'93 Dakota won't run below 1200RPM? UPDATE!!
#2825341
09/26/20 02:57 PM
09/26/20 02:57 PM
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Joined: Jan 2003
Posts: 16,813 Between Houston & Galveston TX
SattyNoCar
OP
Smarter than no class Flappergass by a mile
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OP
Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,813
Between Houston & Galveston TX
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Pulled my Dakota out of storage today and left it idling while I locked the place up again. Was idling fine when suddenly there was a VERY loud 'POP' and the idle dropped, shot way up then dropped again and stalled. Checked for obvious signs, didn't see anything out of place. Truck starts right back up as long as your foot is on the gas. Take your foot off or just let the RPMS drop a little, and it cuts off. Not spit/sputter die, just OFF. Didn't have tools with me at that moment, so I'm going back tomorrow to take a closer look. Any suggestions on what to check? On a side note, truck sees limited use lately, and it hadn't been run in about a week. At that time, there were no issues. Thanks.
John
The dream is dead, long live the dream.......😥
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Re: '93 Dakota suddenly won't run below 1200RPM?
[Re: SattyNoCar]
#2825363
09/26/20 04:40 PM
09/26/20 04:40 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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Truck starts right back up as long as your foot is on the gas. Take your foot off or just let the RPMS drop a little, and it cuts off. Not spit/sputter die, just OFF. I don't know anything about the first part of your post, but this part sounds a bit like IAC motor troubles.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: '93 Dakota suddenly won't run below 1200RPM?
[Re: Magnumguy]
#2825452
09/26/20 09:35 PM
09/26/20 09:35 PM
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Joined: Jan 2003
Posts: 16,813 Between Houston & Galveston TX
SattyNoCar
OP
Smarter than no class Flappergass by a mile
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OP
Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,813
Between Houston & Galveston TX
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I'm thinking IAC as well. What threw me was the POP it made. Backfire? I don't know where it came from as my back was turned when it happened.. I wasn't able to get back to the truck tonite, but I have a spare IAC that I can try tomorrow. I checked all the vacuum lines and capped ports and didn't find anything. I did the plenum upgrade shortly after I bought the truck, hopefully that didn't go bad again. I'll report my findings tomorrow.
John
The dream is dead, long live the dream.......😥
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Re: '93 Dakota suddenly won't run below 1200RPM?
[Re: A727Tflite]
#2825508
09/27/20 12:35 AM
09/27/20 12:35 AM
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Joined: Aug 2005
Posts: 5,999 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 5,999
Salem
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x4 for idle air control.
You can take it out and clean it with oven cleaner first. That always works for Me along with O2 sensors. I just did one and took the whole throttle body off, brushed it good with gas and compressed air to blast the crud out.
Runs like new.
Mo' Farts
Moderated by "tbagger".
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Re: '93 Dakota suddenly won't run below 1200RPM?
[Re: Grizzly]
#2825776
09/27/20 07:07 PM
09/27/20 07:07 PM
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Joined: Jan 2003
Posts: 16,813 Between Houston & Galveston TX
SattyNoCar
OP
Smarter than no class Flappergass by a mile
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OP
Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,813
Between Houston & Galveston TX
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A majority of the problem was the IAC...... However, I found two other issues? 1) The throttle body baseplate gasket was in two pieces. And based on witness marks on the manifold, it had been that way for some time. I replaced that gasket when I did the intake manifold, throttle body hasn't been off since then until today. Source of a vacuum leak? 2) the port that the MAP (?) plugs into was almost completely blocked. No amount of spray or compressed air was clearing it, I had to get after it with a metal pick. Carbon? Dirt? I could have missed this the first go around. I didn't replace the IAC, I just gave it a good cleaning and polish. Turned out my extra IAC was different, so I couldn't use it. Truck idles MUCH smoother now and smells different now too, leaner? If that makes sense. Gave it a 5 mile run, she does pull harder when matted now (cup holder on dash slid open..... ) I spent so much time tinkering on it, I never did get to work on the roof. Oh well. I actually enjoyed doing this today. The weather was good, no interruptions, just got lost in it for a few hours. It felt good. Thanks everyone!
John
The dream is dead, long live the dream.......😥
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Re: '93 Dakota suddenly won't run below 1200RPM?
[Re: SattyNoCar]
#2825793
09/27/20 07:40 PM
09/27/20 07:40 PM
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Joined: Jan 2003
Posts: 15,315 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,315
Omaha Ne
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Re: '93 Dakota suddenly won't run below NOT fixed
[Re: TJP]
#2839909
10/31/20 08:47 PM
10/31/20 08:47 PM
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Joined: Jan 2003
Posts: 16,813 Between Houston & Galveston TX
SattyNoCar
OP
Smarter than no class Flappergass by a mile
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OP
Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,813
Between Houston & Galveston TX
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All was great for a few days, then the problem came back, but with a twist? Between work and nursing a bum ankle, haven't really looked into again until this past week. I went ahead and changed the IAC and the fuel filter. Truck runs buttery smooth now! BUT...as the truck warms up, the idle gets lower and lower until it reaches full temp where it won't idle at all. Doesn't matter if you're just sitting idling or driving, take your foot off the gas and it just dies. I switched the IAC because it wouldn't idle cold or hot, now with the new one, it idles only when cold. It doesn't run rough at any point, it stays smooth at all times, even just before stalling. Bad IAC? Any vehicle I've owned with a vacuum leak, the idle went higher, not lower, but I checked everything visible that I could and didn't find anything. Suggestions? I REALLY need this truck right now, but its basically undrivable.
John
The dream is dead, long live the dream.......😥
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Re: '93 Dakota suddenly won't run below NOT fixed
[Re: sam64]
#2839936
10/31/20 09:41 PM
10/31/20 09:41 PM
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Joined: Jan 2003
Posts: 16,813 Between Houston & Galveston TX
SattyNoCar
OP
Smarter than no class Flappergass by a mile
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OP
Smarter than no class Flappergass by a mile
Joined: Jan 2003
Posts: 16,813
Between Houston & Galveston TX
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If you know someone with a snap on or simular scanner have all the settings reset to default. Is that even possible with OBD1? Along those lines, I did disconnect the battery while I made the change, thinking it would 'learn' the new IAC?
John
The dream is dead, long live the dream.......😥
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Re: '93 Dakota suddenly won't run below NOT fixed
[Re: TJP]
#2840170
11/01/20 01:47 PM
11/01/20 01:47 PM
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Joined: Sep 2003
Posts: 19,355 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,355
north of coder
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Silly question? Any chance the temp sensor is bad and possibly going open or giving the wrong value to the ECM. Just a thought i have seen temperature sensors act like that when they have a "coating" of sorts on the bulb that sees the coolant. when shined up to "new" brass, sometimes they come back to life. would be an easy thing to try.
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