is steady?? what could have gone wrong??
Old 11-22-2005 | 08:23 PM
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I had a similar problem
Try changing the MAF
Old 11-22-2005 | 08:39 PM
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adjusted the TPS?!

thats what you did wrong. you can try an idle learn procedure, however, id adjust the TPS back.
Old 11-22-2005 | 08:50 PM
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Originally Posted by BewstAdd1ct
adjusted the TPS?!

thats what you did wrong. you can try an idle learn procedure, however, id adjust the TPS back.
i did adjust the tps set it to .500 at idle and 4.000 at WOT. why would i adjust it back, and back to what??
Old 11-22-2005 | 08:52 PM
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i missed the decimal in your original post, i didnt realize you were using a scan tool to adjust it. 'back' would mean back to where it was from the factory. theres almost never a reason to adjust it, and adjustment is ususally provided for replacement purposes.

try the idle learn procedure. maybe youll get lucky...
Old 11-22-2005 | 09:05 PM
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ohhh, just realized i forgot to metion...i didnt reinstall that black plate that goes between the tb and manifold (and into manifold) it looked completly pointless and resrticted air flow by about 2mm. but i cant imagine that would cause any problems.

and how do u do the ilde learning procedure?
Old 11-27-2005 | 10:13 AM
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hmm, ive never removed the throttle body so im not familiar with what yourea tlaking about... but did you replace the gasket, or did the gasket look okay. ck for a vacuum leak at the t/b to I/M.

the idle learn procedure is in the stickies, IIRC. ill pull it from the svc manual for oyu...
Old 11-27-2005 | 10:15 AM
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Do the one that says 'without consult-II'

DESCRIPTION
"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.
PRE-CONDITIONING
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.


Battery voltage: More than 12.9 V (At idle)
Engine coolant temperature: 70 - 99°C (158 - 210°F)
PNP switch: ON
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.


Cooling fan motor: Not operating
Steering wheel: Neutral (Straight-ahead position)
Vehicle speed: Stopped
OPERATION PROCEDURE
















With CONSULT-II


Start engine and warm it up to normal operating temperature.
Check that all items listed under the topic "PRE-CONDITIONING" (previously mentioned) are in good order.
Turn ignition switch "OFF" and wait at least 10 seconds .
Start the engine and let it idle for at least 30 seconds .
Select "IDLE AIR VOL LEARN" in "ACTIVE TEST" mode.
Touch "START' and wait 20 seconds .
Make sure that "CMPLT" is displayed on CONSULT-II screen. If "INCMP" is displayed, "Idle Air Volume Learning" will not be carried out successfully. In this case, find the cause of the problem by referring to the NOTE below.
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)






Without CONSULT-II


Start engine and warm it up to normal operating temperature.
Check that all items listed under the topic "PRE-CONDITIONING" (previously mentioned) are in good order.
Turn ignition switch "OFF" and wait at least 10 seconds .
Start the engine and let it idle for at least 30 seconds .
Disconnect throttle position sensor harness connector (brown), then reconnect it within 5 seconds .
Wait 20 seconds .
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.
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:


Check that throttle valve is fully closed.
Check that downstream of throttle valve is free from air leakage.
Adjust closed throttle position switch and reset memory. (Refer to Basic Inspection.)
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.
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:
Engine stalls.
Erroneous idle.
Blown fuses related to the IACV-AAC valve system.
Old 01-02-2006 | 11:40 AM
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Cleaned your IACV? What about EGR? anyway, if idle air re-learning process doesnt fix your foible, clean out the EGR as well. If you're still jumping in second gear, have a Nissan PROFESSIONAL undo your work and just take the stab in the wallet.

P.S. Your TB plate removal might also be interfering with the Karmann frequency by creating unexpected air turbulence in your IM.
Old 01-02-2006 | 12:36 PM
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Originally Posted by L0R1DA
Cleaned your IACV? What about EGR? anyway, if idle air re-learning process doesnt fix your foible, clean out the EGR as well. If you're still jumping in second gear, have a Nissan PROFESSIONAL undo your work and just take the stab in the wallet.

P.S. Your TB plate removal might also be interfering with the Karmann frequency by creating unexpected air turbulence in your IM.
the problem turned out to be the tps. good thing i made a mark of its original position before disassembly, because when i put it back together, i set it to 500 ohms at idle (which was what i was told and read in haynes manual), a nice guy at nissan told me it has to be set to .5 volts instead, so i did that, it helped but didnt fix it alltogether. so i set it to its original posittion (turned out to be about.64 volts and problem fixed.

still not sure whatb that tb plate does, but its out for now.
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