For the original question, we had the same issue with a Saturn L100 - the fix was installing a new BCM - (Body Control Module).
SOURCE: 2002 Saturn SC1 - Starts fine and runs well until
Most Likely Coolant temp sensor & connector.Located in cyclinder head under upper radiatior hose.Two wires to connector yellow & black.Replacement sensor is brass (from saturn) Original is ceramic & cracks cause poor performance,stalling,idle issues.Also check plugs & wires for carbon tracking.Replace plugs & wires as a set all at once.Hope this helps
SOURCE: When I come to a stop, the car dies. After idling
Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: saturn starts but will not keep an idle and dies
Sounds like you are pretty knowledgeable with the maintenance. With that said do you know if the Engine Coolant Temperature Sensor (ECTS) has been replaced? I'd put that at the TOP of the list of parts to replace next. If it hasn't been replaced it is the cause of a lot of problems.
The factory one is plastic and cracks. When it cracks it sends the PCM a signal that the engine is -40F below zero. The PCM will compensate by dumping A LOT of fuel into the engine to try and warm it up. It will cause all kinds of starting and idling problems.
Autozone or the dealer sells the better brass tipped one. The ECTS is located just under and behind the upper radiator hose. You'll need to remove the air intake tubing to see it or get to it. It has two wires going to it and goes into a connector. Squeeze the connector at the "ears" and it will come off. A 10MM DEEP well socket will take it out. Swap it quickly because some coolant will come out (a couple of ounces). Hand tighten it and snug it with the socket (not too much because it will strip out). Connector back on (either direction it's non polar). Put the intake back on and enjoy better starting and idling.
Testimonial: "thank you very much. youve been most helpful and i will let you know how it works out for me as soon as i replace the ects"
SOURCE: Where is the fuel filter on a 2004 saturn vue
It is part of the fuel pump module inside the fuel tank, all the cars are starting to use this type of setup, the filter is only serviced when the fuel pump fails.
SOURCE: 2002 saturn l100 A/C wont work
ok ac system has a pressure switch that stops the compressor when freon is too low. they actually say it is ok for mobile a/c systems to lose a half pound a year. most a/c systems run on under 2 pounds of freon. so after 3 or 4 years some systems will just quit working. you are at 8 to 9 years so i would recommend you find an independant shop that will top off your a/c and see if it works again. this should not cost more that 50 to 75 bucks. If you were here that is what i would charge. I am in columbus ohio just to let you know. hope this helps and thanks for using fixya
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