Burning alot of fuel 2001 chevy impala 3.4 engine. Check engine light on. recent tune up. 95,000 miles. Car also hesitates highway acceloration. Thank you.

1. Reduced fuel economy
2. Increased exhaust emissions
3. Poor engine performance
4. Engine check light appears
5. Engine stalls during idling
6. A rotten egg odour emitting from the exhaust
7. Your engine surges or hesitates
8. Rich mixture

y is your check engine light on what codes does it give you

Mine was doing that also.. We changed the two EGR valves, changed spark plugs and wires, and finally cleaned the Mass Air flow Sensor with carburetor cleaner. That seemed to helped the most. You have to take the sensor off to do it.. you can find a youtube video that explains it. Now all I have to do is figure out why my car's RPM's surge when slowing down.

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.

Check engine light? Sounds like a bad coolant temp sensor.

why did it run hot?
how long did you drive it hot?
blown head gasket,ignition problems, bad coils,bad timing, fuel pump issues..

there could be several reasons for this type of problem. the engine is controled through main computer(ECM) and the sensors assocciated with it. most often times a hesitation is commonly a idle issue and that would be monitored by the TPS ( throttle position sensor) if this is beginning to fail it sends faulty reradings to the computer and the computer tries to compensate and sometimes either leans or richens the fuel air mixture cause and effect is a engine stall or a hesitation. another factor is your (O2) sensors these monitor your exaust and tell the ECM to adjust accordingly the fuel mixture also. a sure fire way to tell if one ore more sensors are faulty is to either have your check engine light come on or if there is a rough start. if the check engine light isn't on then i would think there is a timing issue involved and a tune up is in order. the tune up is simple by just changing plugs and wires, however the timing is computer controled and can only be adjusted by a certified tech with the proper equipment. try and change the plugs and wires first this is the least expensive way to solve your problem. if the problem persists then take it to a shop and have a tech hook up diagnostic tools to check the ecm for fault codes to narrow down whatsensors if any are faulty.

Does it run good when it is runnig as good as it used to? Is the check engine light on or does it come on before it stalls? If it weret for the days of computers just sounds like overheating as from clogged exhaust

We have a 2001 Chevy Impala as well.  About 3 months ago, we encountered the same symptoms.  The catalytic converter was bad and had to be changed out.  The cost, for a universal catalytic converter, was about $300 but this fixed the problem.  I hope this helps.

I am having an issue with MAJOR hesitation when I step on the gas. I've changed the fuel filter and the throttle control sensor. Any suggerstions?