Question about 1990 Pontiac Bonneville

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Burns through gas

The car is running through gas like it's water. We did a comlete tune up on it but it did not work.

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Have you checked the oxygen sensor.they get old + contaminated and the signal sent to the efi is to tell it to run richer than it should.

Posted on Oct 10, 2008

  • tony yeatman
    tony yeatman Oct 11, 2008

    A bottle of injector cleaner in fuel tank as it could be dirty or unservicable injectors



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I have a 2001 park ave that burns too much gas.I had it tuned up and it still drink too much gas.How can this be fixed

run the fault codes and find what sensors are affecting the consumption
tune ups are not necessary and only cost money as the ECM is continually tuning the engine every second of operation
If it cannot keep the engine in tune it will set a fault code for you to fix
next you will have to have realistic expectations for the economy that you expect to get
There are many things that need checking like brake drag, tyre pressures , wide tyres, bigger tyres, your driving habits, if over drive is operational, dirty air filters , worn engine, blocked cat converter, load and speed, city or country driving ,lots of hills , faulty injectors , low fuel pressure, incorrect exhaust system
The list goes on and any one or a combination of some will give poor economy.

May 23, 2015 | 2001 Buick Park Avenue

1 Answer

Gmc sonoma pickup uses too much gas

Its a truck, Trucks were never known to get good gas miledge, Tune it up, That might help a bit, End ease of the gas ,

Nov 10, 2012 | Cars & Trucks

1 Answer

1995 buick lesabre vehicle has no power when going up hill and burns alot of gas

Hi RJ,

If the shop that performed the tune up didn't put the car on diagnostic test equipment - they may not have noticed a problem; as normal engine speeds needed for a tune up are seldom greater than idle.

Sounds to me like you've got a problem with the emissions system - or one of the sensors that provide information to the on board computer. This could be anything from clogged catalytic converter to a failed oxygen sensor.

Generally, you'd see a "Check Engine" or "Service Engine Soon" indication on the dashboard. Check to see if the bulbs work by shutting the car off, then turn the key from off to the start position - slowly. One position should give a "bulb check" - meaning power is applied to the indicator lamps in the dashboard to show you that the bulbs work. Note any that do not come on (you might need to consult your owner manual to learn what & where these lamps are). You should see the Oil, Temperature, Brake , etc. lights come on - along with the "Check Engine" / "Service Engine Soon" light (among others). The "Check Engine" / "Service Engine Soon" lights are usually yellow - while the others are red. If the light does not come on, you may be unaware of a problem because the light doesn't work as expected.

I'd return to the shop that performed the tune up and explain the symptoms and see if they can help. It may very well be something that a tune up can not fix.

Lastly, when you have a problem with the car - you might be better explaining to the service provider what the problem is - and let them figure out the cause; rather than doing the diagnosing yourself and assuming a tune up will fix the problem. When you do that, the provider simply does what you've asked. They know nothing of the problems you're experiencing.

I hope this helps & good luck!

Aug 23, 2012 | 1995 Buick LeSabre

2 Answers

95 Mazda b2300

Sounds like there is unburnt fuel. Could be a spark plug that's burnt out and therefore just flooding a cylinder. Which would push out fuel through the exhaust valve on the exhaust stroke. So once the fuel hits the inside of the exhaust manifold, it burns white, as if you're boiling it off. That one cylinder could have a damaged compression ring on the piston, so the fuel is bypassing it and going into the oil.

I would have your engine tuned up, and check the compressions on the cylinders.

May 27, 2012 | Mazda Cars & Trucks

1 Answer

1993 Dodge Spirit Promble, died, lost power,We checked,air filter,sparked plugs, gas line fuse,roter cap, belts,battery,prime it,gas line link age, new gas, seems to firer, but acts as if its not geet

If you expect you old reliable to maintain perfect tune-up status after TWO years, you are expecting too much, it could be many small things. Do a complete inspection before changing so many parts.

Apr 25, 2012 | 1993 Dodge Spirit

1 Answer

1998 buick park supercharge is using more gas then normal not sure what to do or what the problem is help


Jan 13, 2012 | 1998 Buick Park Avenue

2 Answers

I am smelling fuel and it burns alot of gas.

Check for leaks, service engine lights since CTS (Coolant temp sensor) can cause the vehicle to run rich. Keep in mind that there is a lot of Ethenol in our gas that is lowing the gas mileage on our vehicles.The canister purge tank can cause gas smell if it isn't working right, but the computer should give you a service engine light on any of these.

Mar 28, 2011 | 1997 Ford Expedition

1 Answer

Burns a lot of gas, shows no code even when gas cap is left off

try doing a standard tune up. change fuel filter, plugs, wires, and 02 sensors to start.

Apr 23, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

Smoke shift funny

as the oil gets way way too old to be in the engine anymore, it thins and burns easily. when last its last svc? as for the ful, sounds rich maybe tune up time? or a bad idle air contol solenoid?

Aug 24, 2009 | 2000 Jeep Grand Cherokee

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