11-30-2007, 01:48 PM
Join Date: Nov 2007
02 Tahoe two o2 codes and random misfire.
hello all. I just bought a 02 Tahoe,93k miles,5.3,4x4 ls. Ive got three codes and truck runs rough only on a cold start- 45* or colder.
I'm an ex-gm tech,but electrical was my job, never did much on driveability.
1) p017 bank 1 lean
2) p0174 bank 2 lean
2) p0300 random misfire.
i dont think both o2's would go bad at once since both banks reading lean.i think its something common for all cylinders. i did some matinence;
1) new plugs/wires
5) unhooked vacuum on FPR and no change....
anyone seen this before? going to check fuel press this weekend. scanned again this morning when it was running a little rough and only pulled the 300 code, no o2 codes. any thoughts. clean injectors? bad MAF? gas cap (even though no 400 codes?)
thanks in advance, Gary.
chevy all the way.