[s-cars] 1993 S4 ignition problem.

[Jerry Scott]

I had a similar problem a while back and seem to now have it fixed.  
First you must determine what cylinder is misfiring. If the car is 
misfiring during idle, this is very easy.  Do this by removing the 
injector connectors one at a time while the car is idling.  You will 
hear a speed change as you do this on all cylinders except the one that 
is misfiring.  Once you have located the cylinder, switch the POS units 
and note if the misfire now has changed cylinders. If not, its likely to 
be a problem with the spark plug boot or the coil pack for that 
cylinder.  I changed the #2 plug and plug boot, but this did not fix the 
problem.  Finally, I changed the #2 coil pack including the wires all 
the way back to the connector.  This is important, since the insulation 
on these wires will sometimes crack and cause arcing to ground, 
intermittently.  This fixed the problem for my situation and it has not 
misfired for months.

Good luck,
Jerry Scott
303-697-1556

glenn chow wrote:

>Hi,
>I am trying to solve this ignition problem.  One of the 5 cylinder is not firing. I have replaced the direct ignition coil. Check the pair of wires for continuity.  Replaced the spark plug.  No positive result yet.
>Has anyone experience something similar to this.
>Please help.
>Glenn
>
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