ranman
Ultra Senior Member
Posts: 10986
Loc: The cold wet and windy O...
Reg: 03-10-01
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02-01-09 02:34 AM - Post#1620190
Just how important are the factory specs on resistance in a coil. It's from an '89 Dakota pickup with a 3.9L V-6 Coil is the factory one, probably original. It's the regular kind of coil attached to the firewall, not a coil pack like later years.
Chiltons manual says:
Primary winding should be between .95 to 1.20 ohms
This coil I have tests out at 1.9 to 2.0
Secondary winding should be between 11,300 and 15,300 ohms
This coil I have tests out at 10,600 to 11,000
(I brought the coil inside to warm it up and that gave me the two different readings I showed as it cooled off from about 100 degrees down to room temp)
There is no spark at all to the plug wires and no detectable spark from the coil tower wire then we crank the engine and hold the coil lead near a good ground.
I got a call to see if I could help get this engine running again. It ran OK a couple weeks ago, but just wouldn't start one day.
The spark plugs wires cap and rotor have all replaced. and we can hear the fuel pump in the tank pump up to pressure when the ignition is turned on. Fuel filter has been replaced also.
This pickup has TBI and electronic ignition.
My big question is the coil. After reading the ohm numbers I showed up above, do you think this coil could be the culprit?
If not, what else would cause no spark?
When the key is on, there is voltage to the coil.
I don't want to just randomly start replacing parts one at a time till we get this figured out.
It's a Dodge, but I trust you guys more than anyone.
Thanks in advance for any input on why this engine won't start anymore.
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If plants ruled the world, would they regulate oxygen?
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Edited by ranman on 02-01-09 02:47 AM. Reason for edit: No reason given.
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