Question about 1997 Nissan Pathfinder
High idle on initial start then base idle to high (after cleaning the throttle body)
Low / uneven idle problem can cause by a lot of components.
Dirty air filter
Dirty injectors + o-rings
Vacuum leak at intake manifold and vacuum hose.
Bad Idle Air Control Motor (IAC)
Low compression (170 psi + is OK)
Start cleaning and repair these trouble spots and see is there any improvement.
For more advance DIY'er then you may try this.
Use a can of Berryman carburetor clean to locate the vacuum leak.
SEE SAMPLE PICTURE HERE
This is a 20-30 minutes job.
Vacuum leaks can occur in following locations.
Intake manifold AND/OR vacuum lines.
Intake manifold is not accessible unless the engine head if off.
You can still check the potential leak by spraying some Berryman near the intake manifold.
Listen for rpm increase after you introduce the Berryman (FUEL) at idle.
Do the same starting from the brake booster unit (the round unit) on the drive side fire all.
Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.
Get a friend to HEAR the ROM increase or monitor for RPM on the tech.
DO NOT AIM the Berryman into any heat source.
PLEASE RATE my answer if it is useful to you.
Posted on Dec 14, 2009
YOU have a gasket missing or leaking air or the idler vent hole has dirt in it
Take it off again and check it out but Dont use sealing glue of any kind to seal any part new gaskets is the only way to go...
Posted on Sep 24, 2009
Check for air leaks, broken gaskets then if all else checks out you can lower the idle by adjusting the idle adjustment screw. I think you use a 6mm wrench and a 2 mm allen key and adjust the screw under the throttle lever, DO NOT do this while running. A little bit goes a long way. Do the above post first.
Posted on Aug 18, 2012
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Posted on Jan 02, 2017
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