I have a 01 2.4 alaro with 130k code 440. new cap and purge valve. I also checked vacuum at throttle body,there seems to be none or very little.need a piece of paper towel it holds it there. reset code two or three days later light is back. also it idle is 600 rpm,s in gear cleaned throttle body to see if there is a restriction.
Country: United StatesMake: OldsmobileModel: AleroYear: 2001Engine: 2.4
replaced cap (oem all parts)purge valve
Hi,welcome to Just Answer.I will be happy to assist you with this question today.I will try and assist you as best as possible from here,feel free to ask any follow up questions to my info provided here.This code will set when a large leak has been detected in the evap fuel tank emissions system.This can be anything from a loose or incorrect gas cap,a hose or pipe leaking that sends vapors from the tank to the engine,the canister leaking or possibly even the evap vent valve stuck open.What needs to be done from here is to have an evap test done to locate which component is at fault.A shop or dealer has a smoke machine they can use to inject smoke into the evap system and a scan tool to shut off the evap vent valve.Any smoke leaking out is the source of the leak that needs corrected.Most common can be the vent valve at fault or a leaking hose/pipe causing the fault.In some cases you can trace and check the hoses/pipes to see if the leak can be located and then repaired.In others you may need to have the smoke test done to locate the leak.Let me know if you need anything else and positive ratings are appreciated.Thanks Pete.
15 years Oldsmobile training and experience.
As I said earlier replace cap and purge valve, there seems to be no vacuum at the thorttle body when I remove hose?
The 2.4 liter didn't put out allot of vacuum for the evap system as this is how it was designed and the code you have set is for a large leak meaning the evap emissions system has detected vacuum leaking in the fuel tank itself or the evap lines.The system does need tested properly to locate what component for sure is leaking and then that component can be replaced or repaired to correct the fault.Let me know if you need anything else and positive ratings are appreciated.Thanks Pete.
Is this also the reason for the 600 rpm idle? or is this normal?
I believe this is normal idle for this vehicle here,if the idle was to low or to high the computer would detect this and set an idle fault code as well as the computer knows what the idle should be and compares it to what it actually is so if it were way off it sets a fault code.
Hi,I'm just following up with you to see how everything is going. Did my answer help?Let me know,Pete
I HAVE NO VACUUM AT THROTTLE BODY? FOR THE EVAC LINE SO HOW CAN I HAVE A LEAK?
Have you checked for carbon build up in the throttle body?
sprayed with carb cleaner,removed the idle solenoid cleaned nominal carbon. other vacuum lines have vacuum.????
O.k.,I apologize as I will have to opt out of this question and put it back on the list to see if any other experts can assist better on this.If someone can they should be with you shortly.Don't reply to me unless it is a last resort as it will keep the question locked to me.Thanks Pete.
hello, my name is XXXXX XXXXX X will try to help you .
you need to check the operation of the purge valve and the canister vent valve
the purge valve is under the hood and the vent valve is near the canister under the car
there are a few ways to check these
1 .using a scanner you can activate the valves
2. you can check for battery voltage on the valves
the pcm actually activates the valves using the ground circuit to them .
there should be battery voltage to each valve with the key in the on position.
the ground circuit will activate under certain conditions such as after siitng overnight or driving down the road to purge the fuel vapors .
you can check the wiring and make sure you have battery voltage anf look for corroded terminals or even broken wiring at the connector of the vent valve .
being underneath the car the vent valve(not the purge valve).
remove the vent valve (canister valve)under the car and put a bettery source to one of the terminals (it really doesnt matter which terminal as this is a solenoid and will work both ways)
touch a ground source to the other terminal ,as you touch it to the ground terminal it should click .
The best way is to hook it up to a smoke machine and a scanner and activate the vent valve(canister valve()solenoid)and see if it is working and sealing .
this also can be done for the purge valve under the hood .
a po440 means a large evap leak and most times it will be the vent valve under the car ,due to a bad valve/wiring issues /corroded wirng or broken wiring
I HAVE REPLACED THE PURGE VALVE,GAS CAP WITH OEM PARTS. THE IS NO VACUUM AT THE THROTTLE BODY TO SUPPLY VACUUM TO THE SYSTEM. I CLEANED THE BODY WITH CARB CLEANER. VERY LITTLE CARBON. I DO GET VACUUM FROM ADJACENT LINES?
The throttle body does not have a strong vacuum for the evap nor does of need it Also the vent valve is near the vent canister under the car Which valve did you replace the one under the hood or the one under the car. Did anyone do a smoke test or use a scanner tosee if you can activate both valves. Purge and vent valves
Under the car. no not yet. I guess its the dealer next.
Well you don't really have to go to a dealer maybe a shop and see if they have the right equiptment to diagnosis and fix it or they can diagnosis and you can buy the parts and fix it yourself usually with that code it is the vent valve under the car either the valve goes bad or the wiring at the connector is corroded or broken look for the canister for the evap and inspect the wiring and hoses if that looks good then most likely the Valve is bad
It turned out to be the fuel pump. Replaced it no check engine lite was thesensor on the tank. But Thank You for asking