Engine Check Light comes on, Engine Check Light comes off

[RatedR]

Sup Fellas~! My 240's doin some weird things, this has happened before, then it went away. (A total of 2 times) While driving, my engine check light will come on, no difference in the car's performance what so ever, then it will come off...all on its own. I tried to see if there were any vaccuum lines amiss, but I couldnt see anything wrong with it...plus I raced it around with the engine check light on to see if it would bog/stumble, and nothing~! The light would stay on about 2-3 mins, then it'll go off...my car's completely stock so I doubt it's the intake/header/exhaust, they all seem to work fine...

Any thoughts????

-R

[RYNO_s13]

For some strange reason, running at low RPM will cause this to happen. the engine runs rich at low rev, so running for a few minutes over 3k RPM will usually turn the light back off. Common problem from what I've seen.

[RatedR]

Hhmmmmm, come to think of it, my car was just turned on when I experienced it... I didnt notice any difference, so I didnt really worry about it much, just curious. Thanks RYNO, anyone else have anything to add???

[RYNO_s13]

Your check engine light will come on when there is a problem with emmissions. I'm not sure off the top of my head where I read that, but basically anytime your emmissions get above a certain level, that thing comes on. that being the case, when you take it to get smogged, make sure it isn't on.

[RatedR]

I know that much about my car, I'm just wondering if its anything like a leaked vaccuum I cant find....but thanks again RYNO

[RYNO_s13]

I'm just wondering if its anything like a leaked vaccuum I cant find.

That's what I'm trying to tell you. It's just a case of the car running too rich because your RPM is low. There isn't a vacuum problem. I've seen at least 5 240's do the same thing. It's nothing more than a glitch. That's why it's intermittant. Next time is does it, get on the freeway. I didn't mean my reply to seem like you know nothing about your car, just that this is one of those things where it's such a goofball problem, everyone I've seen it happen to has done the same thing and overcomplicated the problem.

[RatedR]

Cool~!

[b240]

I think actually your right Ryno. Ive heard that after a certain amount of miles you get a check engine light , and it just has to do with emissons.

[Nick_240]

I have a busted speedo and that seems to turn on the check engine light. Does your speedo work?