Idle air controller compatability
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Post by ES_97Sport on May 28, 2014 17:49:41 GMT -5
At the risk of ridicule, I bought an aftermarket IAC on ebay for $49 with a "lifetime" guarantee. At that price what could I lose when OEM controllers were running in the $250-$300 range. Truck is running like new. I'll see how long it lasts, but wow what a difference. It had been dying at every stop in stop-and-go traffic on I5. Oh, yea. The IAC will make your life miserable. The original on my little '97 started going south about a month ago. What a PITA. Idles all over the place and its harder to start, too. Thankfully I'm not at the 'dying' stage. :rolleyes: BTW, OEM prices seem to have gone down. I had them quote me one a couple weeks ago and it was about $170. Yea, about $100 less than the crazy 250/270 to 300 it has been. The worrisome thing about using the cheap China IACs is that the stepper motor circuits go DIRECTLY into the ECM/PCM. If something shorts - and that can happen with an IAC - it can fry the ECM/PCM before you can blink. Edward
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Post by bdmontero on May 28, 2014 18:13:32 GMT -5
It's like static discharge on an ipod touch, NOT COOL.;D Sent from my SM-N900V using proboards
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Post by ES_97Sport on May 28, 2014 18:49:21 GMT -5
It's like static discharge on an ipod touch, NOT COOL.;D Sent from my SM-N900V using proboards LOL!! Exactly! Edward
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Post by dclambertt on May 30, 2014 16:21:20 GMT -5
Yeah but DSMIAC doesn't sell IAC's for a 2001 Montero Sport Ltd., at least that's what they told me. Their website reads as if they have them, but mine has three mounting bolts and the model they show has two. They do say that the IACs they carry will fit a 3.5 engine, which mine is.
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Post by ES_97Sport on Jun 2, 2014 13:37:31 GMT -5
Yeah but DSMIAC doesn't sell IAC's for a 2001 Montero Sport Ltd., at least that's what they told me. Their website reads as if they have them, but mine has three mounting bolts and the model they show has two. They do say that the IACs they carry will fit a 3.5 engine, which mine is. DSMIAC only has the 'old style' for the '97-'99 3.0L LS Sport. I'm not sure but I think the '00-'01 is incorrect. Far as I know the TB assembly (including cruise) on the 3.0L Sport changed in '00 which uses the new 3 screw IAC. The '99 3.5L is a Limited and I believe uses the exact same setup that the 3.5L '00-'05 uses. I've never checked and I don't have my '99 3.5L anymore to look at. If I remember I'll look at my '99 service manuals tonight. The Montero/Pajero and Sport stuff is generally identical but there are some year discrepancies so you can't assume if it fits a Montero/Pajero it'll fit a Sport as long as you have the year correct. For instance, the '97 Sport (FED/CAL) supports fuel tank pressure and associated evap solenoid, but the '97 Montero ONLY has these two emission do-dads for the CAL version. Monteros didn't have the full emissions that the Sport did until '98. Edward
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Post by petero on Jun 2, 2014 16:21:11 GMT -5
I've got a '99 3.5L limited sport, and it uses the same IAC as the 3.5L engines from later years. Part number is MD628119, and it's got the three mounting screws. As I said above, I bought a $40 replacement off ebay a while back. In every way, it looks identical to the OEM model, but I could never get it to work. It was stuck idling above 2000 rpm, and immediately threw a P0505 code.
I'm still looking for a replacement, but I can't find an OEM unit for less than $350. Edward, have you found these OEM IACs for 3.5L engines for less $$ somewhere? I'm not motivated to spend the money right now, since my sport is running perfectly, but just throws a P0505 code once a week, like clockwork. Weird.
--Peter
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Post by ES_97Sport on Jun 4, 2014 14:50:17 GMT -5
I've got a '99 3.5L limited sport, and it uses the same IAC as the 3.5L engines from later years. Part number is MD628119, and it's got the three mounting screws. As I said above, I bought a $40 replacement off ebay a while back. In every way, it looks identical to the OEM model, but I could never get it to work. It was stuck idling above 2000 rpm, and immediately threw a P0505 code. I'm still looking for a replacement, but I can't find an OEM unit for less than $350. Edward, have you found these OEM IACs for 3.5L engines for less $$ somewhere? I'm not motivated to spend the money right now, since my sport is running perfectly, but just throws a P0505 code once a week, like clockwork. Weird. --Peter Yep, that's what I thought. Sounds like the ECM/PCM thing. The '99 3.5L uses a PCM which everything switched to in '00, but the others still used an ECM. Eeak. Electrical things that tie directly into the computers always make be really nervous. I've heard too many horror stories of replacing something and frying the computer. I talked to the dealership about three weeks ago or so and if I remember right they quoted me about $180 for the IAC on the Montero and Montero Sport 3.0L. The one on DSMIAC's site. I'll check with them tomorrow and see what they say about the one for the 3.5L. I hesitate to suggest this, but if you're REALLY, REALLY strapped for cash, try the salvage yards. I've seen the occasional really clean vehicle that I might trust the IAC out of. However, you might want to read this before doing anything if it idles the way it should. IACEdward
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Post by dclambertt on Jun 11, 2014 16:52:26 GMT -5
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Post by ES_97Sport on Jun 12, 2014 13:10:04 GMT -5
Yea, that used to be the point of going with DSMISC. They were selling the new part were the dealerships were still selling off Mitsu's old stock of the original part. Now that the old stock has been exhausted, all the dealerships sell the new part, so .... It should work fine initially. The question is how long it'll last and what happens when it dies. There are four circuits that feed the stepper motor coils directly from the ECM/PCM. A1, A2, B1 and B2. The new IAC was slightly redesigned to make it less prone to fry the ECM if there was a problem with the IAC. Whether the aftermarket stuff uses the original design or the new design would be something to know. I like Chinese electronics less than their mechanical crap. I have a MAP for my '97 that seems to work perfectly fine about 95% of the time. No CEL, no stored codes, nothing. But, when it flakes out it really flakes out. Same with the O2 sensors I used to run. Seemed to work fine most of the time, but once in a while would pop the P0125 code. Replace it with a new one and it'd be fine for a while and then right back to the same behavior. And, they never lasted nearly as long as the factory O2 sensors, either. I totally zoned getting prices when I was in day before yesterday. Too focused on discussing ECM swaps, I guess. I need to start writing myself notes. Edward
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Post by dclambertt on Jun 30, 2014 18:55:23 GMT -5
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Post by 6500rpm on Jun 30, 2014 19:40:59 GMT -5
I have to ask...is there a known electrical issue with these particular IAC's? I my experience, most IAC issues can be fixed by simply removing the carbon build up and lubing the IAC with PB Blaster. Just remove the IAC and use some carb cleaner, a tooth brush/rag and clean the air passage in the throttle body well to remove carbon that builds up on the seat where the pintle valve on the IAC seats. Do the same on the IAC pintle valve and shaft. I usually give the IAC a shot of PB Blaster and shake it out a few times after cleaning. Most commonly the pintle and the seat area get carbon build up over time and it doesn't allow it to seat properly, or it build up on the shaft that drives the pintle valve causing it to bind. It's a 30 min fix unless you have issues with the windings inside the IAC.
Did a quick youtube search, here's one of several vids on IAC cleaning.
www.youtube.com/watch?v=URFipH31-Eg
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Post by ES_97Sport on Jul 1, 2014 14:14:49 GMT -5
I have to ask...is there a known electrical issue with these particular IAC's? I my experience, most IAC issues can be fixed by simply removing the carbon build up and lubing the IAC with PB Blaster. .... Back in the olden days, yes, there was. I don't remember the details any more, but that was the reason for the redesign of the IAC - what I was talking about above. Now? Using the new IAC? No. If you're interested in the details, start surfing the pre-'97 DSM Eclipse, GT, etc. boards. Other than how the wiring works - which I pointed out - and the exact details of HOW the damage to the ECM occurs, no of its terribly relevant now, I expect. Unless the Chinese crap is still using the old design - which I actually expect they are. Otherwise, the vast majority of the IAC problems fall into two categories. 'Wear-and-tear' and 'maintenance error'. They do wear out as I'm sure you know. I've had to replace two on my big Sport and still need to replace the original on my little '97 running the factory IAC. After a couple hundred K they start getting awful sloppy. The other is from randomly spraying carb cleaner, brake cleaner, WD40, PB, etc. in the throttle body and the ports while the IAC is still mounted. There isn't a seal that keeps that stuff from getting to the electrical windings of the IAC. Chemical cleaners will dissolve the insulation on the windings causing a short. Obviously that's the end of the IAC, but that then can fry the ECM/PCM. Yes, its possible to clean the IAC itself like you said, and sometimes that works as long as that's the actual problem, but in my experience the problem is the IAC is just plain worn out. I remember when I replaced my first IAC on my big Sport @ about 250K. The pintle wobbled and rattled around so loosely I couldn't figure out how it worked at all, let alone as well as it did. Anyway, for whatever design reason, the 3.0L and 3.5L don't seem to get a lot of crud build up back at the throttle body. Edward
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Post by ES_97Sport on Jul 1, 2014 14:22:06 GMT -5
That LOOKS like an original OEM part but I don't know how to tell for sure. Given the amount of counterfeit product coming from China these days .... Not to mention I'd be a little concerned with handing my CC over to some random web site I've never heard of before. Edward
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Post by dclambertt on Jul 1, 2014 16:19:13 GMT -5
Yeah, did you read any of the forum posts? Overwhelmingly 1 of 5 stars from buyers.
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Post by colted on Apr 12, 2015 18:05:33 GMT -5
At the risk of ridicule, I bought an aftermarket IAC on ebay for $49 with a "lifetime" guarantee. At that price what could I lose when OEM controllers were running in the $250-$300 range. Truck is running like new. I'll see how long it lasts, but wow what a difference. It had been dying at every stop in stop-and-go traffic on I5. Can you share me the ebay seller where you got your IAC?
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