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What causes a 2010 Buick Lacrosse not to start if the starter is good and the battery is new but there is no clicking of the starter when the key is turned in the ignition? The grounds are tight and connected to the starter and the battery.

Pᴀᴜʟsᴛᴇʀ2
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David Agurs
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1 Answers1

1

what causes a car not to start

To be brutally honest, a lot !

Start with turning the ignition to the on position, do you hear a hum, that means the fuel pump is good and priming, if no hum is present you need to check the fuel pump relay

Second, grab a fuel pump tester and connect it to the shader valve on the fuel injector line by the manifold, is their pressure, yes. 55psi and stable. good, now you can pinch the fuel line before the fuel pressure regulator, does fuel build up, good. The regulator is doing its job.

Third, Does the battery read 12.7 to 10.7 volts after a hour, good, Does the battery read 9.6 - 12.7 for 3 seconds while starting the car, great.

Fourth, Does the starter read 12v power to ground, good, Does the starter to solenoid still read 12v while cranking, great.

Fifth, Do you have ohms on your plug wires, any abrasions, blisters, burn marks indicating a bad wire

Sixth, is the coil pack good, any black marks, do the ohms match up. Use a 6 cyc coil pack for example, every 2, adding up to 6 should have the same ohms of resistance, I can't tell you the exact ohms because every car is different

Seventh, Crankshaft sensor, does it have ohms. Good

Eighth, PCV value, is it clogged ?

Ninth, MAF sensor do you have at least 0.1 ohms, not O.L, are you getting a voltage

Tenth, A bad coolant temperature sensor can prevent a car from starting, the ohms would rise as the temperature rises, should be around 1500 to 2000 cold

Eleventh, Alternator. If the alternator is bad it won't start the car because it can't keep the battery charged, the battery only starts up the car, the alternator keep it active.

Twelveth, spark plugs capped correctly ?

That's all I got, hope you can find your issue easier than checking everything inside of your engine :)