Good Afternoon all! I am in need of some advice regarding my daughter's 2004 Chevy Aveo. The car is experiencing an intermittent hesitation upon acceleration. I was finally able to recreate the problem after a franchised auto repair shop failed to correctly diagnose the problem. Their attempt at a solution was to charge me over $400 for a set of ignition wires and spark plugs. This of course failed to correct the problem. :confused:
My daughter noted that the problem most often occurs when the car is cold and turning left. Also, the check engine light is illuminated. The Auto Zone scanner displays code # P2422, PCM detected the evaporative emission system vent vacuum. After replacing the fuel cap, the codes were cleared but within 48 hours the light is on again. :dontknow:
I am taking it to have the code read again but I am hoping someone has experienced a similar problem. Any help is greatly appreciated.
**********************************UPDATE********** ****************************
After a second scan, the scanner displays the code # P0455: The ECM has detected a large leak in the EVAP system during a system monitor test.
Possible Causes:
1. Defective, loose, or missing fuel cap
2. EVAP canister broke, hose cracked or not connected
3. Purge or vent solenoid defective
4. Vacuum leak at engine
In addition, my daughter informed me of a thump sound similar to that of a heavy item falling inside the trunk area. Initially I discounted this as a symptom of the brake problem I repaired. After hearing the same sound post brake job, I assumed it was a result of something done wrong. However, I asked if the sound occurred when the car is stationary which in fact it does occur when stopped and when moving. Therefore, I am going to trace all vacuum lines from the fuel tank/charcoal canister forward to the engine compartment. Again, any advice, tips, personal experiences are welcomed and greatly appreciated.