It ran fine one day the next day it ran fine in the Morning and then started idling and running bad after that

MADELYNN

MEMBER
1991 FORD EXPLORER
4.0L
6 CYL
2WD
MANUAL
1,000 MILES

I replaced the coil pack because it was idling bad. It ran fine one day the next day it ran fine in the morning and then started idling and running bad after that. What could possibly be the problem? Not getting any spark to number two and five cylinders.

5 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

That sounds like a bad ignition control module. There are actually three separate coils and you may have lost the driver for one which is in the module.

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Sunday, October 2nd, 2016 AT 3:24 PM

MADELYNN

MEMBER
3 POSTS

Okay, my husband found a what looks to be a condenser next to the coil pack which the wire that was on it came off. Do we need it for the spark? And where I would find the ignition control module? Please help.

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Sunday, October 2nd, 2016 AT 6:20 PM

WRENCHTECH

MECHANIC
20,757 POSTS

That is just a noise suppressor for the radio.

You have to remove the battery

https://www.2carpros.com/images/external/41854547.gif

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Sunday, October 2nd, 2016 AT 6:24 PM

MADELYNN

MEMBER
3 POSTS

Okay, thank you. I found it.

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Sunday, October 2nd, 2016 AT 6:38 PM

KEN L

MASTER CERTIFIED MECHANIC
42,895 POSTS

If I may, it could be two bad injectors, I had one in the shop had the exact same problem.

Here is a guide to help you.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please let us know what you find so it will help others.

Best, Ken