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Old 07-25-2013, 03:15 PM   #1
OCTurbine
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How to disconnect Zetec coil pack for testing?

Howdy, y'all,

Firstly, searching this forum isn't working. I attempted a thread search for the string "coil pack" and the webserver returned a "loading" message, but nothing was displayed.

I'm trying to fix an intermittent stalling-at-warm-idle problem. I've replaced the IACV, the PCV valve, and the PCV tube vacuum hose. I checked the rest of the vacuum system and found no leaks. A local shop also tested for a vacuum leak using a smoke tester. None found.

I'm gonna check the coil pack, even though there's no strong evidence of ignition failure. The plugs and wires are new and I carefully retorqued the plugs to 10 ft-#. There was a wiring problem that caused an ignition fuse failure couple months ago, so I'm suspicious of the coilpack control wiring.

But how do I remove the coilpack connector? My Haynes manual doesn't say.

Oh, never mind. Found a useful video at YouTube, but I'll post anyway just in case anybody has another tip:
http://www.youtube.com/watch?v=BxvcAwNzanc

Coilpack testing:
http://easyautodiagnostics.com/ford_...cus_coil_1.php

Thanks much.


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Old 07-25-2013, 03:34 PM   #2
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Have you tested the TPS?
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Old 07-25-2013, 04:38 PM   #3
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Here are my results from searching "coil pack"

http://www.focusfanatics.com/forum/showthread.php?t=281582
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Old 07-25-2013, 05:43 PM   #4
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Could easily be the TPS. BTDT.
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Old 07-26-2013, 03:24 PM   #5
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I'll check the TPS

I'll check the TPS as described in this thread:
http://www.focusfanatics.com/forum/a...?t-263152.html

I have an OBD-II scanner, so I'll check the Absolute Throttle Position, which should be 0% at engine idle, and 100% at wide-open throttle (WOT).

I'm increasingly suspicious of the EGR system so I'll also check the Commanded EGR parameter (0% when EGR is off and 100% when on), and the EGR Error parameter. The owner of the Focus took it to a tech for repair of a short that caused the ignition fuse to blow. She seems to think that the warm-stalling-at-idle problem began about that point.

Thanks much.
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