89 4.3 TBI Code 45

[bigaldover]

Hey everyone,

I just went thorugh a 3 month grief period with my blazer, would run great and die, then was hard to start. I had a whole bunch of codes, some made no sense. I reoplaced the air filter,wires, cap, plugs, rotor as well as the ignition module checked for vacuum leaks, nothing so I took it to the local shop, where they replaced the 02 sensor, TPS sensor IAC valve. Never fixed the problem. I always thought maybe the computer was causing the problems, sometimes you woul get codes other times, it was like the computer wasnt there, turns out The computer was at fault !!!!!

I have been happy for 4 months, no problems, truck runs great, then its starts idling rough, and hesitating.
This morning I got a code 45.( rich exhaust )
I replaced the tank 2 years ago, but never replaced the fuel filter.

I was thinking of replacing the fule filter any other suggestion ?

[jackass#1]

in the manual 45 is o2 sensor indicates rich. it says to check evaporation charcoal canister and its components for the exhaust presents of fuel. replace o2 sensor.
take it for what its worth. hope it helps out.