SOURCE: 2000 saturn want start after driving for a while
Saturn has had a problem with bad
crank position sensors which are fairly cheap and easy enough to replace. (about $20 or less)
When the sensor gets hot, it won't work, so after cooling down it will work again. If you test it, it must be tested when hot otherwise it will test fine, please let me know if you have any more questions and I would be glad to help.
good luck
SOURCE: 1996 Saturn SL2 car won't restart after running
engine coolant temp. sensor is cracked pull it out it is on the side of the head.. easy fix you will see its cracked when you pull it 15 dollar fix
SOURCE: overheating 1996 saturn sl2
Check your oil while warm. If it looks like chocolate milk, you have coolant in your oil. If your vehicle is cold, undo the oil drain plug and see if you have coolant coming out of the oil pan. You can also rent a Block Tester at Autozone for $25.00 (you get the 25.00 back when you return it) and buy some block test fluid ($8.99). You get a lot of fluid and will be able to check multiple times. Pour the test fluid into the tester to the line and take off your radiator cap. Run your car until it's at the high side of normal and put the tester into your radiator filler neck. Depress the aspirator bulb over and over for two minutes and see if the blue fluid turns green or yellow. If it does, you have combustion/emission gases in the coolant and therefore a cracked/warped block/head or a bad head gasket. If it turns green or yellow, disconnect one head's spark plug wires and re-test. If you have the same happen, you have a problem with that head. Check the other too.
SOURCE: 98 Saturn SL2 - Stalling issues
I had a problem with starts on my 98 sc2, did it twice only, but it would start up, shake a bit then shut down like it wasn't getting fuel, or a wrong mixture. Replaced the coolant temperature sensor and starts / idles like new now... goodluck
SOURCE: 2000 Saturn SL2 runs fine
reasearch "intake manifold gasket". i have the same car, and the same problem, and everything ive read so far points to the intake manifold gasket. apparently during production there was an error that caused the original gaskets to crease. i would suggest taking some brake or carb cleaner and spraying it around intake #1 while the car is idling in park, this should cause the engine to idle rougher. if it does the gasket is your problem.
here's a link to another thread that sheds a lot of light on the issue, and even has some instructions on how to repair.
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