Question about 2000 Chevrolet Impala

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Excess gas consumtion

2003 cheve impala has excess fuel consmption & spark knock. Changed oxygen sensors & plugs, no difference. How do I remedy this situation?

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If u do alot of city drivin with short trips try putting some chevron techron in a few tanks of gas(black bottle) and im geussin u use 87 octane,try movin up to 89 octane,try that and also try clening you mass airflow sensor which is on your air intake system for the engine,be careful though..do not bend any of the small wires on the part of the sensor that is in the airflow..they are sensitive,you can buy airflow sensor cleaner at most auto parts stores,hope this helps

Posted on Sep 05, 2009

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Good day I would like to know why I burn a lot of ga I had the sparks plugs and wires changed


well, if your car is near 100,000 miles, some sensors have to be changed too, like the oxygen sensor, and temperature sensor, for best consumtion of gas.
and check the gas regulator, the presion gas must be 35 psi, if there is more than 50 psi, the regulator is bad, already.

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2001 ford windstar lx too much gas odor ,changed spark plugs & wires, replaced all 4 oxigen sensors and catalytic converter.code detected says running too lean .


You have an Intake manifold leak or a leak in the fuelpressure regulator or fuel line. Most likely you need to check the Intake gasket with a water mist or Carb cleaner spray on the seams. Either one will produce a change in the RPM while the engine is running.

Also clear your computer, which I hope you did after changing all the parts you put on the van. When you get a Vacuum leak in the Intake, the fuel is not drawn into the cylinders properly and the ECU thinks the engine is running lean. The ECU orders more gas and the fuel regulator keeps dumping more gas in the engine.

Now you smell the excess gas, but the priority sensor overrides any secondary sensor saying its rich. The Evaporative Emissions system is flooded trying to reduce the fumes. In the end, you smell the excess gas.

Now both Autozone and Oreillys do free scans and their scanner may suggest more than what your scanner is showing. Check your Intake first, then scan it.

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What would cause this vehicle to use execessive gas.


1) dirty air filter

2) vacuum leak

3) false reading from mass air flow sensor

4) false reading from coolant temperature sensor

5) improper tires inflation

6) topping off gas when fill-up (soaking emission lines with fuel)

7) Positive Crankcase Ventilation (PCV) and breather element clogging

8) Exhaust Gas Recirculation(EGR) Valve stuck with carbon and EGR passage tube is block with carbon.

9) low or dirty transmission fluid + filter (if it's an automatic)

10) excessive load

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How often do you need to change your spark plugs on a 2005 impala with 90k? They haven't been changed since I bought the car in 2006?


The average suggested time is 100,000 miles. the plugs are designed to go this long. If you check your manual it may also recommend replacing the oxygen sensors about the same time to ensure the maximun fuel economy & make sure you don't have Check engine lights coming on in the near future.

Hope this helps
Farrout.

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I would check for vacuum leaks, maybe intake or brake booster

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