Check engine light, WHY is it not on?

[matt]

i did, so were a few other lights but they all went off after ignition ex the abs light (abs didnt quite work)...i wasn't running after-cat o2 sensors (obdII) for a while, then i added O2 sensor simulators and no change. what are your thoughts?

I guess if its on when the car is off then off when the car is on, you are in the clear.

[DatUtahGuy]

Sorry to revive an old ass thread but I feel it's better to contribute to this one than start a new one.

I currently am having the same problem than some of you had, if the car idles for 15-20 seconds the check engine will come on, and usually the tach bounces slightly up and down. As soon as I give it gas, the light goes off. It does smell rich at times.

I was guessing O2 sensor, did any of you find that was the problem?

[brandon11130]

I have the AGK plug, and i dont have a check engine light at any key position. Im pretty sure they didnt include it.

[matt]

Sorry to revive an old ass thread but I feel it's better to contribute to this one than start a new one.

I currently am having the same problem than some of you had, if the car idles for 15-20 seconds the check engine will come on, and usually the tach bounces slightly up and down. As soon as I give it gas, the light goes off. It does smell rich at times.

I was guessing O2 sensor, did any of you find that was the problem?

What code does it show?

[DatUtahGuy]

Lambda code, so basically the air/fuel ratio is off and the engine is trying to compensate.

[matt]

Check for vacuum leaks. Do you have the correct fuel pressure and the correct injectors for your chip?