No fire from coil pack for 1&4

[Partscaster62]

Just rebuilt a coil pack for cylinders 1&4 - new wires and caps. Followed directions from this site on new wires in old coil. Had some difficulties but now Ohms reading checks out ok - 1.7 on primary, 15k on secondary. But it will not create a spark. I have new plugs. Cylinders 2&3 are firing. Not sure what to do next. Is the coil just bad or is it something else? Thanks for any help.

[TopCatGr58]

Hey there,

You can test the fixed coil by just jumping a good +12V and Neg/ground wire to the primary, have plugs in both plug wires and against the head to provide a complete path from one plug along the engine to the other plug, put power to the primary for a second, and then pull it off, and check/watch for spark. IF spark, then the coil is repaired properly and good.

This will then indicate that the Pickup Coil or TCI is at fault, most common is the PU coil wires break that trigger the plug coil. You can swap the primary plug with the 2-3 coil and just see if you then get spark on the new coil on the 2-3 connectors. IF you get spark, and the previously good 2-3 coil that is now on the 1-4 trigger/connector is no longer sparking, then again this confirms problems with the PU coil wires.

T.C.

[donebysunday]

Could be the pickup coil or broken wire coming from it. Stretch the wires to the pickup coils to see if any get thinner in any area under slight stress ?

Just rebuilt a coil pack for cylinders 1&4 - new wires and caps. Followed directions from this site on new wires in old coil. Had some difficulties but now Ohms reading checks out ok - 1.7 on primary, 15k on secondary. But it will not create a spark. I have new plugs. Cylinders 2&3 are firing. Not sure what to do next. Is the coil just bad or is it something else? Thanks for any help.

[Radioguylogs]

Need the capacitor too

Hey there,

You can test the fixed coil by just jumping a good +12V and Neg/ground wire to the primary, have plugs in both plug wires and against the head to provide a complete path from one plug along the engine to the other plug, put power to the primary for a second, and then pull it off, and check/watch for spark. IF spark, then the coil is repaired properly and good.

T.C.

...and make sure the condenser is in the circuit- won't spark without it.

[Partscaster62]

No fire from coil pack 1&4

Thanks guys - gone for the weekend but will check it out on Monday.

[skids]

There is an easy check for High voltage coil:

Pull the plug connector caps. Key is off. Test Kohms from plug cap to the other. Should be 12 Kohms + kohms of each cap (something like 3kohms each) for a total of 18 kohms. This is usually called "checking the secondary coil" or at least checking continuity of #1 through the #4 high voltage circuit.

Chances are that if you have not been getting spark on #1 AND #4, you have a broken wire in the primary (pickup) coil.

If you have spark on # 1 or #4, there is an issue with one of the caps, one of the plug wires, or a bad connection at the high voltage coil.

[Rasputin]

...and make sure the condenser is in the circuit- won't spark without it.

Just have to ask... What?

[motoman]

Just have to ask... What?

+1!.

[skids]

It is right next to the flux capacitor Brent!

[Partscaster62]

New problem now

I fixed the spark problem, now apparently I have a air leak somewhere. When I fire it up it and revs to about 5000 rpm, even with the choke on. I do not see any conspicuous vaccuum lines loose. I tried to back off the idle screw as much as possible (not idle mix screws, but main idle adjust - to the left lowers RPM?) that did not work. I just doesn't seem right to let it idle at that speed and spray wd40 around and try to find the leak. Maybe its something else - any suggestions? Thanks!

[ViperRon]

make sure nothing is hanging the carbs open like a sticking throttle cable or something in the throttle mechanism. The other way to test is with pods or Air box off put your hand across the carb intakes and see which one makes no difference as if you are reeving 5000 rpms you are getting a lot of air and that should be quick to test. You also may hear that much air going in.

[Partscaster62]

Thank you! Checked the airbox and noticed it was loose on right side - definitely enough to suck air, but not immediately visible. I'm rollin' !