TOPIC: Spark Plug_Gap Increase Test

- Opened the spark gaps from my default .051" to .081".

I didn't test beyond that, might be able to go even larger. I figure this should make enough of a difference.

Will be anxious to see if any improvements in MPG or otherwise prevail.
Will post results.

here's what my spark plug(#1) looked like upon removing for the first time. The others were't quite as bad.


Corrosion broken free after re gapping



The Gap measurements

JV I use a wire-type plug gap guage or a round disc shaped oue with the tapered ramp on the side. I also then use pliers carefully to center the ground electrode over the center electrode.

But for a gap like 81 thou, maybe ya needed the flat feeler guages!

What brand/type plugs are those, platinum, Irridium,?? That one looked real bad, lotsa miles on those, or other issues, water/coolant getting in the chambers, water/oil emulsion from pcv/breather system, or??? Think I've seen pics like this the plug mfg's called it ash fouling, from ???

But if she runs OK after doing this, then that's OK!

Is this the same car w/ the throttle plate you just re-shaped?

Looks Asian valve cover to me.

Let us know what car and results, Thanks!

Tracy G

Yea, I probably didn't do the best job. I simply used what I had at the moment.

Yes, same car with Throtle-Plate mod.

2000 Honda Civic Ex
Engine: D16y8 VTEC
SOHC (Honda D engine)
1.6 L
4 Cylinder Inline
Manual Transmission


The Spark Plugs, which have been in the car since I bought it used (about 5yrs ago) are:




P.S.
I intended for this thread to be under the 'Other' section of the forum, not 'Groovy Vehicles'