[azazel61]

Ok so I've had my supra for like 4 months now and am still unable to solve this idle problem, have come back to these forums numerous times for help but to no avail

I just got my car back from the mechanic who thinks it's the "idle stepper motor" causing the problem. I didn't even know there was an idle stepper motor... anyway he says it could be "sticking" which is causing the idle to fluctuate. He has quoted me AU$900 for a new one but first I want to know if anyone else has ever heard of this before? I have read nothing about the idle stepper motor in these forums.

I have already tried replacing spark plugs, a new idle air controller, cleaning throttle body and looking for vacuum leaks which there seems are none. I don't think it could be the MAF cause Jap supras don't have MAF's I don't think....

( 93 NA Supra - 5sp manual )

 

[KirkMKIV]

mine did the same thing and it was the idle stepdown

 

[azazel61]

so did you have to fork out for a new idle motor?

 

[White MKIV]

wtf is a idle stepper motor ... are you sure this guy isn't scamming you ???

 

[SintheticSupra]

its an electrical idle. when at low idle turn off the car then turn it back on it will go to normal(resets), if not then you got a bigger prob

 

[azazel61]

that's exactly what happens. if i turn the car off and on it goes back to normal. so it's definitely this idle stepper motor thing then ??

 

[SuPraonPs]

azazel61 Does your revs just drop under 500 and cause the car to shake an almost stall or what ?

 

[White MKIV]

azazel61 Does your revs just drop under 500 and cause the car to shake an almost stall or what ?

thats what mine does also !i tried taking that idle sensor off and cleaning it out with some cleaner shit.. didnt really do anything

 

[KameleonSupra]

I don't know if this will help at all but I had an idle problem after I put a K&N drop in filter in the stock air box. It would idle really low and stall sometimes at a stop. All I did to fix it was to take off the cover from the stock air box. Now it works great.

 

[Thomas Anderson]

How do you fix it though? My 95 does the same thing and once it stalls out and I turn it on ts fine. But that isn't the best way to fix it in my opinion. How can one theoretically turn the idle up electronically?

 

[SuPraonPs]

there could be a number of things contributing.
i'd first check to see if there are any wholes or leaks in your intake tubes. This could be causing unmetered air to be sucked in.
This thread might help you fix the problem.
http://www.supraforums.com/forum/showthread.php?s=&threadid=147464

 

[azazel61]

azazel61 Does your revs just drop under 500 and cause the car to shake an almost stall or what ?

sometimes it does that but lately it's been idling up over 1000rpm, sometimes even 1200rpm. if i turn off the car and back on it goes back to about 700 until i rev it again.

 

[KirkMKIV]

It's the idle stepdown - is the car throwing any codes? Mine didn't when the sensor went bad, Toyota diagnosed it and found out the problem and had it replaced

 

[Thomas Anderson]

I've done everything but have the sensor replaced, sounds like I am up shits creek....

 

[azazel61]

It's the idle stepdown - is the car throwing any codes? Mine didn't when the sensor went bad, Toyota diagnosed it and found out the problem and had it replaced

no codes - so there is an idle stepdown sensor? or is it the idle stepdown motor ? ive never heard of an idle stepdown sensor before