Just a loose vacuum line can cause a problem. What I have done in the past is cut just the tip of each rubber vacuum line(that is if there is enough) to reassure the line has a tight fit on the fitting. I don't know if this was any help or not ?
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The computer has detected an emission leak when it runs a self test during start up and the drive cycle. One of the most common problems is people forgetting to reinstall/tighten the fuel cap. The manufacturer introduced this light so it will be the first thing checked by the owner before spending money and heading to a shop. There are numerous reasons for this light other than the fuel cap. You may have a problem with a disconnected /leaking evap hose.. purge valve..pressure sensor... charcoal canister etc. The emission system will need to be scanned to isolate the source of the failure
Did the garage check the gas cap during the emission test? 90% of the time an evap leak turns out to be a bad gas cap. Or if someone had gas cap off while engine was running (pumping gas). Or if gas cap was not tightened all the way while driving. If this is the case, code saying evap leak, will clear after drive cycle self tests are done. Usually after 50 miles or more.(if the leak is solved)
Have same problem with my 2002 Silverado. Changed purge valve. Still no luck. There is a fitting for forcing smoke into fuel system to find leaks. I checked out a friends Trailblazer (same code) Someone stole his gas cap. Bad gas cap can also cause this code. You can ignore this code. It does not have any effect on engine performance, but if you have to pass emision test must be repaired
The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the yellow Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.
This code will not stall or no start of your engine, evap only work when engine is off, it is to reduce the fume your gas tank lets out to protect the o zone, but it will not pass Emission test, also could be some thing a small as your gas cap not sealing right.
Finding a leak in these emission systems is almost impossible.
All it takes is a pin hole in a hose to screw up the whole system.
The best way to find the leak is to take and have a smoke test done on it. Smoke is injected into the system and where ever the leak is , the smoke will leak out of it. It's faster and more reliable then replacing hoses and other things you don't need. Call dealers, or repair shops to see who does smoke tests.
P0442=Evaporative Emission System Leak Detected (small leak) P0449=Evaporative Emission System Vent Valve/Solenoid Circuit The first reason this would show up on a car as new is yours would be someone is not turning the gas cap at least three clicks past tight.The computer runs random vacume checks on the breather line to the fuel tank,if the cap is not tight it can't create vacume.and will fail the test.The second would be a cap replacement,The third would be a purge valve or line leaking.
P0135 is a bad 02 sensor
P0442 is a evap problem
P0449 is a vent solenoid
i would check the vent solenoid first its a 4ws fuse under the hood in the fuse box make sure you have power to it you should have power at all times the ground comes from the pcm i think if you fix this everything else will work they are all computer controled