Why You Should NEVER SKIP YOUR IGNITION COIL DURING A TUNE-UP!! ACDelco D503A Ignition Coil:
In this video I went to swap my ignition coil in my 1995 GMC Suburban only to reveal the fact that it was indeed broken to begin with... I was going to just change the original equipment ignition coil as part of a tune-up and when I went to pull the ignition wire from the top, out came the electrode with it. Who knows how long this has been broken but it's starting to make a few things I've been wondering about make more sense.
1. Low power; possibly caused by weak spark to the spark plug.
2. Running rich; again possibly caused by weak spark to the plug.
3. Random misfire under load; caused by weak spark...
I probably would've at least caught it during the plug wire change but man. What a find!!
Suburban, Tahoe, Yukon, Sierra and Silverado are all the same platform vehicle from 1988-1998 the GMT-400 and should all be similar.
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