i have a 91 firebird tbi and i have had the check engine light come on after i took off the cat and put on the headers. it would normaly go on when i drove it hard recently it has come on more often and now its always on. i have posted before about my car starting rough and then smoothing out before. tonight i went to start it and it ws rough and i gave it gas and it died then i tried letting it go with no gas and it died again can the egr be doing this or something else
please help

 

yeah the egr or something else could be causing your problems. have you tried to trouble shoot it or trace down the codes?

 

Two things, first try to diconnect your battiery to reboot your computer. Second when your light came on what RPM were you at?? IT might be your EGR at the high rpm range. Good luck. Stupid wuestion, but are all of your plug wires on and plugs all the way in? Just try to KISS keep it simple stupid. That has worked more than I care to admit in the past for me.

 

i replaced egr but still has the check engine light on at idle what is the little box with the plug in and it has a hose running from it to the egr i ran my car and pulled the hose off of the egr and there is no suction or air movement for that matter could it be the sensor or whatever it is isnt working

 

not sure if you can just test for suction like that... but yeah that hose moves the egr diaphragm using vacuum...

if you disconnect it, egr will not engage, which is OK (not for emissions, though), so if the problem persists, it's something else...

I'd check the injector spray.. take the aircleaner off... visual inspection will do for starters.. if you see leaks or drops, especially at idle, you'll know your injectors are screwed...

I had a similar problem half a year ago:
https://www.thirdgen.org/techbb2/sho...threadid=87261