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What's wrong with my P11? - IAC issue??

1567 Views 7 Replies 4 Participants Last post by  Kingart813
I've been trying to fix/diagnose my 5-speed 2001 P11.

First, I noticed one day as I was putting it in park, the car was idling kind of high. Oscillating slightly. I turned it off, and when I came back to start it up it went away.

About a week later same thing happened as I was pulling into my driveway. Only worse and then I got a check engine light. I didn't have a OBDII scanner, but I ordered a WiFi one that I could use with the DashCommand app for iPhone/iPad.

I worked on the car that week-end with the battery unplugged and it cleared the code. Check Engine Light hasn't returned but problem persists. Car only does this in neutral or low gears.

From my research, I'm leaning towards the IAC as this is a well known issue for 2000-2001 Nissans, however I'm not getting the P0505 code. I also took out the ECM and the board looked fine i.e. it wasn't fried.

What do you guys think about cleaning the IAC? Also, if I remove the IAC to clean it will I have to do an Idle relearn?

I don't just want to start replacing parts and sensors willy nilly.

Here's what I've done so far:

Replaced Cap and Rotor (Didn't initially change the spark plug wires because the resistance was still good, but I'm going to anyway)
Cleaned Throttle Plate really good with a wire brush
Cleaned MAF
Replaced O-Ring on Distributor
Removed ECM to check for fried components
Disconnected MAF and started car to check MAF
Disconnected TPS and started car to check TPS

Video of idle issue:

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Another Dashcommand app video:

whats wrong with your 5 spd p11 you noticed a problem while putting it in park ....which gear is park on a 5 spd
whats wrong with your 5 spd p11 you noticed a problem while putting it in park ....which gear is park on a 5 spd

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lumierephoto dont get mad because you fail at explaining things correctly
I had a similiar problem at around that mileage, my idle would rev and drop, and it turned out to be my motor mounts... when was the last time you checked those?
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