My car will start but after about 15-20 minutes of driving, the car will completly turn off...i have to wait for the car to cool down for about 30 minutes before i can restart again and drive it.. If i try to restart the car, once it turns off, it takes a few, before i can get the car moving but for only a few minutes..! I can get to my job which is about 2 miles away, but if i go any further the car will shut down on me.. please help me! I just had the inspection done and it passed, someone said to put in gas treatment that may help, i did, but i dont want to take any chances...any ideas?

Radiator cooling fans not working? The ECM is protecting the engine by shutting it down.

Jim, this may be something I call VaporBlock:

Try several things:

When you've started the car (in the morning) let it idle (or drive it around the block a couple of times or so -- to get it warmed up -- I mean HOT) then turn if OFF;
and, wait 10 minutes - then try to start it...

IF it starts after the first 10 minute; then, it is NOT VaporBlock, and you'll need to drive it to a mechanic.

I this doesn't start, wait 30 (additional) minutes - then try to start it...

IF it doesn't start the after the first 10 minutes or 30 minutes; then, you may have to wait and hour -- and try it again, because you have VaporBlock.

You will have to find the "sweet-spot" of time to wait before trying to start it, or take it to a mechanic to get this issued fixed.

I used to pack my carburettor with snow to cool it down when I really needed it start again in a hurry!

I do hope this helps...

Topbarhive

1.let car sit overnight. 2. Start engine, put A/C on high, let it idle for 20-25 minutes, 2, then drive car uninterrupted for 60mph for 10 minutes, 3. slow down to 25 mph for 4 minutes, come to a complete stop with foot on brake let it idle for 2 minutes, 4. drive again at 30 mph for 8 minutes, come to a complete stop let it idle with foot on brake for 3 minutes. 4. Drive at 40 mph (turn off overdrive) for 6 minutes. 5. Drive at 20mph for 3 minutes at a time, each time coming to a complete stop with foot on brake for 2 minutes. Do this 4 times. Let the car cool overnight and repeat entire process. Then check status of systems with a code scanner.

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Sounds like your coolant level might be low. At highway speed you probably have enough coolant and with the air passing thru the radiator keeps the temp down, but at idle not so much. Or depending whether you have a belt drive or electric fan. Belt driven, could need a new belt.

Did you get fuel recently, might have something in fuel e.g water? or even the fuel filter getting clogged.

wait 10 minutes after you shut the car off - then remove the negative side of the battery - wait 30 minutes then reinstall and run the car 30 minutes.
If your cooling fluid is full and other cooling systems are in place and working - you should be fine.

The fan on your cooling system is made to continue to run once the engine is shut down if it is running a little [ or a lot] hot. So don't panic if it runs 5 minutes after you shut the car off.

a likely problem is a fuel pump going down...as it gets warm, it heats up the wiring inside and they expand causing a loss of connection inside the pump...As it cools, it comes back together and works again...when it dies out turn the key off and listen closely for the pump to hum when you turn the key on...If it doesn't wait for it to cool and then when you try again listen and if you hear it and it starts, that's your problem...fuel pumps will go bad quickly if you don't keep your tank at least a quarter to half full as the gas is what keeps it cool so it don't get too hot and melt the shellac on the wiring which will eventually short out...

possible fuel pump. Try spraying starting fluid into breather while someone is cranking engine. if vehicle tries to run it is fuel problem. If not it could be an electrical componet overheating and cooling and restarting. Coils, relays, ecm.

change the thermostat

Have you checked all fuses for the cooling fans? Seems to be that the car is warming up to temp and then some, and protecting itself from overheating by shutting down the engine.