As Willwren told somebody, "Wait long enough and it will completely die.. then you can figure out what the problem is." ... or something like that.
The missing symptom that should go with Missing Under Load (and acceleration) suddenly appeared w/starting up RedSled today. "Missing and Sputtering at Idle"
2 Coils finally died on one cylinder each
- I used the test procedure in the FSM, which is
- Start engine; allow to stabilize; unplug IAC motor (not to exceed 2 min.); use insulated pliers (AND a rubber glove is great too); pull one plug wire at a time while listening for miss to get worse or stay the same.
I did this at the coil end and noticed something that I should share. The Bad side of the coil would NOT arc over to coil body
when one wire was pulled. But the other side WOULD arc back to the coil body with the wire off.
2 cylinders on the coils were not arcing back... #2 & #6. The other 4 would arc like a lightning storm (the latter is a GOOD thing). I figured that if a coil died, BOTH cylinders would quit firing. But that is not true, at least in my case. Each of the 2 bad coils had a good cylinder and a bad cylinder.
Even though all the coils had passed the resistance test days previously, both the 2-5 and the 3-6 secondaries are now OPEN/infinity
Fortunately I still had those 2 used coils from the yard. Something tells me the 3rd coil may not be far behind. So a replacement is in line for that on.
Also, Willwren'* statement that stumbling/shuttering in OD/Lockup is usually ignition has proven correct.
I'm happier than a pig in mud. RedSled can finally spin her tires again! AND the exhaust now smells normal and not running rich.
Ought to be good for 5 or 10 more miles to the gallon, if I can keep my foot out of it. I have lots more, non-motor stuff to work on, so "I'll be bach."