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Mikej43
Dodge Dakota
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11/28/2005
11:04:06

Subject: Stalls after warm up
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1999 Dodge Dakota 3.9L V6. Manual Trans,
91,783miles.

SYMPTOM: Truck initally starts and runs fine. [15 minutes] However once it warms up to normal operating temp as indicated by temp gage. It won't idle, it sputters, knocks, pings, and a few backfires.
I can bump the idle above 2000 RPM with the pedal and the truck will run/move OK. But near idle and about 1500RPM it just sputters.
Engine check light does come on and stay on. No error code is present when read with OBDII test set.

Work atempted so far: Have replaced; wires, plugs, Distb Cap and rotor. Air cleaner is new. Replaced 1st up stream 02 Sensor. [not the second, Down stream one] Have examined and cleaned the IAC, Idle air control sensor. It was slightly dirty and did clean OK. Tested the resistance of the IAC with OHM meter. 59.3 Ohms on both sets of connectors. Pins 1/4 and 2/3.

Gas in tank is believed to be good now. Have run a new tank full of gas with Injector cleaner so far.

Thanks for any help,
mj



?
Dodge Dakota
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11/29/2005
08:32:58

RE: Stalls after warm up
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Message:
1 - check Throttle Pos. Sensor
2 - Intake Air Temp sensor



mikeyj43
Dodge Dakota
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12/03/2005
10:24:03

RE: Stalls after warm up AND now p1391 Error
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UPDATE....Symptom is still the same. Finally the computer has lit the check engine light. The code Stored is P1391. That Decodes to the $55 Cam-Posion Sensor and/or the $95 Crank Position Sensor. My udated question is....My question for the group is. With the symptom of idle stumble only after warm up. Which of these two sensors is most probable and why.
Thanks for everyones opinions.

mj



GB2000
GenIII
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12/03/2005
10:33:20

RE: Stalls after warm up
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Not sure which it is...I'd guess Crankshaft position sensor. And shop around. Autozone's site only has one listed for $98 but I bought one there for under $50 (when I was doing the CPS mod) about a year or so ago.





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Dan M
Dodge Dakota
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12/03/2005
12:01:21

RE: Stalls after warm up
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crankshaft testing

tab up, right 2 pins. Test with ohmmeter. should be open/infinite resistance. If not, replace.

If that tests ok, replace camshaft. It's cheaper and is part of the distributor assembly.

- Dan M



mikej43
Dodge Dakota
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12/04/2005
18:45:58

RE: Stalls after warm up
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Update: Since the weather has turned colder, temps rangeing from the teens to the mid 30's. The same symptom has gotten so much worse. Bucks and stalls so badly now, really can only drive in second gear at high RPM's after the engine warms up.

But Yeha, Whoo ha...the truck is working now. Had the p1391 error, and went for the cheaper of the two parts. The cam sensor at $55. Think that was it ? Nah, Murphy's Law.

It was the $97 Crank Sensor. Replaced it and twelve plastic rivets that hold the wheel well splash shield in place. Truck is running like a champ all day today. When you think about it, the colder weather migh have been a clue. As the CAM sensor would be unaffected by cold temps, as it only senses the passing of the dist. plate through the sensor. But the inductive sensing Crank Sensor, its impedence would be changed by colder temps. Could of saved $70 bucks.

Oh Well, Anyone need a slightly used but good Cam sensor for their distribuator.



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