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Coolant temp. sensor causing erratic idle?

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  #1  
Old 04-30-2009, 11:04 PM
Coadster Coadster is offline
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Default Coolant temp. sensor causing erratic idle?

As most of you may know, I've been having a few issue with my 95' kota. Heres the jist of it - It idles fine for about 3 or 4 minutes, then the rpm's start to drop, then it will go back up, then drop really low, then go back up and continues this cycle. If I rev it a bit, when it comes down it will go down almost to the point of stalling then go back to normal - and continue the surging process. Im thinking because its fine when its cold, and then all whacked when its warm, that it it probably this sensor. I checked and it threw a '22' code, which is 'coolant temp sensor out of range'. Im going to replace it tomorrow, reset the computer, and pray that it was the problem. Can anyone shine some light on this? Anybody else have this problem? If this doesnt fix it, I'll try replacing the IAC. But, hopefully I wont have to.
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Old 05-01-2009, 12:07 PM
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Originally Posted by Coadster View Post
As most of you may know, I've been having a few issue with my 95' kota. Heres the jist of it - It idles fine for about 3 or 4 minutes, then the rpm's start to drop, then it will go back up, then drop really low, then go back up and continues this cycle. If I rev it a bit, when it comes down it will go down almost to the point of stalling then go back to normal - and continue the surging process. Im thinking because its fine when its cold, and then all whacked when its warm, that it it probably this sensor. I checked and it threw a '22' code, which is 'coolant temp sensor out of range'. Im going to replace it tomorrow, reset the computer, and pray that it was the problem. Can anyone shine some light on this? Anybody else have this problem? If this doesnt fix it, I'll try replacing the IAC. But, hopefully I wont have to.
im pretty sure that the IAC and TPS are pretty cheap and easy to replace, so if i were you, i would replace all 3 of them. its sounding alot like the TPS to me, but ive been wrong too many times to say for sure lol.
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Old 05-01-2009, 10:17 PM
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Well, I replaced the sensor. And guess what? She runs like a top now, Idles flawlessley. It still confuses me how the cooling system affects the idling.
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Old 05-02-2009, 10:06 AM
kahanabob kahanabob is offline
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It's the computer dealing with a bad sensor.
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Old 05-04-2009, 01:14 AM
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My truck is doing the same thing, I replaced the TPS and its still doing it. Did you replace the IAC or something else?
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Old 05-04-2009, 10:58 AM
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My truck is doing the same thing, I replaced the TPS and its still doing it. Did you replace the IAC or something else?
he changed the coolant temp sensor
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Old 05-04-2009, 03:28 PM
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So the coolant temp sensor is different from the IAC?
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Old 05-04-2009, 10:03 PM
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IAC Intake Air Charge. It takes the incoming air temperature. There are 2 coolant sensors. 1 for the computer with 2 wires. 1 with 1 wire for the guage. The are located on both sides of the hemostat housing.
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Old 05-04-2009, 10:22 PM
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I was just reading this post and am very confused... What IAC are you talking about Crazy? The only thing I know of that is called IAC is the Idle Air Controller. There is an Intake Manifold Air Temperature sensor... is this the one you're talking about?

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Old 05-04-2009, 10:55 PM
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I guess I just wasn't paying attention. I was just thinking of sensors and just didn't think of the Idle air control. But the Intake manifold air temperature sensor is what I was talking about. There are several types of names for lots of these things. Here is autozone's page with it called Air charge temperature sensor. I just added the Intake because that is where is located. http://www.autozone.com/autozone/cat...entId=cat10014
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Old 05-04-2009, 11:00 PM
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10-4. Just making sure there wasn't a sensor on these trucks I'm not aware of!
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Old 05-04-2009, 11:14 PM
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There is a air booster controller sensor. Now if you disconnect this you will get 40mpg and 150 more HP. Its located in the dashboard. I'm removing the dash right now so I can get to it! It's a gas company conspiracy to hide this from the public! Government is on this too man!
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Old 05-04-2009, 11:17 PM
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Quote:
Originally Posted by Crazy4x4RT View Post
There is a air booster controller sensor. Now if you disconnect this you will get 40mpg and 150 more HP. Its located in the dashboard. I'm removing the dash right now so I can get to it! It's a gas company conspiracy to hide this from the public! Government is on this too man!
LMAO! Let me know how that works out for you Crazy! I'll get my 150 more HP with the 408
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Old 05-05-2009, 04:47 PM
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Does anybody know why after replacing the coolant temp sensor I now get an error code 14 which is MAP sensor voltage too low? I started a new thread about this but it hasnt gotten much attention... I'm starting to hate sensors!!! Should I just try replacing the dam thing? I dont want to go and buy one only to find I dont need it.
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Old 09-15-2012, 06:34 PM
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Check the connectors to the PCM. Mine was throwing codes for all these sensors. I discovered that I could rock the connectors to the PCm and get the engine to stall. I put pipe clamps around the PCM and a dowel across the connectors and this solved ALL my problems.
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Old 08-08-2014, 10:42 AM
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Quote:
Originally Posted by Crazy4x4RT View Post
I guess I just wasn't paying attention. I was just thinking of sensors and just didn't think of the Idle air control. But the Intake manifold air temperature sensor is what I was talking about. There are several types of names for lots of these things. Here is autozone's page with it called Air charge temperature sensor. I just added the Intake because that is where is located. http://www.autozone.com/autozone/cat...entId=cat10014
I purchased an Air charge temperature sensor from autozone and can't find where the old one is. I have the 89 Dakota SE 4x4 with the v-6 engine. Any suggestions to where it might be located?
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Old 11-23-2014, 11:34 PM
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New member here.

What is this resetting the computer the OP refers to?

My rarely driven '94 Dakota 2WD started to idle wildly and turned on the check engine lamp. Thanks to dodgeforum I was able to interpret the codes and learn that the 22 called out the coolant temp sensor. It was replaced and the truck runs better most of the time.

The check engine lamp comes on shortly after I take off. Again, the code is 22. Will resetting the computer clear the error code if the problem is resolved or is more troubleshooting called for?

What is the procedure to reset the computer?

Thanks.
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  #18  
Old 11-24-2014, 12:57 AM
RalphP RalphP is offline
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The simplest way to reset the computer is to a) disconnect the negative battery cable, b) turn the headlights on (no, they won't come on), c) go inside and have a cold one (I like Diet Coke with Splenda - pick your favorite cold libation!) and d) after at least 15 minutes (which is overkill!), turn the headlights off and reconnect the negative battery cable.

Or, wait for at least 20 IIRC start cycles on the truck to see if it clears the error.

RwP
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Old 11-24-2014, 01:01 PM
kahanabob kahanabob is offline
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i replaced the coolant sensor on my old 90, got it from auto zone, it was a gray market sensor and it caused exactly what you describe. did not know it was the issue until i took it to the dealer and they replaced it with dodge part................
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Old 11-24-2014, 01:01 PM
 
 
 
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1993, 2003, 318, 59, cold, coolant, dakota, dodge, engine, erratic, idle, location, rpms, sensor, temp

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