I have a 1999 e320 that runs fine when its cool but when it has been driven for about an hour and warm up real good it cuts off and wont start again until it cool off....... Can someone please help me

Do you have it in N -neutral?

97 E320 Engine Won't Start - MBWorld.org Forums

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May 15, 2009 - Hello ladies and gents, I bought a 97 E320 on February with 82k miles on it. ... hours I got out of work and try to start the car, it cranks but the engine justwon't start running. ... Drives: 1997 s320, 1997 e320 ... Cognomen is in homage to the late great Janis Joplin "Oh lord won't you buy me a Mercedes Benz". 2003 E320 cranks but won't start...
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1997 E320 Wont Start - PeachParts Mercedes ShopForum

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A lot of the time when that happens it is crank sensor it starts to get hot and stuffs up how I check and it work sometimes is poor cold water all around the sensor area after it stops and if she starts up after you cooled it down you found the problem then just replace it

Which engine, 2.7L?? Is it full of coolant?? If the water pump has failed, it a pretty expensive repair.

Sounds like the solenoid................it gets overheated, when it cools off it'll start and run again, get heated again, shutdown.

Either a weak battery or a defective starter. Have you checked your battery voltage when it will not crank? Cleaned your battery terminals?

If you need further help, reach me via phone at https://www.6ya.com/expert/tom_1788908372a4836f

replace engine coolant temp sensor

if you unlplugged the temp sensor so the fans will run the cars computer cant read engine temp and will call for to much fuel which will run good when cold but bad when warmed up

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

You have a bad starter. A faulty starter will function when its cold but when it heats up, it takes more energy to get the starter to engage. Your problem is exhibiting the classic symptoms of a bad starter. I hope this solves your problem and the best of luck to you.

Had the same problem with 1999 Quest - turns out that the distributor was going until it finally died. It stuttered andf kept shutting off when driven about 20 miles or so. Would start normally when cooled and off again when hot. But yours could be a different problem; not sure.

This is a symptom of a bad coil. The car will generally idle well, and performance will deteriorate when the car (and the coil pack)warms up.