Cranks but won't start

When the problem is ongoing, check the basics. If it cranks good but won't start, Have a helper crank it, while you visually check for spark at the plugs. If you have spark everywhere, use a gage and check fuel pressure.

If it won't even crank, check the starter circuit. I can suggest what to test, but, you have to do the testing.

It has all been tested, it's getting spark, there's fuel pressure and can hear the pump. It cranks but just doesn't catch and the odd thing is it only happens every 10 starts or so. Beginning to think it's a computer issue? Saw some other posts regarding control modules. Would really like to know what it is before I give the mechanic any more of my money. Thanks for your help!

With intermittent issues, you have to test when the problem is on going. To say somebody tested it in the past, doesn't mean anything. Even if you can hear the fuel pump, doesn't mean the pressure is good. Use a fuel pressure gage.

When the problem is ongoing, use a noid lite, check for injector pulse. When the problem is ongoing, use some starter fluid in the intake, see if the engine will try to start. I take the air-duct loose from throttle-body, open throttle valve, spray a little in, stand back from vehicle, have helper crank it. When using any flamable spray, there is a safety issue. Safety is your responsibility. Unless your willing and able to do a little testing, WHEN THE PROBLEM IS ONGOING, I'm not sure how to help?

I have the same issue but I’m getting good spark, compression, and fuel pressure . It just cranks and cranks. And it will not start. But it will start fine when it’s warm outside and it will not start when’s it’s cold outside.

Hi,

When your vehicle won't start pull a plug wire and with a spark plug tester check for spark, And if there is good spark try a know good ignition module, If there is know spark this will eliminate the secondary ignition system, And you can start doing fuel system diagnostics like checking fuel pressure and injector pulse, But This really does sound like the Passlock system failure because once it is activated it will take 10 minutes before it will start again, The passlock system is pretty tight security system, Do you know how the passlock system was disabled, Did they install a passlock bypass module or did someone measure the resistance in the ignition switch and wire in a resistor into the system, Just really curious, It really helps to back track your steps with a problem like this. I"m attaching information on checking for spark, Checking fuel pressure and how the passlock system works,

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

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

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-fuel-injection-systems-work

PASSLOCK SYSTEM
The Passlock System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock System, the Powertrain Control Module (PCM) will disable the fuel injectors causing the engine to stall immediately after starting.

The components of the Passlock System are as follows:
^ The ignition lock cylinder and key
^ The ignition lock cylinder case, including the Passlock Sensor
^ The ignition switch
^ The Body Control Module (BCM)
^ The security indicator on the instrument cluster
^ The Powertrain Control Module (PCM)
FUEL LOCKOUT CYCLE
When it receives a password which is incorrect or a password which indicates tamper and the PCM disables the fuel injectors, the fuel injectors remain disabled for 10 minutes even if the ignition switch is turned from the RUN position to the OFF position. Please let us know if this was helpful for you and if you need more information.

Thank you
Joe Terwilliger