2.9L Ignition problems
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Senior User
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2.9L Ignition problems
87 2.9L ranger wont run unless you arc the coil wire with coil. When the coil wire is connected to coil, truck will not start or run. If you hold the coil wire close to coil, the truck will start and run, as soon as you push the wire on the coil the truck dies.
The entire ignition system has been replaced. (coil, distributer, cap and rotor, plug and coil wires, spark plugs, and Ignition control module, and computer!)
Anyone know what could be the problem???
The entire ignition system has been replaced. (coil, distributer, cap and rotor, plug and coil wires, spark plugs, and Ignition control module, and computer!)
Anyone know what could be the problem???
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From: ventura, CA
Originally Posted by matt0963
The entire ignition system has been replaced. (coil, distributer, cap and rotor, plug and coil wires, spark plugs, and Ignition control module, and computer!)
Cargo Master
Joined: May 2001
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When you are causing the spark to jump that gap you are increasing the voltage of the spark making it hotter. There is something that has to much resistance in it and the only way to over come it is to cause a voltage increase. And it is on the high voltage side of the system. I would really check everthing from the coil through the dizzy. This sounds like a bad coil wire or rotor . Plugs with way to much gap could cause this.
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From: SW Va
Sounds like somethng is loading the coils secendary winding down, such that with the coil wire CONNECTED, it just can't build enough voltage to overcome the low impeadnce load & fire the pugs.
If you hold the coil wire off a good ground about 1/8 to 1/4 inch, is the spark blue in color & snaps smartly, or is it yellow & sounds kinda wimpy with not much snap???
Did you use Motorcraft replacement parts, or the least expensive parts you could find????
Is the battery up to full charge & is it's & the alternators output ok, under load????
If you hold the coil wire off a good ground about 1/8 to 1/4 inch, is the spark blue in color & snaps smartly, or is it yellow & sounds kinda wimpy with not much snap???
Did you use Motorcraft replacement parts, or the least expensive parts you could find????
Is the battery up to full charge & is it's & the alternators output ok, under load????
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humm, Ill have to check the alternator and battery, they seem to be fine because the truck turns over very easy. But Ill double check. The spark is blue with a snap.It does make sense about the arc making the voltage hotter. Ill have to check to see where the resistance is comming from.
no the parts wernt motocraft, but they were new parts from the parts store.
Thanks so much for the suggestions. Anything else anyone can think of just let me know, Ill try just about anything at this point.
no the parts wernt motocraft, but they were new parts from the parts store.
Thanks so much for the suggestions. Anything else anyone can think of just let me know, Ill try just about anything at this point.
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From: SW Va
OK, if you have a good blue hot "snapping" spark, then the alternator, battery, coil & coil wire are likely ok.
I'd begin looking carefully at the rotor.
If it's breaking down internally to the distributor post, it'll act like a short & load the coils secondary voltage down.
I have a feeling that'll be your problem!!!!
If it isn't, inspect the distributor carefully inside & out, for cracks, carbon tracks & bubbles.
If that looks ok, try replacing each new wire, with one of the old ones & see if you can isolate something that way.
Let us know what you find.
I'd begin looking carefully at the rotor.
If it's breaking down internally to the distributor post, it'll act like a short & load the coils secondary voltage down.
I have a feeling that'll be your problem!!!!
If it isn't, inspect the distributor carefully inside & out, for cracks, carbon tracks & bubbles.
If that looks ok, try replacing each new wire, with one of the old ones & see if you can isolate something that way.
Let us know what you find.
Last edited by pawpaw; Oct 24, 2005 at 07:15 PM. Reason: correct wording
