[allenh318]

I have realized I am addicted to trying to increase mpg's on my truck! I made a front air dam with garden edge today. Earlier this week I blocked off my grill except for the radiator (not sure I want to close it off yet), and am checking my tire pressure weekly and running them 3 to 4 psi over the max. I found out today that when I put the obd 1 code reader on while the engine is running it will go into "field diagnostic mode" so I can see how quickly it goes into closed loop and then whether it is running lean or rich by how the lights blink. This helped me see the O2 sensor seems to be working and how and when the rich and lean conditions correspond to the vacuum gauge I have. Sorry about the running on but my wife's eyes glaze over when i talk about this stuff. Lastly, does anyone know if running a vehicle in field diagnostic mode for longer periods can cause any damage?