too rich,both banks

sierrablues · April 1, 2004

i cant pass e check because of codes,too rich both banks.dealer told me it was either regulator,injectors or crack in fuel meter body.(96 gmc sierra C.P.I.) i relaced all of it and drove it a while and it runs perfectly but the check engine light came on again with the same codes,too rich both banks.could somebody please offer any suggestions? thank you in advance!

citydriver · April 2, 2004

Try checking the fuel pressure and make sure that its within specs...I would also try to replace the 2 O2 sensors B4 the converter,especially if they r the originals,

slow or clogged O2 sensors may also trigger the "too rich" codes...just a guess

badhammer · April 2, 2004

have you checked the air filter? if it is plugged up it will run rich and set codes

sierrablues · April 4, 2004

thanks,i had considered both of those.i already replaced the air filter now i will try the o2's.they were replaced once several years back though.

jryerson · April 7, 2004

I had the same problem with my 96 chevy 5.7. Kept coming back with the same rich codes on both banks. I changed all 4 O2 sensors with no change. Finally I removed and cleaned the egr valve. This seemed to fix the problem because I have yet to get the ses light back.