i've been getting an EGR code now for awhile.. the SES light stays on almost constantly now and when it's on the engine runs like poop.. when it's off, it purrs.. after clearing the codes with the battery dc'd it now only triggers 32.. SO... EGR is probably sticking, right? How does it work? I can't check it with a vacuum gauge right? It's an '86 305tpi IROC.. 139,000 miles... anything i should know before yanking off my plenum to change the EGR?

------------------
'86 IROC-Z 305/auto with no cat, performance chip, shift kit, and 4.11s
'87 IROC-Z factory loaded with every option, 84,000 miles

Webmaster: www.IROC-Z.org

 

Go here for info: www.weekendmechanicsclub.com/ACDelco/vobeng1.htm

 

i had a general idea how it works, my question is this.. if the EGR is staying closed at idle, would the O2 sensor read a lean condition and then richen the mixture causing it to run rough? My car smells a little gassy when the light is on, but it always has because I think it has a chip. I've never pulled off the kickpanel and looked at the ECM, maybe I should do that. There's such a massive difference in how it runs, what would happen if the EGR wasn't operating correctly?
Thanks for the page though, it's bookmarked now and I'll put the link up on my site.

------------------
'86 IROC-Z 305/auto with no cat, performance chip, shift kit, and 4.11s
'87 IROC-Z factory loaded with every option, 84,000 miles

Webmaster: www.IROC-Z.org

 

i have found the egr stuff sucks, but is necesary. you are best off replacing it since it has miles on it. just confirm it is getting a vacum signal. When u got to replace it, Do not pass go, do not get 200 bucks, as to say, DO NOT GO TO pep boys or napa or anything. u are best off getting the right one. write down the number off the top of it and go to the dealer. there were 3 different types of egrs and only one will work.

Steve

------------------
86 Firebird, LG4, t-tops, 2.73 open rear, SLP 3 inch cat back exhaust, catco cat, Coming mods: Edlebrock 1 5/8's Headers, 2 inch cowl hood with custon alumin cold air box, 3.42 posi disc rear, T56, and hopefully a new set of heads and a nice CAM!

My Webpage- Battle of the birds, My own Thirdgen Page, still under construction, http://www.geocities.com/soares711/index.htm

88 Firebird Formula- deseased 2/9/99- 305 TPI, SLP 3 inch exhaust, SLP Intake runners, SLP cam, 3.45 BW disc brake posi, WS6, NOS, and all that good stuff, 13.8 on the motor, 12.89 on NOS and slicks! Hit by what else!?!? a FORD EXPLORER!!!!!!

 

There's a tech article here on how the EGR works as well.

------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

thanks Kevin.. when are we gonna get together and hit some car shows?