Ok so recently I have had a little bit of a hunting/surging idle while the car warms, if i push the clutch in it stops surging. Once it is at full operating temp. the idle remains high, about 1250 ON THE TACH. If I push the clutch pedal in it will drop to "normal", about 800 or so on the tach.

what do you think- should i be looking into a new clutch? or do I have a bad neutral switch?

 

With no engine codes? There is a lot of answers for that question. A Throttle body gasket leaking air? That wouldn't set off a code...

 

interesting.

more info. yesterday evening when i was out driving around for a bit (getting on it a bit more than usual as i was alone in the car) i didnt have the surging at all AND when i was at some lights the idle was NORMAL instead of high.

today it was half and half. the first half(ish) of driving around today it was high unless i put the clutch pedal in but later it was idling normally.

 

Weird...
When you have these problems, can you still use Cruise Control?
This will eliminate the switch on the clutch pedal (not the interlock switch).

You can test the neutral switch if you like:
https://www.rx8club.com/series-i-do-yourself-forum-73/diy-test-neutral-reverse-switch-200453/

 

Well other than a leaky throttle body gasket, there is the ecm option. Did you ever AP your ecm? There could be a computer glitch that has your idle running at warmup settings all the time.

 

You sure you were in your 8 and not your Prius Zoom? :P

 

cruise is fine

no computer clitch

i dont have aprius

 

It sounds like the problem I have in the winter with the neutral switch. BTW, if you plan on replacing it, the size wrench is 27mm ($18 at Sears/Craftsman).

 

yeah im thinking so too. looks like ill have to borrow the neighbors jack stands

 

I don't think the neutral switch would cause surging. That's just me though.

Page 68 in the FSM engine problem section has more info.
Measure voltages at PCM terminal 4w, 4z, 4f, 20.

If PCM terminal 4f voltage is not as specified inspect CPP switch

Page 281 of the engine details sections gives you instructions on how to test the CPP unit.

Good luck. Let us know what ya find yea?

 

neutral switch can cause surging in the idle, I had it happen and the tach kept bouncing around a few hundred rpm.

zoom: what's this about you borrowing your neighbor's jack stands. You don't have your own?! n00b.

 

yeah it will. ive known it could for 4-5 year now.the pcm is basically "confused" about which map to use

well he already owns them(he's rehabbing a vw bus), so.....he owns a lawn edger to ... kinda like buying wheels... i mean you already have the ones i want so.... ill just borrow yours

 

It would throw a lean AFR code.



Sounds like the neutral switch to me.


I had this problem you described for a few months. Sometimes would throw the code for the neutral safety switch, sometimes it wouldnt.