My 2008 impala was fine until the winter it idles in and out at times and cut off twice in the last 3weeks and my dash board lights and head lights get dim and then bright in and out
Clean throttle body,change air filter,fuel filter,put some fuel cleaner.
SOURCE: 2002 Chevrolet Impala overheating while idling
the thermostates on the 3400 engines are late because the fans kick in at the last moment. if you run your ac on you will notice that the gauge stays in front of the half mark or right on the half mark. that is because when you turn on your ac your fans will kick in earlier and stay on the whole time the ac is on. if you run your car with the heat on or nothing on that leaves the late thermostate to kick in verus you turning on your ac and it by passes the thermostates and runs the fans once the engine gets at at lest 120 deg. i use to have a 2002 and i had the same problem. this will keep your engine cooler. also if you don't want your air on just turn on your windshield defrosters (not the back windshield) and that helps keep your engine cool because your defrosters use your air compressor which is really your ac. so it still kicks the fans on earlier.
SOURCE: 2003 Chevy Impala - radio, instrument
There are two possible cause of dim display.
On the deluxe trim level of the Impala the is light sensor. When the sensor mis-calibrated the light will not be at the level you want.
As a test,use a small flash light and aim to the sensor and see is the circuit act according it.
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The dimmer light is a VERY CHEAP component. I will glow it out with compress air 1st. Turn the dial back and forth 20-30 time in rapid motion will help remove unwanted carbon,
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Use a eletrical contact cleaner to clean all contacts.
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Is the headlight in OEM specification?
After market headlights may draw more amperage and cause low power for smaller bulbs.
SOURCE: 1990 full size blazer starts fine idles then dies
sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know
SOURCE: Battery died, gauge cluster bulbs on dimly, now rough idle result
How much have you driven vehicle? You need to drive long enough for computer to reset refrence points onboard. If that does not work, you have a bad voltage limiter on your instrument cluster board!
SOURCE: My 2004 chevy impala has
Do you have a check engine light on and what are the codes if any? Your symptoms describe 4 things I have seen go bad on this car. A bad cat converter can cause this. A bas fuel pressure regulator can cause this. Pull vacum hose of fuel pressure regulator and inspect for liquid fuel. If there is any than the part needs replaced. A bad mas air flow sensor can also create this problem. A weak fuel pump can also cause this.
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