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cody
Dodge Dakota
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4/09/2010
21:34:17
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 Subject: need help here
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my 93 3.9 v6 has about 235k miles on it, its been sitting for over a year, had a cloged cat, i cut that off and put a straight pipe on, changed plugs and oil/filter and air filter, new dist cap, new head gasket, heads machined, needs a new water pump, have a pump sitting around that i havent got around to putting in it yet, and the truck wont idle, it will run if i give it gas, it will idle a little here and there, i get a "no change in map form start to run" code, changed the map sensor, checked voltage to sensor (good) cleaned the trottle body with carb cleaner, i cant figure out what else to do. anybody have any ideas
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sprocket1200
Dodge Dakota
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4/10/2010
13:58:09
|  RE: need help here
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ignition coil?
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pssst
Dodge Dakota
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4/10/2010
17:36:30
| RE: need help here
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cody what was the code number you came up with when
you checked?
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Cody
Dodge Dakota
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4/10/2010
17:39:52
| RE: need help here
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12,13 and 55. Reset the comp a few times too and still the
same
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pssst
Dodge Dakota
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4/11/2010
00:27:46
| RE: need help here
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Me again
(12,55 are nothing you will always get them)
Code 13* MAP sensor or vacuum line may not be
working
Checked the vac line to it?
Was the terminals and port clean when you changed
the map?
Also check the wires to it.
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Steven
Dodge Dakota
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4/11/2010
01:34:30
| RE: need help here
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I have the same year and engine. A year ago on mine it wouldn't idle either unless i gave it gas to. I had the check engine light on and a buddy of mine had a computer to hook it up to. I don't remember what the codes were. Also we noticed that the water temp was at 115 when the engine was nice and hot. I replaced the egr vaulve and also the temp sending unit to the computer and it fixed it right up. Since your truck is old and has a lot of miles i'd try these too because mines only had 140,000 miles at the time. Also i cleaned the carb really good to and that fixed the problem for me. I don't know if this relates to your problem but it sounds similar to mine. I hope this helps
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Cody
Dodge Dakota
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4/11/2010
08:56:43
| RE: need help here
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Message:
When i cleaned it there was some junk in the vacuum line to
the sensor but it wasent clogged up. I also cleaned the plug
that goes to it. But that stuff didnt help alot when i did it.
Yesterday evening i changed the gasket on the throttle body
and i found a vac line in the back of the motor that wasnt
hooked up. I also cleaned the IAC that seemed to help.
Before i couldnt drop below 1000 rpms, now i can get it a bit
lower. Also i started getting code 14 along with the others.
When i checked the voltage i got around 7v.
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daddio
Dodge Dakota
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4/11/2010
10:32:19
| RE: need help here
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If you've checked for vacuum leaks and cleaned the connections I'd change the MAP sensro. Code 14 indicates a failure of the MAP snesor electronics.
Where did you read the 7 volts from? The MAP sensor output should be from .02 to 4.94 vdc. If yoou're getting 7vdc output it's got to be the MAP.It's probably shorted out.
Good info here: http://www.allpar.com/
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Cody
Dodge Dakota
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4/12/2010
10:26:11
| RE: need help here
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I just threw my leads in the part you plug into the sensor. I
havent got a chance to get in there and take a real good look
at it yet. What are solutions to the voltage being too high or
low?
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daddio
Dodge Dakota
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4/12/2010
12:28:47
| RE: need help here
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Cody, will it idle by itself? Or do you have to keep your foot on the gas?
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Cody
Dodge Dakota
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4/12/2010
13:02:16
| RE: need help here
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It will for maybe 10 sec. But i usually have to give it a little
gas
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daddio
Dodge Dakota
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4/12/2010
13:11:44
| RE: need help here
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Try unplugging the MAP and see if it will idle. If it does idle, go buy yourself a new MAP sensor. I don't have a manual for your year truck and the one I do have does not have a test procedure for the MAP anywhere in it.
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Cody
Dodge Dakota
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4/12/2010
13:44:57
| RE: need help here
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It runs pretty much the same without it. I already replaced the
sensor just to see if it made any difference. It didnt. Im
planning on checking my wiring schematics for it to do a
more thorough test so hopefully that will tell me something
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daddio
Dodge Dakota
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4/12/2010
14:09:38
| RE: need help here
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As I posted earlier, The MAP sensor output should be from .02 to 4.94 vdc. Your schematic should show you which is the constant input from the PCM and the output from the sensor to the PCM.
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cody
Dodge Dakota
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4/16/2010
00:06:53
| RE: need help here
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ok i took the IAC off and cleaned it really good and i tested the voltage with the key ON (not ideling) it gave me like 4.96 v. then with the sensor backprobed reading the voltage coming out it was the opposite of what the book said it should be, as you give the truck more gas the voltage is supposed to increase and idleing with the throttle closed is supposed to be low voltage ( i might have that backwards) but it was the opposite, i dont remember exactly what the readings were,
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Bob Lincoln
Dodge Dakota
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4/16/2010
08:15:49
| RE: need help here
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Message:
Which sensor are you probing? Or are you looking at the AIS motor?
TPS (Throttle Position Sensor) voltage increases with increased throttle. The span is roughly 0.7V at idle to 3.8V at wide-open throttle.
The MAP sensor voltage is proportional to vacuum. So as vacuum drops (during acceleration), voltage drops. The numbers that daddio gave you are the limits outside of which the ECM will flag a fault code, but in reality the sensor output is between about 4.5V and 0.8V.
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