My 99 es300 wont start, my friend checked the starter, battery, alternator and he also checked the fuel going to the motor, everything checked out to be ok. I replaced three ignition coils on the front of the motor, the car started i drove down street and it stalled again. when i tried to start it again it sounded as though it was going to start but it didn't turn over. I tried and tried until it drained my battery I swapped out the battery with another and it drained that one as well. I think I may need to change the other three ignition coils but i'm hesitant because they cost like $90 each. I'm just stuck and don't know what else to do.

Scan test engine for any codes

could be a neutral switch key switch you have to check to see if you are getting voltage to small starter wire going to your starter motor .and if you are problem could be in starter

If the car does not have a security system, I would check for voltage at the starter from the battery and from the key switch.
The power from the key switch goes thru the neutral safety switch before getting to the starter.

THE ALTERNATOR.THATS YOUR POWER.IF ALTERNATOR NOT CHARGING BATTERY.YOUR PCM - FUEL - IGNITION AND TRANSMISSION WONT HAVE ENOUGH POWER TO WORK.CAUSING CAR TO SHUT OFF.

for starting alternator wont play a role, if battery is full charged then alternator nothing to do with it,yes it could be problem with solonoied switch it come with starter motor .i t is fitted on back side of engine , near by gearbox.

was the battery charged prior to replacing alt if it wasn't battery possible still to low/weak to start vehicle alt charges battery and also runs accessories / battery starts vehicle if it wasnt charged vehicle wont start if battery is charged check conections for loose or damaged

Look into the starter motor.

Car is 10 years old and starter motor problem is linked to startup issues in cars. Common issue

I can only say that for the old cars even sitting for a year is not healthy, because most parts of engine, starting system, charging system will get corroded/deposited. Most probably you will need to change battery, motor oil, fuel, spark plugs, check the starter and alternator. Also check the fuel pump, fuel filter. First shot would be battery, fuel, spark plugs and starter.
Good Luck

I had a similar experience just the other day, i stopped to get gas and turned the car off and when attempting to turn the car back on nothing would happen. Well, let me rephrase the lights inside and out would work as well as the ac and the radio. My initial train of thought was maybe it was the battery so i went and purchased a new battery which was around $100, I installed the new battery and the car still wouldn't start. Does your car make a clicking noise when you turn the inginition key or is it just silent? If it is silent, you might want to check to see if your starter has burned out. Luckly a friend of a friend does his own mechanical work and was able to remove and replace the starter for me. After the starter was replaced the car started right up and ran perfectly. Not sure where u live but in my area a starter ranges in price from $100-200, but they also charge a core fee ranging from $45+, which can be reimbursed if you bring in your old starter to the store. I would suggest getting a starter with a lifetime warranty as well, but thats just a suggestion.

Hope this helps,

brelic

can be a lot of reasons 1.battery 2.oil level 3.timing belt 4.starter motor most of cars are having problem of starter motor nd you can check it if fuel pump is working or not take of the outlet fuel pipe and try to start it if fuel is coming means is ok if not then it means fuel pump