Mechanics

ELECTRICAL

Jeep CJ7

83 jeep cj7 165,000 mi 4.2 engine I have no spark i've changed the folowing, ignition coil, rotor, dist cap, magnetic p/u, and computer is there any inline fuses or something else i'm missing?
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Copeman
November 16, 2007.



Hello !
Did you tried to " run" a positive wire from the battery to the ignition coil?
That way you will know for sure that the problem its not the ignition switch or the control wiring.

Let us know!

If the problem persist, tonight, as soon as I get home i`ll send you an a wiring schematic on your ignition system.

Good Luck!

Tiny
Fisherman
Nov 16, 2007.
Hello Copeman.

Disconnect the positive wire from the coil and connect there the one from the batt. (+)

leave the (-) side on the coil. Thats the one it came from the pick-up coil and igniter

that way you will know if the ignition switch its good or not (process of elimination)

good luck and let me know any other question.

I`ll post this on your thread.

(copy and paste from my PM)

Tiny
Fisherman
Nov 16, 2007.
Hello Copeman!!

Following your question here its the schematic of your Jeep:


http://www.2carpros.com/forum/automotive_pictures/576_Jeep_1.jpg



Leave the Capacitor and the (-) (from the ignition module) connected.... just disconnect the red wire and connect an straight wire to the positive terminal of your battery..
that way we will find if the solenoid and your ignition switch are good or not..

let us know on this thread..

Good Luck!!

Tiny
Fisherman
Nov 16, 2007.
Fisherman,
I don't think the problem is an ignition switch because it turns over strong, and I have spark at the top of the coil but not at the plugs.
Thanks

Tiny
Copeman
Nov 16, 2007.
OK. I though you have no spark at all, then the spark out of the coil. Its constant I mean " click click clik" when cranking?
If you connect a tester light on negative of the coil and the other end on the positive (of the coil) did you get " pulses" (on-off-on-off?

Let me know.

Tiny
Fisherman
Nov 16, 2007.
OK. I though you have no spark at all, then the spark out of the coil. Its constant I mean " click click clik" when cranking?
If you connect a tester light on negative of the coil and the other end on the positive (of the coil) did you get " pulses" (on-off-on-off?

Let me know.[/Quote]

Fisherman,

I tested the coil and yes I get pulses on and off
and then I tested for spark again @ the plug and nothing. What do you suggest next?

Tiny
Copeman
Nov 19, 2007.
Fisherman,

I tested the coil and yes I get pulses on and off
and then I tested for spark again @ the plug and nothing. What do you suggest next?[/Quote]

Hello !

Which plug you`re testing for spark?
An spark plug or the wire that " feeds" the distributor cap?

Well.

Check for spark directly on the coil output.

(the wire that goes to the distributor cap)

sometimes the coil is defective (even new) I saw some cases like that.

If the spark its good there the problem should be the distributor cap or rotor (the spark its missing inside due to a " moved" rotor in respect the cap post when the coil its sending the spark)

the cap could be out of place.

But the problem its there. Right there!

Good luck and let me know!

Tiny
Fisherman
Nov 19, 2007.
Hello !

Which plug you`re testing for spark?
An spark plug or the wire that " feeds" the distributor cap?

Well.

Check for spark directly on the coil output.

(the wire that goes to the distributor cap)

sometimes the coil is defective (even new) I saw some cases like that.

If the spark its good there the problem should be the distributor cap or rotor (the spark its missing inside due to a " moved" rotor in respect the cap post when the coil its sending the spark)

the cap could be out of place.

But the problem its there. Right there!

Good luck and let me know![/Quote

fisherman,

ok I checked the spark @ the coil lead it's good,
i checked the cap and rotor they also look good
but no spark on the wire at the plug.

Tiny
Copeman
Nov 19, 2007.
Quote} fisherman,

ok I checked the spark @ the coil lead it's good,
i checked the cap and rotor they also look good
but no spark on the wire at the plug. Quote}

OK

how are you checking the spark?
With a screwdriver or with a spark plug?

Its the wire good?

Did you check all of the wires?

Its the cap and rotor right in place?

Did you move the distributor out of time?

Let me know on that!

Tiny
Fisherman
Nov 19, 2007.
Fisherman,

i checked the spark with a screwdriver and with a test light, the wires are all new and I put the rotor and the dist. Cap on the same way it came off.

Tiny
Copeman
Nov 19, 2007.
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