Continuing the discussion from Misfire… New wires arcing? : I have a 2003 Pontiac Bonneville SLE and my check engine lights come on for periods of time…Sometimes it blinks on and off when accelerating or going up a hill…Autozone pulled a P0300 CODE which means random number 3 cylinder misfire…What i…

The root cause is usually a misfiring spark plug. Over time a spark that is jumping can damage the plug wire or coil boot as the case may be. With the spark plug out I would advise running a compression check on that cylinder. Low compression can cause a plug to misfire which in turn, yada, yada, …

[image] Tone1873: Will it be wise to replace all spark plugs, spark plug wires Yes, if one set of wires is starting to arc, odds are the others aren’t long behind it

Yes,change them…thats an easy doityourself project. All you need to do is identify where all the wires go.

Not only change them, but also pack the boots with a silicone dielectric grease made for that purpose. It will help prevent future arcs, preserve the boots and sometimes will prevent arcing if the coil tower is cracked, which often happens when arcing has occurred for a while.

Thanks I will do just that…Replace them all at the same time. And pack the boots with the dielectric grease.

I would do the wires one at a time too, just to make sure you don’t cross up the connections

You are going to do plugs too aren’t you? A little coil theory here if you don’t mind. A connection is made to apply 12vdc to a coil. Current starts to flow but it is opposed by the induction of the coil. The voltage slowly overcomes the induction and more current flows. Current flow increases …

I would only add that only the correct plugs should be used. That info may be on an underhood sticker or in owners manual.

Here’s something that nobody else mentioned . . . as far as I know Carefully check the coil tower(s) . . . they do sometimes wear out, which results in a poor fit, and often a misfire Make sure the wires are in good shape . . . boots and insulation. I wouldn’t be surprised if the insulation is br…

Spark Plug Wire Arcing at Spark Plug Wire Boot and Ignition Coil Connection

Maintenance/Repairs

Tone1873 February 20, 2018, 8:42pm 3

Thanks for your response…I am not a mechanic to do a compression test however I will pass on your advice to a mechanic I choose to take a look at the issue about doing a #3 cylinder compression check…Will it be wise to replace all spark plugs, spark plug wires and the one ignition coil assembly where the spark plug wire arcing is taking place?

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Spark Plug Wire Arcing at Spark Plug Wire Boot and Ignition Coil Connection

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