Check Engine Light?

Walmart has a code reader for $25. Anyone who is enough of an enthusiast to be on this board posting should own a code scanner.

Many times, intermittent on/off CE lights will be related to lean/rich conditions, sometimes resulting from dirty MAF's. The MAF gives the computer wrong readings, and then the computer enrichens or leans errantly. THen when the O2's detect the REAL readings (that are outside the norms), you get a CE light.

BUT..best thing is to run the codes.

RC

with a intermittent cel, my first guess would be bad o2 sensors. as rob said, any time the oxygen sensors pull an overly rich or lean reading, your check engine light will come on. run the codes to be sure though.

I do not worry much about the check engine light. Depending on your mods any one of a number of things can set it off. Since my car had a HCI and a vortec supercharger my cel is pretty much a "you engine is warmed up" light. I have had the the thing checked out many times and it has always been fine both under visual and wideband O2 sensor check outs. Once you do enough to your car these things happen. A false read from an O2 sensor is the most likely culprit but check the codes and if you are really worried get someone to check out the engine that knows their stuff. Or dyno it using a wide band O2 sensor and check the AF ratio to make sure everything is cool.

Get new O2's...

same thing happend to me. check ur oxegen sensor. mine went bad because of the weather. same thing happend to my RPM. i replaced the oxegen sensor and everything is fine. don't worry about the check engine light it ok. i got all light on. check engine, air bag, abs, breaks, low coolent and some times low oil. with my stang every thing is possible.