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Missing goes away when warm


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8 minutes ago, Warren Mohler said:

if it's in the morning and possible dampness involved inspect cap and rotor, if all looks good spray some water around cap and wires with engine running to see if there is any spark jumping

Will do, thanks!

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That happens to me once on a 91 Cherokee I had awhile back. It got so bad that I would have to start it. Then it would die after a few seconds. And I would have to start it over and over again till the engine got warm. Then it would run fine. I finally chased it down to a bad cam sensor in the distributor. Once I replaced it it ran fine.


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18 minutes ago, Gt-401 said:

That happens to me once on a 91 Cherokee I had awhile back. It got so bad that I would have to start it. Then it would die after a few seconds. And I would have to start it over and over again till the engine got warm. Then it would run fine. I finally chased it down to a bad cam sensor in the distributor. Once I replaced it it ran fine.


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Noted! I appreciate it!

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Sounds like a moisture thing.  The coil mounts to a distribution block that is potted on the bottom.  That potting cracks with age and allows moisture in, causing everything from misses like this to complete no-start conditions.  Had one fail in my 87 MJ.  Was wondering why it was acting finicky for a few months, then it completely failed and I figured it out.

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2 hours ago, Andy in Pa said:

Sounds like a moisture thing.  The coil mounts to a distribution block that is potted on the bottom.  That potting cracks with age and allows moisture in, causing everything from misses like this to complete no-start conditions.  Had one fail in my 87 MJ.  Was wondering why it was acting finicky for a few months, then it completely failed and I figured it out.

How much did it cost to fix?

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https://www.oreillyauto.com/detail/b/import-direct-ignition-4488/ignition---tune-up-16776/ignition-module-control-unit-ignitor-12521/e281cd9fff15/import-direct-5-terminal-ignition-control-module/140197/4575249

This is the link to the one I bought from O'Reilly's. We have had good luck with import direct parts at work. I replaced mine beacuse the bottom was cracking like Andy was describing. Mine finally gave up when I soaked it flushing the heater core.

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21 minutes ago, JMO413 said:

https://www.oreillyauto.com/detail/b/import-direct-ignition-4488/ignition---tune-up-16776/ignition-module-control-unit-ignitor-12521/e281cd9fff15/import-direct-5-terminal-ignition-control-module/140197/4575249

This is the link to the one I bought from O'Reilly's. We have had good luck with import direct parts at work. I replaced mine beacuse the bottom was cracking like Andy was describing. Mine finally gave up when I soaked it flushing the heater core.

:L:

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1 hour ago, JMO413 said:

https://www.oreillyauto.com/detail/b/import-direct-ignition-4488/ignition---tune-up-16776/ignition-module-control-unit-ignitor-12521/e281cd9fff15/import-direct-5-terminal-ignition-control-module/140197/4575249

This is the link to the one I bought from O'Reilly's. We have had good luck with import direct parts at work. I replaced mine beacuse the bottom was cracking like Andy was describing. Mine finally gave up when I soaked it flushing the heater core.

Yep that's the one.

 

A.

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