engine cranks but not starting?

Car was driving good no problems or noise. It just would not start one day. Not the battery or the starter.

Hello,

It maybe fuel or spark related. Please run some tests to see which problem you have.

https://www.2carpros.com/articles/how-to-test-engine-compression

and

https://www.2carpros.com/articles/how-to-test-an-ignition-system

and

https://www.2carpros.com/articles/car-cranks-but-wont-start


Please run some tests and get back to us so we can continue helping you.

Cheers, Ken

my daughter's car finally quit on her, she has a 1999 mercury cougar, manual trans, somedays the car will cut off as she is driving down the road, she pulls over, wait for few minutes and the car will start, but few weeks ago, it has refused to start. a friend told us that it could be the computer.

check for spark and suspect crank sensor



The ignition system consists of an ignition coil, spark plug wires and spark plugs.

The crankshaft position sensor signal is the basis for ignition timing calculations. The alternating voltage signal from the crankshaft position sensor is digitized by a pulse former within the powertrain control module. This digitized signal is then used to position the closing time of the primary circuit of the ignition coil.

Ignition timing is determined by the powertrain control module in response to engine operating conditions based on stored data tables or maps. Once ignition timing has been determined, the powertrain control module interrupts the current to the primary circuit of the ignition coil thus triggering the ignition spark. This spark is supplied to the cylinders through the spark plug wires and spark plugs.

The ignition coils are triggered by the powertrain control module in pairs (cylinders 1 and 5, cylinders 4 and 3 and cylinders 2 and 6) sending one ignition spark to the firing cylinder and one ignition spark to the corresponding cylinder on the exhaust stroke.

replaced fuel pump alternator battery and spark, plugs good fuel pressure in the fuel rail. cars getting spark engine and cranking fine so starter is good but the car still wont run

fuel, spark and compression are required to start. one of them is missing. you say you have spark. good, now you need to measure the fuel pressure. should be around 40+ lbs.

Roy

have all 3 of those the car still doesnt start that is the problem

maybe it is flooded. what is the compression and fuel pressure

Roy

its almost as though there is fuel through the rail the injectors arent opening

almost?? you need to measure the fuel pressure. try sparying carb cleaner into the air filter and see if the motor fires up for a few seconds.

Roy

already did with starter fluid

and??? did it start

yes

ok, i bet you have a failed fuel pump. it may not have enough pressure to start it.

check the inertia switch as well. it may be in the trunk behind a door clearly marked or it is behind the right front kick panel in front of the passenger door.

Roy

have fuel pressure up to 40 psi but having an issue where i have to pump it up by turning the key on and off or wiggeling the relay so the pump goes on and off also was wondering what the five wires are on the plug for the pump boot

I replaced the alternator now the car won't start. All wires are connected and the battery is good but the car has no spark at the plugs.

Try checking the crankshaft position sensor connector if its loose or disconnected-start here

The crankshaft sensor is pluged in and wires are good also the check engine light does turn off when cranking and the security light goes out when the ignition is on.

You need to backtrack everything you have touched while removing the alternator if it was running before you replace the alternator