Idle increase randomly

[Astron Boy]

So I've noticed ever since the head rebuild that the idle will occasionally increase.

Starting the car up will sometimes require 2 turn overs, and it will sit an idle at 850ish rpm. If I am to drive it, every now and then I will notice on idle that it will be well up into the 1500rpm range. it may go back down, it may not.

I've recently done a service on it, including a set of iridium sparkies, everything done, minus the spark leads which are a bit trickier to source.
Just wondering if this is a TPS, ISC, temp sensors problem... not sure which one...

Any insight appreciated.

Oh, it doesnt nesesarily have to be after boosting it, I've driven it to or from like a baby off boost and same result..

 

[Astron Boy]

Sorry people, for whatever reason, it will not let me break this thing into paragraphs, just bunches the words into one long sprawl every time...

 

[mannynz]

check temperature sonsors, throttle and cable, power steering pump sensor.

 

[Astron Boy]

Power steering pump sensor?
That's a new one to me...

Why would that make a diff? And where is it located?

 

[mannynz]

there's a single wire with plug that connects to the power steer pump. see if that is plugged in.
I was told it detect fluid flow to indicate steering which then send signal to rise the rev.

 

[Astron Boy]

Yes, it's plugged in.
Will have to remove the temp sensors and all I suppose.

 

[to4garret]

interestingly, my rvr does this as well.

i was planning on looking into it this weekend. I have a feeling it will probably be ISC related as i noticed i dont get any "idle up" when the A/C switches on or when i turn the steering wheel while stationary.