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+--- Thread: Idle issue on an 89 sidekick 8v (/thread-idle-issue-on-an-89-sidekick-8v)
RE: Idle issue on an 89 sidekick 8v - fixkick - 04-13-2019
no other cars IAC valve will work on you car, over 300 listed at SMP.(top maker) (due to custom fittings and custom flow rates for engine displacements)
On the wild side is this way: ; The Custom ECU guys do this all the time.
but this can work, (this is the Jeep adapter, used on race cars with full custom fuel controls)
https://www.diyautotune.com/product/custom-idle-air-control-body-for-use-with-jeep-4-0l-iac-valve/
with this and the SMP valve for jeep 4L that fits, can be connected to a control computer (simple processor) and the controlled using voltage from your ECT sensor.
you would have to program all to make it work like the OEM IAC.
even the cheap, computer called ARDUINO can do this a $20 processor board. with some programming, and maybe a driver chip for the jeep IAC motor.
AC130 valve 1992.?
smp AC151 same
https://www.rockauto.com/en/moreinfo.php?pk=46666&cc=1180112&jsn=390
off 92 jeep cherokee, 4.0L inline 6. (called auxiliary air valve)
here is how it is done. (lots of stepper motors used, making the drive electronics and software complex but can be done) but the jeep version has aux base adapter block.
http://www.megamanual.com/ms2/IAC.htm
and last a chip on a card that may operate this, IAC motor. ;finding SMART chip that can run a motor like this would make the project super easy.
https://lastminuteengineers.com/a4988-stepper-motor-driver-arduino-tutorial/
the popularity of 3D printing , makes more IDEAS , more common today. and lots of stepper motors there are.
and this
https://medium.com/jungletronics/easydriver-4-wire-stepper-motor-driver-9f32b233efe6
and the chip, how it works and why it makes the job more easy, datasheet, chip
so the parts need are the Arduino, the stepper IAC motor , jeep, and the control car and last benching testing the IAC motor to be sure all angles IAC can be done.
one problem see the 88 jeep (I had and sucked) was the motor would stick a zero, valve closed, not matter what you did. (cleaning it every 10k, miles yes)
the 91 model stepper motor cured this , with a larger motor (thanks to jeep new design)
I'd test the valve so I can reach 0 flow to max flow.
then in the car try which settings work best, on 10 cold engine settings, say from 0F to 149F.
then make a table that has those hand collected facts.
The table is indexed by ECT voltage and the table shows how many hits to the controller gives you the RPM you want.
What amazes me is why nobody block boxed this all up for race engine builders.
A user would just make the table, and it runs all by its self no ECU needed at all.
why did Suzuki, not force the existing ISC solenoid air valve (PWM) to do this whole job, that most if not all cars did latter.
The answer is the PWM valve lacks a large enough dynamic air flow range... to do the job from Alaska to death valley,Ca. start up temperatures.
And suzuki weak slow , cheap CPU lacks the code space and speed to run a stepper motors, complex code. (and the lack of stepper chips ! in 1988 to say 1998)
RE: Idle issue on an 89 sidekick 8v - Freaky Beanie - 04-15-2019
Yes, it's an amazing tool to have handy in the garage
I will do the heat test again without the putty in the IAC.
I will do those tests this week when I get more time.
(04-13-2019, 01:39 AM)fixkick Wrote: the FLIR shows all is good, heat wise. nice way to test this. FLIR.
if the IAC is roasting hot like the FLIR shows, the IAC is bad if it leaks air, so adjusting it is ok, (nothing to loose only gain)
and thanks very much for sharing FLIR here,
It is shame the IAC can not be removed like the 16valve has.
good luck to you!~