No power to my coil

Tiny
COLTY045
  • MEMBER
  • DODGE DAKOTA
The coil on my 99 dakota is getting no power and I can't figure out why all my relays and fuses same like they are good but still I can get any power to my coil to get my truck to fire
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Thursday, May 18th, 2006 AT 11:58 AM

43 Replies

Tiny
LOSONE
  • MEMBER
Explain no kind of power to the coil. 12v or no spark out of the coil? And how do you know, have you tested it with a meter?
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Thursday, May 18th, 2006 AT 5:17 PM
Tiny
COLTY045
  • MEMBER
A Dodge Dakota SRT 1997 96,000 miles with no power leading into the coil where I should have 12 volts I get 0.005 on my multimeter
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+6
Thursday, May 18th, 2006 AT 8:28 PM
Tiny
LOSONE
  • MEMBER
Power to your coil comes directly from your SBEC )single board engine controller). It could be an auto shutdown relay. Check the voltage on the dark blue wire of you alternator with the key on. Here is the location in the diagrams below. Let me know
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Friday, May 19th, 2006 AT 8:24 AM
Tiny
COLTY045
  • MEMBER
I dont have dark blue wire going to my alternator I have dark green and dark green with black both showed zero
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Friday, May 19th, 2006 AT 11:45 AM
Tiny
LOSONE
  • MEMBER
Sounds like the auto shut down relay isn't on. It is also turned on by the SBEC. Either it is bad or the SBEC. It is in the engine compartment and with a breather hose running to it. It also houses the voltage regulator and is a high failure item. Good luck
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Friday, May 19th, 2006 AT 5:40 PM
Tiny
COLTY045
  • MEMBER
Are you talking about the auto shutdown relay I wished I replaced it earlier because that was the problem running great once again!
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Friday, May 19th, 2006 AT 7:41 PM
Tiny
LOSONE
  • MEMBER
Nice work, we are here to help, please use 2CarPros anytime.
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Saturday, May 20th, 2006 AT 7:56 AM
Tiny
DADIRTYDAWG
  • MEMBER
  • 1997 DODGE DAKOTA
Engine Mechanical problem
1997 Dodge Dakota 6 cyl Four Wheel Drive Automatic

we have a 1997 dodge dakota, 318 that will not start. Just quit one day. We Have checked for fuel and spark. Get spark to the coil but not out to make spark. We took coil to automotive parts store was told it was ok. Put on new wires and cap, cps. Checked the voltage going into the coil, both tested with light and meter. Is it possible that the coil, although tested ok, is just weak and isn't producing enough spark to fire?
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
TWOSTEPPER
  • MEMBER
Take the coil wire loose from the cap, hold close to engine ground, engine cranking, can you see a spark jump? If so, and the cap is new, I suspect the rotor.

Negative side of coil, black/gray, should have a pulse with engine cranking.
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
DADIRTYDAWG
  • MEMBER
Thanks, apparently, we have a pulse in the coil wires. We have spark going from coil to distributor cap. We have no spark coming out of the distributor cap. We replaced both the cap and rotor. Now what should we check?
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
DEN-DEN
  • MEMBER
  • 1997 DODGE DAKOTA
  • V8
  • 4WD
  • AUTOMATIC
  • 199,000 MILES
1997 dodge dakota 5.2 lost spark driving home, no power to the coil. Anyone have a wire diagram?
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
You will only have voltage to the coil for one second after turning on the ignition switch. It will come back whenever the engine computer sees engine rotation, (cranking or running). If it does not, suspect the crankshaft position sensor or camshaft position sensor.

Special procedures are required to set the air gap of the crank sensor so don't just yank it out to look at it and stick it back in. If the Check Engine light is on there will be a diagnostic fault code that will tell which sensor has the problem. If there's no codes, you'll need a scanner that can display live sensor data to see which one is missing.

Caradiodoc
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
DEN-DEN
  • MEMBER
I dug deeper, found a manual on line with wire schematics, I have power to coil + while cranking, also from B+ to coil- side of connector have I pulses. Going to pick up an ign coil. The pickup coil is under the cap so getting one of those just in case. 15 miles to town and only want to run once today in the darn snow. Thanks for your help.
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
You have snow too? Sorry to hear that. Everyone I know in WI is trying to get out to get away from the crazy property taxes.

Don't waste your money on the cam sensor in the distributor. If you're getting 12 volts to the ignition coil, the automatic shutdown (ASD) relay is turning on. The computer turns it on when it gets pulses from those two sensors.

If you also have pulses driving the ignition coil, it does indeed sound like it's bad. Normally I'd say that's not terribly common but I just solved an intermittent problem with my '88 Grand Caravan that I was fighting for 11 months. Acted just like a bad accelerator pump in a carburetor but turned out to be the coil.

Caradiodoc
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
DEN-DEN
  • MEMBER
Funny you mention WI, I am here. Tony area, any way thanks to my GF and Car Quest. It was the $29.00 ign coil. Very seldom have I seen these fail but I guess as part of my complete tune-up at 195,000 miles I should have done that too.

I cant wait till the snow is gone and I can bring the Stealth back out!

Good day and Thanks
Den-Den
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
Never heard of Tony. I'm in Wausau, darn it! Driving in Chicago is much easier.

On hot days my 3.0L would totally cut out at anything over half throttle, and pick back up when I let off the gas. Acted like a fuel problem but they actually run worse when coasting when the pickup screen is plugged. Standing still it could be revved up just fine. Eventually it would sputter for a few minutes, then die, but could be restarted in a couple of minutes. Ran fine on cold days until about two months ago when it died completely. Finally I found no spark. ASD relay was turning on and scanner said it was calling for spark. Popped in a used coil from my other van and it's running great. Made a 570 mile round trip around the state and it's back up to almost 23 mpg. Yippee!

All I can figure is at higher rpm and load, it took a higher spark voltage and that's when the coil was breaking down. When it died and had to be trailered home, that was the first time in 22 years and 224,000 miles it didn't get me home on its own power.

Caradiodoc
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
DEN-DEN
  • MEMBER
Driving in Chicago easier then Wausau? At least Wausau doesn't have them darn Tolls. Try Ladysmith during hunting season weekend. Kidding, anyway my truck started hard a few months ago after a rain, so I replaced Plugs OE wires, cap, rotor and seemed to fix it till now.

Years ago I had a oscilloscope for cars, but when electronic ign and coil packs etc came out I got rid of it. Didn't need it to watch the old points system anymore. Good old days.
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Thursday, January 7th, 2021 AT 3:14 PM (Merged)
Tiny
TIFFLOVESJEFF
  • MEMBER
  • 1995 DODGE DAKOTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
When cranking no voltage to coil or to the ignition pick-up stator.
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Thursday, January 7th, 2021 AT 3:15 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
Not sure what you mean by "pick-up stator". Do you mean the camshaft position sensor in the distributor? Voltage to the coil, fuel pump or pump relay, injectors, and alternator field will only be there during engine rotation, (cranking or running). The Engine Computer turns the automatic shutdown (ASD) relay on to power those circuits when it gets pulses from the cam and crank sensors.

If the 8 volt supply to the cam sensor is missing, unplug either the cam or crank sensor, then turn the ignition switch off and back on to see if the voltage comes back. If either sensor or its wiring is shorted to ground, the computer will shut down that power supply to protect itself. As I recall, when the short is removed, the supply will not come back until the ignition switch is cycled off and back on.

Caradiodoc
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Thursday, January 7th, 2021 AT 3:15 PM (Merged)
Tiny
CHRIS1973
  • MEMBER
  • 1994 DODGE DAKOTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 55,000 MILES
How do I replace the ignition coil on this truck
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Thursday, January 7th, 2021 AT 3:15 PM (Merged)

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