[Diy_efi] 928/749

[Adam Wade]

----- Original Message ----- 
From: "Bill Shaw" <b.shaw at comcast.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, August 15, 2007 8:23 PM
Subject: [Diy_efi] 928/749


> The only weird thing I can put my finger on is with spark.  I move 
> my inductive timing light from wire to wire checking for spark on 
> all 8.  I'll find one not firing (it changes some times),  pull the 
> wire off the spark plug,  insert another spark plug in the wire and 
> ground the tip on the block and it will fire,  the timing light will 
> light up.  Move the wire back to the plug in the block and it won't 
> fire.  Pull the plug from the block,  put it in the plug wire and 
> ground the electrode on the block and it will fire again.  WTF??? 
> This is driving me nuts.  I've pulled one plug wire off 3 times to 
> check resistance, wiggled both ends and the whole wire looking for 
> an intermittent break,  everything is great,  3.1k ohms per spec.

It's very common to see that sort of thing.  A weak spark can often 
result in jumping the gap at atmospheric pressure, while not jumping 
the gap when trying to light off compressed mixture in a combustion 
chamber.

Find the source of your weak spark, and I imagine things will take 
care of themselves once you fix that.

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>
> I'm running out of ideas.  Anyone have a thought??
>
> Thanks,
>
> Bill
> 928s 5.0L Vortech/749
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