I have an unconnected dangling vacuum hose on the drivers side. I think it is supposed to go to the purge canister. I don't see a purge canister in my truck. Would this affect the engine performance?
The canister is usually mounted on one of the inner fenders. Sometimes it is under the bed near the gas tank.
If the hose is disconnected from the canister the check engine light should be on and a code in the computer for the EVAP system.
Testimonial: "Thank you. I will look again. I never thought that it might be under the bed."
SOURCE: 2004 Pontiac Grand Prix Evaporative Canister
you should be able to fix it look for a can near the fuel tank that has vacuum hoses coming out of it and you should be able to just buy the bad solenoid
SOURCE: Service Engine and Service Vehicle lights
You can generally find a vaccum leak by pressure testing the system. Most auto parts stores sell a vaccum tester relatively cheap. Or you can take it to a shop and they will pump your sytem full of a uv sensitive die and then use a black light to find the leak. If it says vaccum leak at engine on the vent solenoid then all you need is the schematic of your vaccum system to find the solenoid and you should find your leak theoretically.
SOURCE: i need a 1987 chevy S10 vacuum hose routing diagram
Go to Autozone.com, become member, will give you repair manual,location of parts,diagrams.
SOURCE: The troubleshooting code is po440. It says the
A leak in the EVAP system can be a pain to resolve so be methodical. Start with the junction of the tube from the purge valve to the inlet manifold plenum. Disconnect this tube and block off the exposed port on the manifold. A great way for blocking off tubes and ports is to cut off the fingers of a rubber washing up glove and elastic bands to secure them over the exposed ends.
First let us recap on the system. The
EVAP system passively stores fuel vapour from the fuel tank in a charcoal filled
canister. The canister can be located on the fender or bulkhead. When the engine is running
above idle speed the ECU opens a purge valve connecting a pipe to the
throttle body. A corresponding vent valve allows the
ingress of air into the canister and this encourages fuel vapour to be drawn
out of the canister through the purge valve to the throttle air intake
mixture and thereafter to be burnt. The opening of the
purge valve cycles with engine speed.
The purge valve should be closed during idle. A faulty EVAP system manifest itself as erratic idling as it allows un-metered air into the system and compromises the inlet manifold vacuum. The blocking of the ports as initially suggested above should at least cause any erratic idling to be resolved.
The EVAP system is not critical to engine performance, it is an emission control device, so the car may be run without issue until the fault is found. Look at the fuel cap, ensure that the rubber seal is intact. To make doubly sure give it a smear of grease. Next look at the disconnected 'purge valve to throttle' tube. Inspect it thoroughly for cracks, be quite rough and twist it around to get a good look. Now locate the purge valve. If it is electrically operated simply check for voltage continuity across its connector pins. An open circuit indicates a burnt out solenoid winding. Check the connection to the canister. Check the vent valve connections, and again check its electrical continuity. Check the tank to canister tubing and any connections.
If you find no leaks you may need to take it to a garage that can do a smoke test on the system - this highlights the leaks as wisps of smoke appear where the leaks occur.
SOURCE: getting an error code of PO449 for a check engine
You are right. You need the vent valve not the purge valve. The vent valve is a dealer item. Also this is a common problem and GM has released a bulletin on this that involves moving the location of the valve and running some new lines. It comes as a kit from GM, and it costs about a 100 bucks.
DTC P0441 - Evap. Emission System Incorrect Purge Flow
Possible causes: poor/loose connection, faulty purge control solenoid valve(pcvs), faulty PCM.
Check for loose electrical connector and for loose or broke vacuum hose to it. If ok, you will need a voltmeter and vacuum gauge to test it. If fails test, replace it, if ok, then likely a faulty pcm. Most of the time it is either a bad vacuum hose to it or faulty pcsv.
With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try: Common Chrysler fix - Replace Leak Detection Pump / LDP Repair damaged EVAP lines or canister Repair open or short in voltage feed circuit to Purge Solenoid Repair open in PCM purge command circuit Replace purge Solenoid Replace vacuum switch Repair restriction in Evap line or canister or solenoid Repair resistance in purge connector Replace PCM hope helps.
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