Quote:
Originally Posted by Aboonah
We have a 2005 Z71 Suburban for two years. From the time we got it, it has been very slow to refuel: 1/10 gal in 3-seconds is about the fastest it will take fuel without the nozzle shutting off.
I finally got tired of standing there in 100-degree heat of summer and current 0-degree cold - and took it to a local shop.
They removed the roll-over valve, saying it was defective. Maybe it was, but removing it did not make any improvement in the problem.
I took it to AutoZone to read the codes and got four codes back: PO455 (Large Evap Leak Detected), PO430 (Catalyst Efficiency Low-bank 2), PO420 (Catalyst Efficiency Low-bank 1) and PO140 (Heated Oxygen Sensor)
Can anyone put this together?
TIA
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you do have a lot of problems with this vehicle. p0455 is the pressure sender is not working. this is in the fuel tank. the p0420/430 is saying that the cat converters both are not working properly [could be bad] the p0140 is the driver side downstream O2 sensor not properly switching voltage. when the engine is running the sensor voltage swings up and down at a rate that the PCM is expecting due to the programing of the computer , so this is not being generated as expected. The fuel fill is because the vent valve is stuck closed or the charcoal canister and venting lines are plugged up from over filling the fuel tank.
there is no roll over valve that I know of . I hope they did not screw you over with this part.
the fuel tank is a sealed unit if you roll it the fuel stays in the tank.
if there is such a valve I would be very interested also the part number .