[s-cars] Urgent.. UrS4 vibrates...

[Brian Powell]

> Actually Joe, I believe Brian Powell has a rather interesting coil tester.
> Perhaps he will chime in with his methodology (I think there is something of
> an art to reading how far, or in the case of a not so good, unhealthy coil,
> how not so far, a spark will jump.   From an email exchange with Bruce Mock
> May 31 links .... 

Mike, et al., I can't claim the tester we used on your car as mine.
Denis Iler created that contraption, and it works quite well. My
original tester only works for one coil at a time; however, Denis did
a full test.

Basically, take a piece of plywood that is as long as the head and
equally as wide (for Joe, that means a square). Just take a standard
metal level attach a wire to it and ground it. Run some string through
the two ends of the level for use later. next, pull the coil pack off
(disconnect all of the fuel injectors) and lay it on the plywood. Use
some bungee to hold everything together. Take some spare spark plugs
(or remove the ones in the head) and connect them to the coil boots.
Move the level to within about 2cm of the spark plugs, and make sure
the points are all equally spaced from the plug end to the level. Have
someone start turning over the car, and using the string, gently begin
pulling back on the level until one of the coils no longer bridges the
gap between the plugs and the grounded level.

We did this with Denis' car and found coil 4 was failing prematurely,
we did it with Mike's car and several of the coils failed with only
.5" distance.

Sorry for the quick description, but, it should give an idea.

-- 
Cheers,
Brian