04 Impala


Asked by Nov 18, 2016 at 08:16 PM about the 2004 Chevrolet Impala LS

Question type: Maintenance & Repair

So my 04 Impala drives great on highways
and when in town at a stop it just dies.starts
right back up fine .Not overheating or
leaking whatsoever. It's misfiring
somewhere. Next question I have no heat
whatsoever what do I need .was told alot of
different answers n im confused n

4 Answers


This is my diagnostic test

3 people found this helpful.

Looks like you may need an EGR valve and a thermostat. The "ECT (Engine Coolant Temperature) sensor below thermostat regulating temperature" is usually caused by a stuck open thermostat. The fact that you have no heat confirms that. You get heat from the heater core which has hot coolant flowing through it. Your thermostat keeps the engine coolant at a minimum of 195°F once the engine is warmed up. There's a time limit for the engine to reach normal operating temperature (195°F). Usually 7 to 9 minutes after a cold start up. If the thermostat is stuck open the engine won't reach operating temperature, especially in the colder weather. I believe the EGR valve is causing the P0300 misfire code and the stalling. If the EGR valve is not working properly it will cause low speed misfiring, hard/no starting, and stalling. You may just need to remove and clean the EGR valve and EGR tubes. Oh, EGR stands for Exhaust Gas Recirculation. The valve and tubes often get clogged up with carbon deposits from the exhaust gases flowing through there. HTH. -Jim

4 people found this helpful.

EGR and can I you tell me how much that usually costs please

3 people found this helpful.

Just looked it up. I work for NAPA. Cheapest one through us is $139. Plus figure about 1 hour of labor if you're not doing it yourself. HTH. -Jim

4 people found this helpful.

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