And in keeping with
@TJBaker57 's clever analogy...it will depend upon whether you check the Misfire Counts and either can Dial In on ONE Particular Coil Over Plug...(P0301- P0306)... or conversely, have a Raft of Random Misfires (P0300) based upon Asymmetric Misfire Counts as -=
Real Data=- to consider before purchasing all six COPs...versus a Data-Driven R&R that would justify paying more for a single OEM Quality ACDelco Coil Over Plug. The better the analysis of the historical record is... the less the impact will be upon your wallet--> $
vs. $$$$$$
An important consideration would be a check of your EFIs to isolate a *Poor Performer* as per THIS Video from "The Scanner Danner Brothers" Paul and James Scanner worth watching and understanding:
Totally Agree with
@Mooseman 's assessment with either having Off Brand or Incorrect Spark Plugs or if you discover Carbon Traces...
(Look For Carbon Tracks on the OUTSIDE of the Porcelain Insulator(s) and-or on the INSIDE of the Insulator Rubber Boots for signs that the Spark Line is Firing OUTSIDE of the Cylinders.
This will show up on an Oscilloscope Wave Form too for a Failed Coil On Plug caused by FUEL STARVATION...or Un-Controlled AIR Supply) via HIGH SECONDARY WAVE FORM OSCILLATIONS feeding back inside of the Primary Coil ...and Destroying IT.
"COP FAILURES ...CAN BE CAUSED BY A FAILING FUEL PUMP AND POORLY FUNCTIONING OR CLOGGED EFI!s..." --=mrrsm=--
PS...
"What Am I LOOKING For in the COP Known Bad Wave Form?"
If you look at this Two Channel Ignition Wave Form Capture... Focus on the -=
EXCESSIVE OSCILLATIONS=- occurring in the Tail End of the Yellow Secondary Wave Form Trace... There should ONLY be 3 to 5 Oscillations in that line (See the Red Arrows,,,?) showing that the Residual High Voltage is DISSIPATING:
Known GOOD COP Secondary Wave Form:
Whenever an issue with a FAILED GROUND to the Primary Coil Side of the COP occurs, these Two Comparison Wave Forms describe what happens when an Internally Shorted Coil in the Primary happens
(Red is PRIMARY and Blue is SECONDARY). All Credit to ScannDanner.com:
Whenever there is
NO PLACE TO GO for this High Electrical Power to Dissipate.. .it will
HAMMER its way back inside the Primary Coil (Green Trace) and
OVER-HEAT THE INNARDS and eventually Destroy the COP! Excessive In-Cylinder LEAN Fuel to AIR Conditions can cause this event to occur:
One Last Precautionary Mention here...
You probably will not have a High End Snap-On Verus or similar Scan Tool with a Built In 4 Channel Oscilloscope...so *IF* you wind up using an Inexpensive Hantek Model# 1008C or the PICO-Scope Model# 2204 versions with your Laptop Computer and their FREE Auto Diagnostic Software...PLEASE ...Remember to attach a Hantek 20:1 Voltage Attenuator to EACH of your Scope BNC Connectors ahead of your Two Probe Leads... or the High KV in the COPs Secondary and the EFIs will Destroy your Scope!
