Checking a 2000 4.2 Coil pack
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From: B'ville, WV
Checking a 2000 4.2 Coil pack
Hello, I was just wondering if anybody would know Ford specs on the coil packs.
I was checking mine, following the specs listed in my Haynes Manual. My coil pack was bad according to those new numbers. The confusing part is, I went to a Ford dealer parts dept. and checked the resistances on the new part. The new resistances were about the same.
On the secondary side the old was 13.47 K-ohm, the new was 13.67 k-ohms. The sec. range according to Haynes was 7-11.5 k-ohms, I believe. I don't have the book in front of me.
Is it bad or not?
Thanks,
Rich
I was checking mine, following the specs listed in my Haynes Manual. My coil pack was bad according to those new numbers. The confusing part is, I went to a Ford dealer parts dept. and checked the resistances on the new part. The new resistances were about the same.
On the secondary side the old was 13.47 K-ohm, the new was 13.67 k-ohms. The sec. range according to Haynes was 7-11.5 k-ohms, I believe. I don't have the book in front of me.
Is it bad or not?
Thanks,
Rich
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Joined: May 2004
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From: B'ville, WV
Thanks for the reply, Franklin2. My truck doesn't have the COP system, so it would have to be the other.
Haynes manual for 97-2002 Ford PU and Expedition(36059) page 5-4, sec. 7
Specs on 5-1. Is this the same thing you are looking at? The funny thing is, if you look at pic 7.2, the secondary resistance they show in the pic would indicate it is bad according to the specs. The new one I checked was about the same. ??????????
Haynes manual for 97-2002 Ford PU and Expedition(36059) page 5-4, sec. 7
Specs on 5-1. Is this the same thing you are looking at? The funny thing is, if you look at pic 7.2, the secondary resistance they show in the pic would indicate it is bad according to the specs. The new one I checked was about the same. ??????????
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From: Virginia
Well, I would believe the new one you measured before the book. One other thing you can check is take a test light and put it on the negative or "tach" terminal of the coil. Put the other end of the test light on a good ground. Crank the engine. The light should flash on and off.
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Senior User
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From: B'ville, WV
Thanks, Franklin2. The truck is running pretty decent, so it must be fine. I just got curious about the difference between the Haynes spec numbers and what I was reading...well and the new one. I wonder at what point a Ford tech would say the coil pack needs replaced, based on resistance. When the truck won't run? 
Anyway, thanks again.
Rich
Anyway, thanks again.
Rich
