Won t start

Need to check if your getting spark in the cylinder.

Check the crank case sensor

Try check the engine control unit.. It's located at passenger side under the plastic cover food step side wall.. I repair more then 30 units of this GS300 n ARISTO all with the ECU failure if check everything with the engine n sensor.. Also check if there is fuel supply coz some model build with hi-low fuelpump control module.

So then the next questions are - - do you have spark to the plugs and power and pulse ground to the injectors ?

For some reason aleros have this problem every once in awhile. It might be the security on the alero. What you would have to do is turn the key all the way to accel i believe right before you start it and let it sit for about 13 minutes. affter this the security will recognise itself and start your car

U might have 12 volts but no cranking amps try a jump start

ck fuel pressure at pressure test port first.

CHECK COIL PACK OR FUEL PUMP

Ignition relay or fuse could be the problem. When you turn the key to start do you hear a fuel pump kicking on and or do you have spark when you hot wire the starter (I know it's hard to check while trying to start it)? You can email me back and I might be able to pinpoint it more.

Cold start injector, possibly
Dirty fuel filter or failing fuel pump
Intermittent faulty fuel pump relay