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Old 06-10-2013, 09:00 AM   #1
Saturn_Truck
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2004 VUE 2.2L
Default P0172 after replaceing fuel pump w/P0171

I had a P0171 system too lean. Turned out to be a bad fuel pump after 100K. Cost $1.5K. So after 25miles if driving I get a P0172 and a P0496. The EVAP solenoid valve was stuck open. I replaced it, clear code. Soon the MIL came back on, but only P172 this time. So now what? Maybe a bad MAP sensor? I do have a ODBII reader for my laptop so I can read PID values as well. I noticed engine temperature is higher than usual. Calculated load SAE 0x04 maxed at 100 at some point.

2004 Saturn Vue 2.2L I4, first generation.
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Old 06-10-2013, 11:16 AM   #2
vasy
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2007 VUE Green Line
Default Re: P0172 after replaceing fuel pump w/P0171

Quote:
Originally Posted by Saturn_Truck View Post
I had a P0171 system too lean. Turned out to be a bad fuel pump after 100K. Cost $1.5K. So after 25miles if driving I get a P0172 and a P0496. The EVAP solenoid valve was stuck open. I replaced it, clear code. Soon the MIL came back on, but only P172 this time. So now what? Maybe a bad MAP sensor? I do have a ODBII reader for my laptop so I can read PID values as well. I noticed engine temperature is higher than usual. Calculated load SAE 0x04 maxed at 100 at some point.

2004 Saturn Vue 2.2L I4, first generation.
Where is The EVAP solenoid valve? I need to clean mine as I'm also getting P0496. How did you clean it?
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Old 06-10-2013, 10:26 PM   #3
Saturn_Truck
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2004 VUE 2.2L
Default Re: P0172 after replaceing fuel pump w/P0171

EVAP valve -on my vehicle, facing the engine in front the truck, on the right side of the engine camshaft cover. Its looks like a black rectangle box with a hose in the front of you and one in the back with a schrader valve port for smoke testing. The back hose goes down to the canister right by the gas tank. The hose in front goes into the intake manifold. I didn't clean mine, mostly because I can't figure out how to do that the right way. So I went to the autopart store and got a replacement for like $15. It's not difficult to replace. The old was stuck open, I was able to blow air into it and came out the other end. I compared this with the new to make sure that it is normally close. It is so mine was bad. But I still have the rich code. I think my calculated is high, 25%. I think it should be 5%. I read somewhere that this can be caused by a bad MAP sensor, cleaning it won't do the trick.

MAP is located in front of the throttle body. To get to it you must remove the air intake. A simple screw driver is needed to remove the air intake, and I think a 11mm socket for the MAP. there are three wires going to it
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