Real Time Help - IAC valve

[CruisinGA]

I'm troubleshooting a no-idle condition on my '93. -Most likely culprit at this point is the IAC valve or something that controls it.

The IAC valve tests fine for continuity and resistance.

While running the operation test, (+12vdc to two terminals, sequentially grounding the others) I get responce for each terminal, but very little movement. I'm talking a total travel of maybe 2mm. It seems to me that this is not nearly as much as there should be. Does anyone know what kind of overall travel I should see?

I modified my IAC a few years ago for lower startup idle speeds, so I'm about to pull this guy apart and see what I can find inside, and undo what I did a few years ago.

Before I try and find a new IAC valve, anyone have any thoughts?


Bailey

EDIT: Scratch a new valve- this little guy apparently lists at $483 Thats two months of beer and pizza money for this college kid.

 

[CruisinGA]

I'm pretty suprised that no one had any input on this....

Doesn't matter cause I got it fixed.

Pulled the IAC valve of my mom's '97, compared it to my '93 IAC, got mine adjusted properly, cleaned and installed, and viola! I have an idle like I'm supposed to.

I was pretty relieved after getting the price on a new IAC.

 

[RavenTai]

it is a stepper motor, it makes a small movement every time you power one of the coils, to get it to move the full travel you woudl need to power each coil in succession.

 

[sseaman]

glad you got it fixes, i think alot of people were probably busy with the holidays as i was

 

[Romer]

Ummm Bailey, your mom called. She wants her IAC valve back.

Was it an adjustment or cleaning issue? I know you did both.

 

[CruisinGA]

it is a stepper motor, it makes a small movement every time you power one of the coils, to get it to move the full travel you woudl need to power each coil in succession.

I know... I read the FSM, and tested like the FSM details.

I was just suprised at how little overall travel the plunger makes.

 

[CruisinGA]

Ummm Bailey, your mom called. She wants her IAC valve back.

Was it an adjustment or cleaning issue? I know you did both.

Adjustment. Not sure why it quit working when the truck used to idle fine, but after "fiddling" with the valve for a long time and then finally just adjusting so that it looked like my mom's valve, the truck idles fine, a little low, but much better than no idle like before.

 

[RavenTai]

I know... I read the FSM, and tested like the FSM details.

I was just surprised at how little overall travel the plunger makes.

the total travel should be a lot more than 2mm, did you do them in the right order? each sequence is one revolution, it takes many sequences to reach the full travel

 

[CruisinGA]

I tested my mom's '97 IAC, and it was the same as my '93, very little overall movement.

If you test it like the FSM details, there is only 4 positions of the plunger, and when you go back to the first pin, it "resets" to the original position.

Maybe I'm missing something?

 

[RavenTai]

I tested my mom's '97 IAC, and it was the same as my '93, very little overall movement.

If you test it like the FSM details, there is only 4 positions of the plunger, and when you go back to the first pin, it "resets" to the original position.

Maybe I'm missing something?

I don't know, it has been a wile but when it did it each sequence got one revolution of the threads, witch is what it sound like what you got, but then you do it again and there is another revolution on the threads and it is that much further, reverse the order and it goes the other way. total travel was something like 1/2" or so (been a wile) but was more than just 2mm, any way if you got a full rev out out of it then all the coils must work.