16v Ignition Woes

[jlagnese@massed.net (John Lagnese)]

Make sure the grounds are good. A computer burned out on a Golf of mine when the
ground was bad. It also caused apparent fuel pump problems.
John


John Erickson wrote:

> My car quit last week and, per the Bentley, I had a bad ignition control
> module.  I replaced it and the car started right up.  I've been doing other
> work so I didn't drive it much.  I started it up today and it ran for
> awhile, then it quit again.  It appears to be the ICM again.
>
> When the first one failed, the test on terminals 1 and 15 of the coil
> indicated no voltage jump to 2 or more volts when I grounded pin 12 of the
> knock box connector.  On this one, I get a steady 7.5 volts on pins 1 and
> 15 as soon as I turn on the ignition and nothing happens when I ground pin
> 12 on the knock box connector.   Out of curiosity, I tested the
> coil.  Primary is 0.8 ohms and the secondary is 4K.  According to the book,
> the secondary should be between 6.5K and 8.5K.   I think the coil issue is
> secondary to the ICM problem though.  It should work OK at 4K, but it might
> be a little weak.  8v engines have 3.5K ohm secondary coils.
>
> Also, on a side note, prior to the second failure, my fuel relay was going
> nuts.  Absolutely clicking like crazy.  I believe the signal that comes
> from the knock box (pin 12) actually starts with the ICM, doesn't it?
>
> Soo...  a run of bad luck or is something killing my ICMs?  I noticed the
> ICMs are marked as rebuilt units.  There must be some kind of failure rate
> if they are rebuilding them.
>
> Nothing was done to the car prior to the initial ICM failure BTW.  I do not
> believe I did anything to induce the failure.  I've just been driving the car.
>
> That's enough.  I'm frustrated.
>
> John
> Long Beach, CA
> 87 16v
>
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