EGR O2 Question

ChunkFunky · 07-07-2003, 04:36 PM

ok, I had stock headers for a while and each side had a broken stud, so each side of teh H pipe had an exhaust leak. I finaly got new BBK headers in place and bolted it all up nice and I'm getting a check engine light after about 10-15 minutes of driving... I pulled codes and got 31, 41, 91... 31 is something with the EGR and the 41 and 91 are O2 leans... though not sure why there's TWO codes, unles it's one per side... this is the only mod I made...the only thing I can add is, one of the vacum lines on teh pass fender area that comes from that 4 way vacum distro and goes to the first valve on teh AIRPUMP tubing got melted. so I cant tell if it's sealed off and cauterised ...or leaking... eitherway... that's not an ENGINE vacum source anyway, is it?.. woudl that cause enough of a vaum leak? the tube is that hard plastic stuff.. i'll try to get a new one... but it just seems so miniscule to make these codes come up. though I cant imagine what else it could be, unless the EGR went bad coincidentaly... or the O2s are crapped up from having so much of an exhaust leak before them..
-as

07-07-2003, 04:36 PM	#1
ChunkFunky Registered Member Join Date: Apr 2002 Location: Tustin, CA Posts: 465	EGR O2 Question ok, I had stock headers for a while and each side had a broken stud, so each side of teh H pipe had an exhaust leak. I finaly got new BBK headers in place and bolted it all up nice and I'm getting a check engine light after about 10-15 minutes of driving... I pulled codes and got 31, 41, 91... 31 is something with the EGR and the 41 and 91 are O2 leans... though not sure why there's TWO codes, unles it's one per side... this is the only mod I made...the only thing I can add is, one of the vacum lines on teh pass fender area that comes from that 4 way vacum distro and goes to the first valve on teh AIRPUMP tubing got melted. so I cant tell if it's sealed off and cauterised ...or leaking... eitherway... that's not an ENGINE vacum source anyway, is it?.. woudl that cause enough of a vaum leak? the tube is that hard plastic stuff.. i'll try to get a new one... but it just seems so miniscule to make these codes come up. though I cant imagine what else it could be, unless the EGR went bad coincidentaly... or the O2s are crapped up from having so much of an exhaust leak before them.. -as __________________ '89 GT Convertible: TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit

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