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Sam
Dodge Dakota
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6/01/2008
10:07:11

Subject: Rough idle and stall
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I have a 94 dakota V8 4WD with 130K on it. And I was having a idle problem in the summer heat and after the engine heated up it would surge and just be terrible. Then when I shut it off, it wont restart for a long time.

So I checked the ignition wires (only three years old, the resistance seemed fine in them), changed the plugs and the cap and rotor. Didn't help at all. So I cleaned the EGR with some carb cleaner...nothing.

I was wondering if when the engine heats up and the spark plug wires get hot, could that effect their resistance? I'm running out of ideas here. Thanks guys,
Sam



jjj
Dodge Dakota
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6/01/2008
16:33:38

RE: Rough idle and stall
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you have to put a voltmeter on it u dumb b@stard

trust me i know my sh1t i work for dodge



Sam
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6/01/2008
22:44:08

RE: Rough idle and stall
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I did, all the wires were around 12 ohms...



jayb
Dodge Dakota
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6/02/2008
18:51:52

coil
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might have a bad coil. mine did something similar.



Sam
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6/02/2008
22:24:21

RE: Rough idle and stall
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How do you test the coil?



jjj
Dodge Dakota
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6/02/2008
23:17:27

RE: Rough idle and stall
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you have to put a voltmeter on it u dumb b@stard



jayb
Dodge Dakota
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6/03/2008
13:03:38

RE: Rough idle and stall
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if you get a Hayes or chiltons, it should tell you how to test it.



Sam
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6/03/2008
19:34:07

RE: Rough idle and stall
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Thank you for your help jayb.
And thank you for being a douchebag jjj.



Kowalski
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6/04/2008
08:15:33

RE: Rough idle and stall
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It's very unlikely that post really came from jjj; appears to have been posted by the site spoofer. Sometimes when a coil gets a break in the winding, it will cut out when it heats up and the ends seperate. You could check that with component cooler, in a spray can from Radio Shack. Also good for checking some other ignition compnents, it worked for me when my Harley was cutting out when hot. If it starts right up again after you cool it off, you've found the problem.

Lead, follow, or get out of the way

jjj
Dodge Dakota
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6/04/2008
09:02:01

RE: Rough idle and stall
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Sorry it isn't me, it is some child playing on mommy's computer. He tends to pretend to be several different people and adds nothing to this board.



jjj
Dodge Dakota
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6/04/2008
09:06:03

RE: Rough idle and stall
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Easiest way I have found to check plug wires - if not using a scope - is look at night for sparking between them and ground or spray each wire with water and see if the idle changes when the wire is wet.

Your symptoms could be alot of things :(



daddio
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6/04/2008
11:27:06

RE: Rough idle and stall
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it might also be the CPS(crank position sensor) or CMPS(camshaft position sensor) located under the distributor cap. i am sure there are procedures to check them but don't have them readily available. i'll see if i can find something in the FSM and post it if i find it. i'd much rather check them first than just replace them.



daddio
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6/04/2008
11:29:33

RE: Rough idle and stall
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another thought, when the engine gets "heated up" and stops, have you checked for loss of spark to the spark plugs? or is it loss of fuel?



SDave
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6/04/2008
15:13:20

RE: Rough idle and stall
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It sounds like a bad battery or like jayb said it could be the coil. If it turns out to be any of these two things, you can expect to replace the plugs again and run some fuel injector cleaner in the next tank to get it back up and running good.



daddio
Dodge Dakota
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6/04/2008
15:57:38

RE: Rough idle and stall
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this may help for checking the coil.

SPECIFICATIONS - IGNITION COIL RESISTANCE—EXCEPT 4.7L
COIL MANUFACTURER
PRIMARY RESISTANCE @
21-27°C (70-80°F)
SECONDARY RESISTANCE @ 21-27°C
(70-80°F)
Diamond 0.97 - 1.18 Min.Ohms 11,300 - 15,300 Max.Ohms
Toyodenso 0.95 - 1.20 Min.Ohms 11,300 - 13,300 Max.Ohms
SPECIFICATIONS - SPARK PLUG CABLE
RESISTANCE
MINIMUM MAXIMUM
250 Ohms Per Inch 1000 Ohms Per Inch
3000 Ohms Per Foot 12,000 Ohms Per Foot
SPECIFICATIONS - SPARK PLUGS
ENGINE PLUG TYPE ELECTRODE GAP
2.5L 4-CYL. RC12ECC 0.89 mm (.035 in.)
3.9L V-6 RC12LC4 1.01 mm (.040 in.)
4.7L V-8 RC12MCC4 1.01 mm (.040 in.)
5.2L V-8 RC12LC4 1.01 mm (.040 in.)
5.9L V-8 RC12LC4 1.01 mm (.040 in.)




Sam
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6/04/2008
19:41:08

RE: Rough idle and stall
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Thank you for all your help, I'm working 7 days this week...so that leaves no time to work on the truck. It's really terrible. But, at least I'll have money to fix it! I think the first thing I'll do is check the coil, the plugs give off a good spark when the engine is running after I first start it. After the engine stalls and while I restart it they don't seem to give off a spark while cranking.

They battery should be fine, it is a quality battery less than three years old. The engine doesn't throw any codes so i don't think it's a sensor, it should throw a code for that shouldn't it?

It's got plenty of pressure in the fuel rail after it stalls and I'm trying to start it. So the first thing I think I'll do is test the coil with that spray.

jjj sorry that some people just can't be happy without being jerks, you're not the douche, whoevers doing that is.



Kowalski
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6/05/2008
06:43:04

RE: Rough idle and stall
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Did you check for codes, or are you just going by the MIL ? There are hard and soft codes; some that set the light, and others that are just stored until retrieved.

Lead, follow, or get out of the way

Sam
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6/05/2008
18:35:29

RE: Rough idle and stall
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No I didn't try to pull any codes, but it didn't throw any. I'll see if I can pull any. Thanks,
Sam



Sam
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6/08/2008
12:35:10

RE: Rough idle and stall
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Hey, I pulled the coil and sure enough the resistance was way off, so I went and bought a new one and checked it against the old one, way better. So I installed it and took it for a drive, same thing happened. It's 92 degrees out today and muggy. Now I'm dumbfounded...



jjj
Dodge Dakota
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6/08/2008
14:21:03

RE: Rough idle and stall
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Try this
After is stalls and won't restart, disconnect the battery completely, reconnect it and try to start it. IF it doesn't start see if there are any codes, sometimes it will set one or two codes in those conditions.

That is a tough one to guess at :(



Sam
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6/09/2008
22:44:09

RE: Rough idle and stall
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Thank you, I will try that. Maybe this week.



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