RPM's

straightlinespeed said

I suppose your are correct. The more I thought about this, the more spots I thought of.

So when I do something like this, Im assuming I make sure the car is fully tuned to where I think it should be. When I pull the plugs what am I looking for exactly? Just making sure they are the correct color etc???

Click to expand...

Yes, plugs will change appearance pretty fast under changing operating conditions; if the mixture was rich at hard throttle and put carbon on the plugs, for example, backing off and running at light throttle for any distance at all would burn off the carbon from the plugs and you would never know the actual hard throttle burn conditions.

Of course, a wideband O2 sensor does some of what plug reading does; not everything, but it is the fast, automatic way to take some readings.

If you are in a bad part of the city, just turn your googly eyes in your avatar pix on them and they will back off!