SOURCE: I have a 2004 Avalanche, 49K mileage, code PO446,
That is an EVAP code. its a vent control code. you can manually test it by powering it up if you know where its at. i cant remember exaclty where its at off the top of my head but its only 2 wires. using a volt meter you want to make sure power is getting to it, but you cannot activate it without dealer scan tool.hmmm if you can figure out which is ground and power when you give it 12 volts it should click. meaning your vent solenoid works and you have wiring problems or its leaking.
EVAP problems are hard to finde with out scanners. you can change the vent solenoid and hope it fixes it. but a code points you to the direction of a problem. hopefull its not wiring problems. in the northern states with snow. ice can pull out wires and also get clogged in the vent solenoid and lock it up. its either wiring or bad or a leaking solenoid. check condition of wires. if they look good try a vent soleniod.
if that doesnt fix it after a engine light reset and 2 weeks or so. then goto dealer. you need to reset it after repair. light will not go off on its own.GOOD LUCK
Michael
ASE certified.
plz rate
SOURCE: 1998 Chevy s10 emission leak. Replaced gas cap and
This could be something as simple as a broken vacuum line. What were the codes that were retrieved from the system? Let me know and I will help you rack this down.
SOURCE: diagram for where the canister
3.8 liter - remove the engine cover. As your standing in front of the vehicle it will be located on the passenger side of the engine inbetween the intake plenum and the valve cover. It will have three wires going to it and to vacuum hoses.
3.4 liter - it will be either mounted to the intake plenum in between the throttle body and the EGR valve. It could also be mounted to the coil/module bracket on the backside of the motor in betweent the motor and the firewall. I think its new enough that it should be in the first location I described.
Also on the under side of the hood (if its the original hood) there should be a sticker with a vacuum diagram and the basic location of that solenoid. The sticker could also be mounted on the upper radiator support or the strut tower on the passenger side.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
SOURCE: 2004 Chevy Cavalier 2.2 eco Automatic 94,000 miles
in my experience the usual culprit is the evap cannister. the problem is it gets moisture in it and freezes during winter thus cracking the plastic. if you lay under the car and look at the evap box it black plastic and if you see a loose or cracked hose or the box itself is cracked that is most likely it. as a side note you can check the gas cap and buy a new one to see if that rectifies the situation. lastly i don't think the gas tank should be suspect as you would probably notice if gas was leaking out of the tank. if you take the car to a dealer or shop they can do a smoke test and determine where the leak is.
SOURCE: insufficient egr flow, already replaced egr valve
I too replaced the egr valve and was discouraged that the check engine light came back on with the same "insufficient flow" code. I took it to my mechanic to put it on the monster diagnostic machine. It said "check all vacuum line, and or map sensor". After looking real close we found a melted vacuum tube, and a cracked vacuum angle connector. Replaced both vacuum pieces, reset the codes, and good to go. If that fails than the next thing is the map sensor, that tells the EGR valve what to do.
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