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Old 11-22-2016, 02:07 PM   #1
WaltNYC
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Default IACV - new, used, cheap, expensive?

My IACV is getting flakey. Have cleaned twice and is now spotless. Still have intermittent no idle problem. Runs great otherwise.

What is the 'value proposition' with these? Ebay has 'em from $10 and up. Looks like it might be a Jeep part as well. Can order from the UK for $35 - 360 as well as the various vendors here in the U.S..

Anybody have any experience replacing one?

err 4352 | eBay
http://www.ebay.com/sch/i.html?_from...+4352&_sacat=0
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Old 11-22-2016, 02:55 PM   #2
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Default Re: IACV - new, used, cheap, expensive?

https://discoweb.org/forums/showthre...referrerid=186

They're easy to replace.
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Old 11-22-2016, 03:07 PM   #3
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Default Re: IACV - new, used, cheap, expensive?

Stu, they are incredibly easy to replace. I'm just wondering if there is a meaningful difference between a $10 stepper motor and a $150 stepper motor other than have the Land Rover name attached to it in some way.
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Discovery I exploded parts diagrams....
http://www.allbrit.de/NAV.cfm?SPRACHE=EN&PAGE=491338
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Old 11-22-2016, 03:21 PM   #4
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Default Re: IACV - new, used, cheap, expensive?

That link includes the Jeep part numbers. I would just pick up one from whomever and run it.
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Old 11-22-2016, 05:59 PM   #5
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Default Re: IACV - new, used, cheap, expensive?

I just replaced mine two days ago with a unit from Autozone for $40. Reset the adaptive values, and she runs perfectly. The plug on the Duralast one is pointing toward the passenger side rather than up.
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Old 11-22-2016, 08:37 PM   #6
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Default Re: IACV - new, used, cheap, expensive?

Adaptive reset may cost more than the part..
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Old 11-22-2016, 08:52 PM   #7
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Default Re: IACV - new, used, cheap, expensive?

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Originally Posted by EricTyrrell View Post
Adaptive reset may cost more than the part..
It certainly will. Most dealers seem to be asking $125 for a reset. I got lucky. A friend of my boss has a Rovacom setup and did it for free. I tipped him $40 for his time.
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Old 11-23-2016, 09:47 AM   #8
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Default Re: IACV - new, used, cheap, expensive?

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Originally Posted by EricTyrrell View Post
Adaptive reset may cost more than the part..
Was wondering about this. Have gone over many threads and some say the reset will be needed, others suggested they just replaced the part and all was well.

Is there a way to avoid the reset? Would installing the new IACV with the pintle in the same position as that of the old IACV be helpful?
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RAVE in pdf:
https://drive.google.com/open?id=0By...FdyX1VQMS1iN00
Discovery I exploded parts diagrams....
http://www.allbrit.de/NAV.cfm?SPRACHE=EN&PAGE=491338
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Old 11-23-2016, 04:38 PM   #9
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Default Re: IACV - new, used, cheap, expensive?

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Originally Posted by WaltNYC View Post
Was wondering about this. Have gone over many threads and some say the reset will be needed, others suggested they just replaced the part and all was well.

Is there a way to avoid the reset? Would installing the new IACV with the pintle in the same position as that of the old IACV be helpful?
i've replaced mine twice on my '96 and needed no reset. just lucky, i guess.
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Old 11-23-2016, 06:40 PM   #10
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Default Re: IACV - new, used, cheap, expensive?

Not supposed to force IACV to change position, so hope you're lucky.
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Old 11-28-2016, 11:34 AM   #11
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Default Re: IACV - new, used, cheap, expensive?

In order to make this thread helpful....
I bought the new IACV from Napa (PART # :CRB 21856), pulled the pintle out as far as the old unit was, installed new and everything is back to normal. No re-flash needed. Lucky...for once.
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1997 Discovery I SE - 145k miles

RAVE in pdf:
https://drive.google.com/open?id=0By...FdyX1VQMS1iN00
Discovery I exploded parts diagrams....
http://www.allbrit.de/NAV.cfm?SPRACHE=EN&PAGE=491338
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Old 11-28-2016, 11:39 AM   #12
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Default Re: IACV - new, used, cheap, expensive?

Quote:
Originally Posted by EricTyrrell View Post
Not supposed to force IACV to change position, so hope you're lucky.
It's just a stepper motor right? Shouldn't hurt it. I'm surprised it doesn't self adjust anyway. The 14cux stepper bangs into the seat to zero out then backs out a set # of steps. You can hear it just after turning off the car. I thought I've heard the GEMS IAC do the same, but never had a reason to verify
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Old 11-28-2016, 02:54 PM   #13
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Default Re: IACV - new, used, cheap, expensive?

Don't know. Just relaying what the RAVE says. Glad he was successful.
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Old 11-28-2016, 08:17 PM   #14
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Default Re: IACV - new, used, cheap, expensive?

I slapped on one of the "Jeep" stepper motor's onto my 98 D1 a while back and it was idling at 2K, tried to match the exact position of the old one, but it would go right back up to 1200RPM to 2000RPM. I removed it and put my OEM unit back in vs paying 150.00 for a shop to reset it. I may try again since my friend has a 8500.00 Snap On Scanner, but I doubt it'll reset the adaptions on a GEMS LR. Only one way to find out though!
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Old 11-29-2017, 12:20 PM   #15
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Default Re: IACV - new, used, cheap, expensive?

I just cleaned the throttle body on my 02 D2 with CRC Throttle Body Cleaner. Can the same cleaner be used on the IACV?
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Old 11-29-2017, 02:38 PM   #16
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Default Re: IACV - new, used, cheap, expensive?

yep
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RAVE in pdf:
https://drive.google.com/open?id=0By...FdyX1VQMS1iN00
Discovery I exploded parts diagrams....
http://www.allbrit.de/NAV.cfm?SPRACHE=EN&PAGE=491338
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Old 12-06-2017, 07:08 PM   #17
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Default Re: IACV - new, used, cheap, expensive?

Curious observation. Adaptive reset? Sounds like hogwash. I work on boats for a living. Worked on cars before that, and before that I got an associates degree in automotive tech. I don't know everything but this sounds like nonsense. There's a period of time where the 6.2 and the 496 (GM world) all had IAC failures. I've literally replaced dozens of them. We keep two in stock at all times. They reset every time the key is cycled. As far as I know, all IAC valves reset with every key cycle.
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Last edited by Rob371; 12-06-2017 at 10:45 PM.
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Old 12-06-2017, 07:27 PM   #18
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Default Re: IACV - new, used, cheap, expensive?

I replaced numerous IACV units on my trucks, and never had to do anything beyond the physical part replacement.
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Old 12-07-2017, 08:23 PM   #19
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Default Re: IACV - new, used, cheap, expensive?

I have replaced my IACV many many times, and it always sounds like it's going bonker in there.
Is it supposed to sound loud, like a constant clacking/ticking?

I am very much interested in this.

Should I have been resetting the adaptive values? What does that actually do?

And what is the pintel? And why is it important to readjust it.

I know it's a lot, and for that I apologize, but to finally solve my IACV curiosity would be awesome.

just saw the part is for d1.
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Old 12-07-2017, 08:48 PM   #20
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Default Re: IACV - new, used, cheap, expensive?

I replaced the one on my 96 with the Jeep stepper. I remember changing the plunger stopper from my old one. It does reset itself when you turn the motor off and start it again. Never had to reset the adaptive settings. Worked great for what it is worth.
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Old 12-08-2017, 08:18 PM   #21
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Default Re: IACV - new, used, cheap, expensive?

Quote:
Originally Posted by gthphotography View Post
I have replaced my IACV many many times, and it always sounds like it's going bonker in there.
Is it supposed to sound loud, like a constant clacking/ticking?

I am very much interested in this.

Should I have been resetting the adaptive values? What does that actually do?

And what is the pintel? And why is it important to readjust it.

I know it's a lot, and for that I apologize, but to finally solve my IACV curiosity would be awesome.

just saw the part is for d1.
The clicking and clacking you describe may be your injectors firing. They can be audible. IAC (idle air control) is normally inaudible unless doing a key on, engine off test with scan tool. The IAC controls idle air flow. For the most part it is static but if ac compressor kicks on or you shift from park/neutral to R or D then IAC is going to compensate and adjust idle for the load on engine but only at idle. When throttle plate is closed there is no clearance around the plate to throttle body so no airflow around throttle plate. The IAC is a path around throttle plate. The pintle is part of IAC, basically a valve that is stepped in or out by IAC. In essence, it's an electronically controlled valve. Simply, the IAC is an electric motor controlling a valve referred to as a pintle valve or just as pintle. It adjusts airflow around throttle plate and compensates for engine load at idle.

Did I say the same thing like four times? Seems like it to me. Just trying to say it different ways and make it not confusing.
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Old 12-10-2017, 05:45 PM   #22
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Default Re: IACV - new, used, cheap, expensive?

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The clicking and clacking you describe may be your injectors firing. They can be audible. IAC (idle air control) is normally inaudible unless doing a key on, engine off test with scan tool. The IAC controls idle air flow. For the most part it is static but if ac compressor kicks on or you shift from park/neutral to R or D then IAC is going to compensate and adjust idle for the load on engine but only at idle. When throttle plate is closed there is no clearance around the plate to throttle body so no airflow around throttle plate. The IAC is a path around throttle plate. The pintle is part of IAC, basically a valve that is stepped in or out by IAC. In essence, it's an electronically controlled valve. Simply, the IAC is an electric motor controlling a valve referred to as a pintle valve or just as pintle. It adjusts airflow around throttle plate and compensates for engine load at idle.

Did I say the same thing like four times? Seems like it to me. Just trying to say it different ways and make it not confusing.
I appreciate it.

I understand the basic concept.

Unfortunatley, when I put my head up next to it, it's always clacking. I feel like the inside thingy doesn't sit still in it's position.
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