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Old 06-27-2010, 07:53 PM
2001I30MAX 2001I30MAX is offline
Enthusiast
2001 Maxima
2001 Infiniti I30
 
Join Date: Jun 2010
Location: Keystone State, PA
Posts: 40
Unhappy 2001 Maxima SE with High Idle Speed Problem

My previous situation
When I start the engine, (or when the engine is 'cold'), after a minute or two, it registers a norman idle speed (hovering over 700 to 800rpm) but after about 30 minutes of driving (when engine is 'hot'), say, while I am waiting for traffic light, I notice high idle speed (1000 to 1200rpm) in "Drive" and I have to press the brake harder than normal to hold the car. When I put in "Park", the rpm jumps to anywhere from 1800 to 2300 and stays there. It's been like this for about a month now and so far no SEL codes, although these sound like symptoms of P0505.


What I've done and none of below solved my problem.
Cleaned MAF sensor
Cleaned ThrottleBody (TB)
Replaced TB assembly(TB, TPS, IACV)-Since cleaning didn't work
IACV learning after the replacement
I still have 'High Idle Speed' problem.
This time, although improved a little, the idle hovering over 1800rpm appears after a while, say after driving more than 50miles. Or sometimes, idle bounces back and forth between 700 and 1800 when I put in "Park" after a long drive.
Any idea what the cause might be and what I can try next?
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