1987 5KTQ Coil Test

DeWitt Harrison six-rs at comcast.net
Fri Apr 28 22:22:28 EDT 2006

On Fri, 28 Apr 2006 14:07:05 -0400
    "harchris" <harchris at smokesignal.net> wrote:

> [ ... ]
> Problem:
> It still runs poorly under acceleration. It runs and pulls smoothly
> the 2 - 3k rpm range, but at about 4k rpm or 1.2 on the boost scale, the
> drops off and it stumbles. In my quest for the problem I tested the coil.
> Bentley on pg 28.24 explains how to test for resistance in the coil. My
> has resistance in the correct range for the test between terminal 1 and
> hitension connection, but between term 1 and 15 I have no resistance. I
> the same reading on three different coils. Are all 3 bad? Does anyone know
> a source for these coils?

With these old beasts, it could be many things. But my gut feeling is that
stumbing under acceleration, you ought to check the codes for a bad
intake air temperature sensor. Next time you put your foot into it, try to
notice whether your engine light flickers a bit.

DeWitt Harrison
'88 5kcstq

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