ETC light is on, engine has problems starting.

you need to get the OBD codes read , this will guide you to the problem area by giving a code(s) , post these codes and will , hopefully, be able to help further.The OBD can be read by any competant mechanic with the correct instrumentation etc.

Try starting with the light on and see what she do, if the light dims substantially when you crank the engine, start by recharging the battery. More information please.

please test this.God bless you

When you turn the ignition ON before starting the car, the "Check engine" light is supposed to come on indicating that the engine computer (also could be called ECM, PCM, or ECU) is powered on. If the "Check engine" light does not come with the ignition ON, it's possible that there is no power coming to the engine computer (e.g., due to a broken wire, faulty main relay, burnt fuse, etc.) or that there is a problem with the engine computer itself.

Make sure all the ends on your battery cables are clean and tight. I got a tow in because my car would not try to start even tried boosting to no avail. All my lights and radio was working but they said the cable was corroded and would not let the full power work. We replaced the battery cables and worked like new now.

The type of oil in the engine will not affect the check engine light. The engine light only comes on when something in the engine management system is out of specifications. Any sensor reading out of specification, e.g. oxygen sensor, mass air flow sensor, throttle position sensor etc., will trip the engine light. The only way I can think that the oil changers could be responsible is if they moved or damaged some wiring or a sensor etc. while doing the oil change.

Check engine light WILL reveal all - any good parts store can do an OBII scan for you and most like Autozone,Advance, etc... will do it free. Who knows how long previous owner drove w/light on - and a general rule of thumb - "longer the light is on, the bigger the problem gets".

Did the engine turn over or not ,,if yes then you
could have something like no spark. no fuel pressure .no compression.etc etc .
If the engine did not turn over but just made a clicking noise then you have a problem like FLAT
Battery or starter motor problem .or feed wire broken
so turn on head lights and turn key if lights go out the battery is flat or dead/if lights stay on starter u/s

The problem you describe has many possible causes (usually an EMS (Engine Management System) sensor and/or circuit) which are most difficult to diagnose without a Check Engine light coming ON. Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we
can go from there. If the Check Engine light didn't come ON at any time, this becomes guess work & that can get expensive... suspected part after part after part. Since you mentioned the problem doesn't occur until the vehicle sits overnight, I suspect a sensor is starting to malfunction when it cools down, or connections to the fuel pump, crank position sensor going bad, oxidation of electrical wiring/connectors/pins, etc, etc. Sometimes simply disconnecting a component and reconnecting it solves the problem - difficult to impossible to say with any accuracy/certainty.

Most auto parts stores Advance/ Autozone etc will get the diagnostics codes from cars computer and tell you why the light is on and what the problem is if there is a problem.

change the pcv valve its under the intake manifold