Arkmage

iTrader: (3)

So... my car started idling rough last week. Now it's getting REALLY bad. I've hooked up the timing light to each lead and all of them are hitting perfect, except cylinder 3 which misses every 6-7th shot.

I've replaced the plugs (gap .044 na) and wires. Resistance on the coils is within .2 kohm of each other and within spec. Any thoughts on why only one cylinder on a wasted spark engine would decide not to burn?

cjernigan

iTrader: (13)

Bad injector?

Arkmage

iTrader: (3)

the misfire is visible with a timing light.... which means I'm not getting spark.

I plan to try to following later tonight after the car has cooled some.

1) Close the gap on the plugs down to .040, from .044.

2) Swap leads on the coil for cylinder 2/3 and see if the problem moves.

Arkmage

iTrader: (3)

So... I just checked and it's the damn coil pack.

When I swapped leads on the coil towers the problem changed cylinders. So apparently I'm going to HAVE to go COP now.

cjernigan

iTrader: (13)

Oh boohoo, that's about the best damn motivation for going COP i've seen.

m2cupcar

iTrader: (5)

I vote 2 - it's happened to me more than once

olderguy

iTrader: (19)

Try cleaning out the coil towers with a brass brush. I've seen a lot of them eaten out and dirty

magnamx-5

iTrader: (7)

damn dirty old man mode now huh bruce

Arkmage

iTrader: (3)

I checked out the coil towers with a flashlight last night... they are nice and shiny inside. I always use a good dielectric grease on plug wires. That's probably part of the reason I can wash my engine without it running like poo afterwards