please help, engine troubles Options

[jayi12-15psi]

guys, my engine has been idling rough lately, I am noticing a hissing noise coming from behind the intake manifold, and I have lost a little bit of acceleration, plus a little bit of backfire. Now I know thaT Backfire is caused by leftover fuel that wasn't burned.

so my question is, Is there some kind of sensor calling for more fuel? Is there some kind of vacuum hose loose?

any ideas would be helpful

oh and I've heard that the check engine light usually relates to pollution control devices in the engine.

please help me with any ideas.

-Jim

[edo17982]

maybe that's te O2 sensor.
If it doesn't work properly for sure you'll have some air/fuel mixture problems.
It checks for the a/f ratio and it require more or less fuel depending of how rich or lean is the mixture. check for it.
As Ed said shouldn't be the MAP sensor, also cause if it doesn't work, your idling is fine but as you try to accellerate the engine stalls and can't raise RPMs due to a basic data missing.(it can't read the quantity of air entering in the manifold)
Hope this helps!!!

This post has been edited by edo17982: May 29, 2003 - 5:20 AM