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Jason oram
Dodge Dakota
JOIN HERE
3/23/2004
18:20:26
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 Subject: Spark problems when warm
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I have a 1995 3.9L 2WD. The truck starts fine when cold but after a 1/2 hour the thing shuts down and has no spark. After about 2 hours it starts again and repeats the process. I have changed the Coil and checked the ground splice. Everyone points to fuel pump but I ask why the fuel pump would stop spark? Any ideas would help.
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Phil
Dodge Dakota
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3/25/2004
08:39:03
|  RE: Spark problems when warm
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ignition control module in distributor can't take the heat, NAPA use to carry them but no longer, Dodge dealer maybe the only bet left. I'm still messing with my 1988 3.9L. I've replaced the module three times so far, some will work for years some only last a few weeks. Obviously a quality control problem in the manufactoring of this unit. maybe why I can't find them at a parts store anymore. silicone grease around the unit may help disapate the heat when you replace it. If not carry a water pistol and cool the base of the distributor when if quits on you and see if it starts up. Then you will know for sure.
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J and J Auto
GenII
3/25/2004
19:46:24
| RE: Spark problems when warm
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95 has no modual in dist just a pickup to tell
the injectors when to pulse.
sounds like fuel pump to me replace it.
The only other thing in the system is a relay and
the crank sensor
Larry
J&J Auto
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Jason oram
Dodge Dakota
JOIN HERE
3/25/2004
20:50:18
|  RE: Spark problems when warm
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The Hanes manual says the isn't anything in the disttributor that could act that way. Why would the fuel pump stop the spark? I checked the codes and I got an "EGR system" problem once and now I only get a "Memory stanby power lost". Could the EGR Valve cause this? Also the truck seems to run longer every time. Now i'm stumped!!
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Jason oram
Dodge Dakota
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3/26/2004
11:10:39
| RE: Spark problems when warm
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I guess no one knows about this! The truck is driving me crazy.
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daddio
Dodge Dakota
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3/26/2004
11:55:25
| RE: Spark problems when warm
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if it has no spark when it does this, like larry said try the crank sensor. the fuel pump wouldn't cause you to lose spark.
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Jason oram
Dodge Dakota
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3/30/2004
18:38:05
|  RE: Spark problems when warm
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Where is the crank sensor located. The book I have points me to the transmission belhousing??? Is this The case because I can't see it.
The truck is not running as long now since I reset the computer the last time. Only about 5 min. I cooled all sensors and modules one at a time to try and isolate the problem but no good. There is no spark right from the output of the Coil when the truck cuts off. The stupid truck runs fine then just cuts off the spark. Running out of things to try, any ideas????
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Seth
Dodge Dakota
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3/30/2004
21:28:20
| RE: Spark problems when warm
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Check the crank sensor, located on the back of the block. If your facing the engine it will be the left rear of the left head (it pokes out of the block), you should be able to feel it, im not sure on the 95 but thats where its at on mine, and if its a magnum im pretty certain its in the same location. Also are you getting a check engine light, most of the time you'll get a check engine light if the crank sensor is bad, thats not always the case though. Next time it does it pull your coil harness off (the connector that has two wires that feeds into the coil) and using a test light probe the two terminals one at a time on the connector, just ground the test light to the body or somwhere. The have a friend spin the engine ever, one of the two terminals should make the test light flash as the engine is turned over, read your hanes manual it should tell. If it does not flash change the crank sensor, or, hate to say it computer. The computer on my 98 fried at 50,000 miles doing the same thing. check that though and let me know
Seth
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Jason oram
Dodge Dakota
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3/30/2004
23:46:22
| RE: Spark problems when warm
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Well give it a try. Thanks for the good info Seth
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Jason oram
Dodge Dakota
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4/04/2004
20:26:42
|  RE: Spark problems when warm
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The Crank shaft Sensor is on order and I well let you know the result.
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TOMZ
Dodge Dakota
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4/04/2004
23:39:22
| RE: Spark problems when warm
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Message:
Jason, try 2 things. 1st, you said the computer tru an EGR code. Did you change or clean out the egr tube to see if this was the problem? I have not had this problem but I have been told that if the EGR or PCV valves are not working properly you can get some stubling and backfiring.
2nd, have you checked your thermostate to see it is working correctly? Don't go by the guages in any of the new vehicles, THEY LIE!
I can't see how it would be the crak sensor, but it's definitely worth looking at. It's located just under your EGR tube on the back, passanger side of the vehicle-it's rite on the top of the bell houseing and hard to get at.
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Jason oram
Dodge Dakota
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4/05/2004
20:41:50
| RE: Spark problems when warm
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Message:
IT WORKS!!!
Thanks a million for the advise. The crank sensor was the problem. I tested the sensor while the truck was cold with a meter(resistance) and with all combination at the connector it was reacting as a capacitor would. After the truck warmed up 2 pins were showing short and 2 were showing open cct. Then I ordered the sensor. Running very smooth for now.
Again thanks to all that offered info.
Jason Oram
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Jason Oram
Dodge Dakota
JOIN HERE
10/07/2004
21:05:46
| RE: Spark problems when warm
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Message:
Darn truck broke down again. I haven't had a chance to work on it yet. Starting to dislike dodge now.
Jason
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Scott Nowicki
Dodge Dakota
JOIN HERE
10/10/2004
23:38:46
| RE: Spark problems when warm
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Message:
Jason --
My '98 3.9L Dakota is suffering the same problems that you originally described. For me it is happening on cold mornings, only after the engine reaches temperature. Then it will sputter and eventually stall unless I keep the the engine revving. The one day I pulled over and kept revving the engine, and after ~10 minutes all was fine. Later that afternoon on my way home from work, the air temperature has been much warmer, and I'm not having this problem. But when it sits for some time (overnight), and starts cold, it will do it again. A mechanic friend suggested the crank sensor, and that is in fact the code that is stored in the computer (well, it's actually listed as crank sensor or cam sensor). I'm going to try to pick up one and swap it out.
Just a couple of related questions for you: Did you have any trouble locating this sensor at auto parts stores? How much was it, roughly? Was the install difficult? And lastly, I noticed your post saying it was fixed was about 6 months before your recent post stating that you broke down again. Was this recent break down apparently the same problem? So then it ran okay for 6 months?
Looking forward to your comments, and thanks in advance.
Scott
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Jason Oram
Dodge Dakota
JOIN HERE
11/11/2004
13:02:50
| RE: Spark problems when warm
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Message:
Scott,
I had no problems finding the part in the parts store. It was about $90. It was hard to find at first until I was pointed in the right direction. It is located in the belhousing of the transmission near the firewall.( where the engine and transmission join) I had to remove small pipe going into the exhaust. After that it was easy. It did run fine before the second breakdown but now it seems it is back to the same problem. I will be working on it soon and let you know if it is the same problem.
Jason
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Steve Smith
Dodge Dakota
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11/12/2004
21:12:48
| RE: Spark problems when warm
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I have a 1998 3.9 giving me the same problem. I,ve replaced the crank sensor, pick-up coil in dist., and the ign. coil. I'm wandering if the computer is bad.
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Wayne
Dodge Dakota
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4/28/2005
17:02:24
| RE: starts and idle fine
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Message:
I just put a motor in a 1997 Dodge Dakota and she starts and idles fine but when I put her in gear she starts to shake and shiver and shuts off. When she don't cut off and try to drive her all she does is ping and rattle and kick back in her intake.I am stumped!!!! I would appreciate any ideas as to the problem. Thank you
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