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2005 jeep liberty has an engine light (yellow)staying on checked it out and checked fuel cap it is tight... now I have a knock or tick in the top of the engine... any help?
Re: 2005 jeep liberty has an engine light (yellow)staying...
Oil check oil. when light on dash comes on that means your jeep has a code for ya. take to auto zone and they will read the code for free with a code reader.
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Did you try loosening the gas cap? If it behaves differently, never mind the engine light for the moment, but does the performance improve any? If so, replace the gas cap or make certain it is tight after fueling. Let us know if this helps or fixes the issue.
Hi Katherine: P0456 - Evaporative Emissions System - Small leak detected The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the fuel tank pressure (FTP) sensor. When the sensor indicates a small leak in the EVAP system, this code is set.
Potential Symptoms: there will likely be no noticeable symptoms other than the Malfunction Indicator Lamp (MIL). This is because the EVAP system is a closed system and only controls fuel tank vapors, not engine management.
Causes: Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause: A small leak in any of the EVAP hoses or fuel tank hoses A small leak in the purge valve or vent valve The EVAP Canister may be leaking
Possible Solutions: first, using a scan tool activate the vent solenoid, sealing the system. Then monitor the fuel tank pressure (FTP) sensor. If the system is sealing properly, the number will stay consistent. If is isn't, the pressure sensor will show that as well. If the system slowly leaks, use a smoke machine and watch for smoke exiting the system at any EVAP component. Any where there is smoke exiting the system, that is the faulty component. Do not pressurize the EVAP system with air pressure. Doing so can damage the purge and vent solenoids in the system.
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first, though you mentioned no oil leaking, is there oil in the engine? Next, if engine runs well and is not ticking or tapping, have the codes checked...most larger parts stores do this free. Once you have the stored codes you can look up what system is malfunctioning. If engine is making any noise at all or there is no oil in it, DO NOT START OR DRIVE IT...make sure whoever did the oil change knows about this now...If someone forgot to put oil in, they may be buying you a new engine! At this point it may be something simple but can also be very serious.(hope not) good luck
what code was causing the lite to come on?
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