2002 Saturn L300 2002 L300 Won't Restart When Warm

2002 SATURN L300
33,000 MILES • 6 CYL • FWD • AUTOMATIC
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DUFFYEVES
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2002 L300 - Car won't restart after being driven very short distances ( <3 Miles). Have read codes and scanned real time - only error ever found is PO128
low coolant temp ( Stat is located under Intake Manifold and is rated at 6.0 hours to replace - beleive stat to be stuck open as heat is minimal in winter.

All gages icluding temperature are working fine.

Once car starts it runs perfectly - left it on for 1.5 hours and A/C On at +90F - Drove at 75 MPH. After that. It would start

Am wondering if it is the front heated oxygen senson
Front= by radiator = Cylinder 2-4-6. And sensor is thinking that engine is cold and pumping extra gas as thinks that it needs to make mixture richer.

Again - nothing from ECU Computer indicating fault
even says both pre catalytic sensors are opeating OK

Help ! this is driving me ( WELL SOMETIMES DRIVING ME CRAZY!)
Aug 9, 2008 at 7:50 AM
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