[T3] Cylinder Performance

[Mike Fisher]

Have you ever run a compression test on the engine?

On Fri, Jun 17, 2011 at 6:00 PM, Adriel Rowley
<adriel_rowley at hotmail.com> wrote:
>
> Now that the Squareback can be driven (have turn signals but still odd wiring and no headlights or idiot lights. F.Y.I.) wanted to figure out why number three cylinder is not firing or poorly.  To start off the day of diagnosing, there was debris between the head casting and the spark plug, so as I could not get the socket on the spark plug, so off came the runners.  I tried a magnet, would not pick up but went to number four, and then ended up wedged in between the fins, so left it.  Pulled number three and was fouled: black as coal.  Wire wheeled it, and reinstalled.  Checked four, and was clean as it was when I put it in less than 25 miles ago (unknown hours though).  Therefor, figured number three must be getting too much fuel, and checked number three injector beside four.  Got a bit of a stream rather than number four's fog.  So, swapped to another injector but did not test, ASSuming it was fine.  However, with engine running, still is not quite right.  Pulled the number three spark plug wire from the distributor cap, I get about half the response as I do from the others.  I do notice the spark is brighter than before, but hard to be sure in bright light.  I am now thinking after all the sitting with gasoline the injector did in its life, might need cleaning.  So sending out a set to be tested and cleaned, since I have heard this strong recommendation many times but thought all was fine.  Lesson learned: prevent rather than fix.
>
> My question is how much of an affect does variations in spray (already know what streaming does) have on cylinder performance, i.e. variations of fine atomization.  Also, what about spark plug gap?  I am using the disk gapper, so thinking I could be in the range of 28 to 30 thousandths, and do not know if this is something to be aware of.
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