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mhall02
Dodge Dakota
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4/05/2004
10:37:41
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 Subject: automatic idle speed motor?
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Does anybody know anything about this part? After reading some old posts about idle problems with the pre-mag (i.e. 1991 TBI 3.9 V-6) this may be my problem. After my truck is warmed up and I go to start it, it stumbles at idle for a second or two, then picks right up like there is no problem, and when going down the road it runs great. Within the last year the plug wires, plugs, cap and rotor, and fuel and air filters have all been changed. Like I said above this is a 1991 V-6, non-Mag, so I don't think there is an IAC? Right now this is just a little annoying, since the truck runs good after it gets going, its just the first few seconds after starting it stumbles around and dies once in a while. Any thoughts are appreciated.
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Bob Lincoln
Dodge Dakota
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4/05/2004
13:34:07
| RE: automatic idle speed motor?
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I'll let you know. Same problem here with my Magnum '92. Hot start, just drops smoothly to 400 RPM and dies sometimes, have to hold gas to 1300 or so to keep it going, for about 10 seconds, then fine. Since I'm new to this vehicle, haven't had a chance to diagnose it. No fault codes, though.
The TPS is a variable resistor (potentiometer) across the throttle plate, which gives readings of about 0.4 volts at idle to about 4 volts at wide-open throttle. Tells the computer how to adjust the mixture according to throttle position. Measure resistance with analog ohmmeter while opening and closing throttle, look for steady sweep of readings.
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tc
Dodge Dakota
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4/06/2004
00:56:05
| RE: automatic idle speed motor?
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as long as you have fuel injection, you have an IAC. somewhere near the throttle plate. the TPS (throttle position sensor) is usually directly inline with the throttle plate pivot - and the IAC is not too far away. it controls how much air gets past the throttle plate at idle. It looks alot like a miniature EGR valve. sometimes cleaning the IAC pintle, the backside of the throttle plate will clear up idle issues.
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91Dakota
Dodge Dakota
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4/06/2004
01:53:07
|  RE: automatic idle speed motor?
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I'm having the same problem after 180000 miles!! After the truck warms up the stumble is gone. Very annoying in cold weather. This problem just started to appear a few weeks ago. I'm going to clean the IAC pintle(?). Yes, I've seen it. It's a black plastic minuture EGR valve looking thingy. Wonder how much a new one costs?
If that does not fix the problem then I'm going to look at changing the MAP and throttle position sensors.
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GB2000
GenIII
4/06/2004
02:49:20
| RE: automatic idle speed motor?
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I think I read that a new IAC cost around 70 bucks from the dealer... not positive though. Easiest way to find out is call the dealer and ask em.
Josh
Red 98 RC V6 2wd Single in/dual out exhaust (soon to be switched to a flowmaster 40 single in/dual out), s-bolt "mod", Edelbrock 10" round air cleaner w/ K&N air filter, removed rubber flap...and more to come
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badassdak
Dodge Dakota
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4/06/2004
10:49:59
| RE: automatic idle speed motor?
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Hey I have had the same problem with my truck lately! My truck did the whole stalling/sputtering at start crap... and would die once in a while. Then one day it died while driving and wouldnt start. I changed the cap,rotor,plugs,wires, belt, and IAC motor. It started right up. You can get the IAC at autozone for 42 bucks. Not too bad. VERY EASY to change. I am still having a problem though. Look at my previous posts.... I have on on the main page called "Stalling". Tell me if that is the same problem as you!
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mhall02
Dodge Dakota
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4/06/2004
11:48:35
| stalling
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No, I read your post and my situation is different. My engine only hesitates when starting, it will start and the idle is really low and stumbles for the first few seconds, then the idle picks up and it runs great throughout the rest of my driving time. Also, this is a pre-Mag V-6 with throttle body injection, not muti-port fuel injection, I don't think is has everything yours has. It isn't a big deal right now, but I think based on what I read in my Haynes manual and as suggested by others, my TPS may not be moving the throttle to the proper position for startup, maybe. I'll keep investigating and see if the problem gets worse. Thanks for all of the input.
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91Dakota
Dodge Dakota
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4/06/2004
22:01:38
| RE: automatic idle speed motor?
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It's something simple. I did a tune up last year so I know it's something I have not changed yet. I'll be looking at this week.
Hey does your Maint Required light come on? Since a new IAC is $40 from the parts store I guess I'll go a head and change it on Thursday.
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GB2000
GenIII
4/06/2004
23:03:39
| RE: automatic idle speed motor?
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Hey 91Dakota...try cleaning it before blowing 40 bucks on a new one. Spray it with carb cleaner and be careful about twisting, pushing or pulling on the plunger thingy. If it's really carboned up, it'll mess up your idle.
Josh
Red 98 RC V6 2wd Single in/dual out exhaust (soon to be switched to a flowmaster 40 single in/dual out), s-bolt "mod", Edelbrock 10" round air cleaner w/ K&N air filter, removed rubber flap...and more to come
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mhall02
Dodge Dakota
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4/06/2004
23:06:13
| RE: automatic idle speed motor?
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No check engine light, no new codes showing up. Let me know if what you replaced does the trick and what you paid for the part. Looking at all of the above mentioned parts, they look easy enough to change, but not cheap as plugs, cap, rotor, or filters.
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orange
Dodge Dakota
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4/08/2004
02:48:54
| RE: automatic idle speed motor?
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my truck does the same thing o well its running great now
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91Dakota
Dodge Dakota
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4/11/2004
06:23:31
|  RE: automatic idle speed motor?
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Forget the AIC. The TBI V-6 and V-8 up to 91 do not have it. They have a ISC (idle speed control actuator). 92-later models and OHC have the AIC. All the problems seem to point to an emissions item, vacuum leak or ISC (timing problem). I've checked the hoses. Found one small broken leaking connection. Fix it. Next is to check the timing. First checking the timing on the engine then adjusting the ISC. Next I might replace the EGR lines and valve. For now, I think the problem is in the timing and ISC.
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91Dakota
Dodge Dakota
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4/19/2004
20:05:12
| RE: automatic idle speed motor?
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Update. Looks like the leaking vacuum hose to the MAP sensor was the problem. I think I'm still going to readjust the ISC. Easy to do anyway.
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