Hello everyone, my name is miguel I'm Spanish. I'm new to the forum using google translator so that I do not understand and do not ask where I have the problem, currently I have a 3.1 v6 pontiac firebirs 1991.
The problem with my car is that it consumes a lot of petrol, has a consumption of 11mpg.
anyone knows why is this happening? that part does not work?.
thank you all and I hope for help me.
I apologize if I have posted in the wrong place

 

11mpg? wow that's horrible mpg. You should be getting around 18mpg at least. Have you checked for fuel leaks? Gas tank, Correct Tire pressure? Do you keep the engine tuned up? All the obvious checkpoints?

 

take 3.5 gallons yesterday and I have traveled 38 miles, this is normal? I think not.

 

the engine does not leak, air filters / oil / fuel, new spark plugs, new oil, new oxygen sensor, tire pressure 32 psi , Will clean the intake manifold with sensors relenti.

 

Vacuum tubes are not leaking, the engine is tuned, co2 test I did gave me when 6.50mg 1.50mg should have given

 

sorry the car will take 2.8 gallons and I toured the 38 miles

 

with 3.8 gallons walking 57 miles, mixed use city / highway. anyone can help me? I have changed and checked other rooms.
the egr valve off I have to try, when you connect the computer to the car to find some fault, this tells me not to and electric engine failure

 

my intake is 11 to 13 mpg.

 

It also depends on driving habits. If you peel away from every intersection mpg go down drastically. Mine is a V8 and usually if I baby it I'll get 16 city 25 hwy or 20 combined but If I don't baby it and let my foot go and speed on the street or speed on the freeway I'll be lucky if I get 10 mpg.

 

Check fuel pressure & (important part) bleed down rate. It should hold at least 35 psi with the engine off.
Is the engine running cool? It should be running between 190-200* while going down the road.
Remember some gallons are metric gallons, so there might be some confusion there.

 

hello, thanks for the help, say that my car is always at legal speeds and do not know what is going from 1500rpm.

tomorrow I will try to watch what the fuel pressure, any ideas more to look that can be this high consumption?

 

Check engine light on?
Vacuum leaks, especially at map sensor.
A bad o2 sensor.
Ignition timing off or not advancing.

 

check light is off and does not give me any errors
vacuum tubes map sensor, are well
and probe C O 2 is new.

morning proves the fuel pressure valve as it is broken

 

Hello, I have a question, the pressure valve petrol work? by suction or blowing? .
BEGINS single to reach 35psi?
I have seen is that the tube pressure valve has a T-shaped tube which goes toward each butterfly induction and another to pump air to below the alternator.

I've also seen that the tube coming from the pump valve goes procente wing air pump and the air is sucked through the tube that goes to Butterfly Induction