This morning engine turns over normally but will not fire/ignite - was working ok yesterday
Check the spark plugs and eventually replace them.
Check the air intake and air filter, air intake temperature sensor should be tested by a mechanic, as this can cause cold start problems.
Check if there is fuel pressure, and if fuel is circulating regularly. A tool to measure fuel pressure can be purchased at any part shop for about $30.
If fuel pressure is not regular, then check fuel pump, fuel lines , and fuel filter.
Distribution problems can also cause the car not starting at cold, check distributor rotor or coil pack, check wires to spark plugs. Try to understand if one or more cilinder is misfiring (engine rough) , in that case check distribution.
Electronic injection problems can arise because of a fault on the vacuum system, or a faulty sensor (O2 MAF) in case, do a code reading scan on the car ECU (computer module) using an ODBII code reader.
This will return error codes that can help in addressing fuel injection problem.
Also test and clean injectors.
If the problem is none of the above, check ignition and ac system, if car is not cranking, or if there is no power to sparks at all , it can be a faulty ignition (cylinder, ignition switch coil) or a problem with a locked alarm system.
As first thing replace sparks and check if they are burnt irregularly , or if one spark plug is dirtier then the others, that will mean the car is misfiring. If one spark plug is covered with oil, then one or more cylinder have problems( ring).
Replace air filter.
Replace fuel filter.
Possibly scan computer.
Try to understand if fuel is getting into cylinders and if engine has no spark, or is misfiring.
Check all wiring from ignition , coil and wiring connected to sparks.
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