I had that code shortly after we bought the 2003 Blazer and it turned out to be a bad purge solenoid. And bbengineer is right it will kill your MPG. And if the purge canister gets damaged you could get raw fuel in the canister. And you don''t want that. ''82 K-5 Blazer did that. Vehicle ran like s**t and blew black smoke.
_________________ Wasting Away Again in Margaritaville
Fan of Trans Siberian Orchestra
I'm throwing the ol' P0440. I was filling up at a VERY slow pump the other day, so slow that the valve didn't shut itself and gas started spewing out of the tank. I have a feeling that might be the culprit. Dang you, Pilot Travel Centers!
It's easy enough to access, I only know it';s there because I saw it while doing some other work back there and looked up. as long as you put the rear of the car up on ramps or on jack stands, you should have no problem finding it or servicing it.
Plus you can't remove the rear "fenders" , which are actually rear quarter panels.
_________________ If it doesn't fit, force it. If it breaks, then it needed to be replaced anyways.
whitelightnin04MC -"...sex is sex, no matter what orifice is involved or whose sheep it was."
Guy at autozone today told me that after replacing the gas cap, even if you clear the code, it could take up to 50 cycles for the diagnostics to realize the problem is fixed (if that's all I needed) and that I should just keep clearing the code when it comes up for at least a month. That sounded downright ridiculous to me, so I went to Murray's, and they suggested that code P0440 was my O2 sensor...again, WTF?
Regardless, along with my P0440, P0420 (cat efficiency), as of two days ago, has started to pop up. Guy at autozone said that 0440 describes a big evap system leak and 0420 describes a small evap leak. Once again, I don't think that's right. I thought 0420 was just for the rear O2 sensor, which I have simulated, so I'm thinking my simulator might be bad. I got it from ZZP, so I"m going to call them up and ask.
In the meantime, should I really be waiting for 50 drive cycles or was that guy just a moron and I should try the solenoid/look for leaks in vacuum lines next? How many lines are involved in the evap system? Only the ones back by the gas tank? Some under the engine bay? As always, the help is much appreciated.
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