2004 nissan quest DTC P0507. Can't get IAVL to execute properly to correct high idle. Followed field procedure w/o use of CONSULT II Tool. Problem occured after replacing spark plugs at 97K mi. Had to disconnect and R&R TB to R&R plugs. NO vacuum leaks have been detected.
My quest 2004 idle below 500, start up then off, have to start couple times when the engine is cold. when i pushed the gas pedal, it smells gas.
Have the car re-learn the larger amount
of air volume that the modification creates, here is the procedure for doing this. It's
similar to the ECU clearing procedure:
1) Drive the car to "warm up" temperature. Make sure your idle is close to 700 rpm.
2) Ensure any battery draining devices are off. Ie. headlights, interior dome lights, HVAC,
stereo.
3) Turn the car ignition key to "OFF"
4) Wait ten seconds
5) Turn the key to "ON" (not start)
6) Wait three seconds.
7) Perform the following five times in five seconds or less. Fully press the gas pedal and
release.
8) Wait seven seconds from last of the five releases.
9) Fully press the gas pedal and hold down. Within ten seconds the "Service Engine Soon"
light should begin to blink.
10) Wait another ten seconds (while still holding the gas pedal) and the "Service Engine
Soon" light should stop blinking.
11) As soon as it stops blinking, release the pedal, start the car and check the idle
(should still be around 700 rpm)
12) Let the car idle at 700 rpm or so for about 25 seconds, rev the engine a few times and
then let it return to idle.
13) Shut the car down.
You car has now relearned the new air volume, which should be different than it was
(stock). You may notice a bit of a rough idle for the next 20 miles. This is normal and
will go away. The reason you should make sure idle is around 700 rpm (full warm up) is
because the car measures the air curve in relation to idle, so you don't want to confuse
it.
This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect the intake air system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.
If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds appropriately. Also check the PCV valve to see if it's blocked and needs to be replaced. Check the IAC (idle air controller) if equipped, verify it's operation. If available, try swapping in a new throttle body to see if that fixes the problem. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedures.
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