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Why is my Vectra 2.2 sri auto burning too much fuel after servicing it in feb 15?

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  • Cars & Trucks Master
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Fuel is metered to the injectors on a signal from the coolant temperature sensor. When the sensor fails the engine will be slow to start the first time and there is a strong odor of gasoline. Turn it off and it will start right up. There will normally be no code. Idle is sometimes affected. Fuel milage will be lower than normal

Posted on Apr 13, 2015

  • 5 more comments 
  • Saj Bashir
    Saj Bashir Apr 14, 2015

    The car is fine at start up no smell of any sort and temp guage is fine too ive had 3 diagnostics dun no codes wat so ever evn changed both lambda sensors and still the car is drinking alot of fuel.

  • Jake Sysk Apr 14, 2015

    There are two sensors one for the gauge and one goes to the computer.

  • Saj Bashir
    Saj Bashir Apr 14, 2015

    Should i try changing the temp sensor guage

  • Saj Bashir
    Saj Bashir Apr 14, 2015

    What sensor do i change thanks

  • Jake Sysk Apr 14, 2015

    The sensor With two wires. Your auto parts store knows

  • Saj Bashir
    Saj Bashir Apr 14, 2015

    Ok thanks for the help

  • Saj Bashir
    Saj Bashir Apr 19, 2015

    Hi there ive changed the coolant temp sensor and it has made no difference.when the car is sittn at idle it is choking struggling to stay on and is atill drinking alot of petrol.this has happend ever since i changed the fuel filter third time round i put a genuine GM fuel filter in and no change in fuel consumption.

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  • Cars & Trucks Master
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Fuel is metered to the injectors depending on a lot of information from several sensors.

It would be the height of coincidence for a sensor to begin sending wrong information just when a car is serviced and if that really has happened it is just as likely to be one of the other sensors as the coolant temperature sensor.

Clearly the first thing to do is to verify the servicing work has been carried out correctly and whoever did the work hasn't clumsily left a rag in the air cleaner or something equally elementary, such as accidentally knocking off the vacuum line to the fuel pressure regulator.

Posted on Apr 19, 2015

  • 2 more comments 
  • Jake Sysk Apr 19, 2015

    one injector is failing to close fully.Unplug them one at a time and check results. A permanent magnet near an injector will cause it to stay open. Mechanics use them and sometimes one gets left under the hood and gets near an injector causing it to stay on

  • Saj Bashir
    Saj Bashir Apr 20, 2015

    Hi i services the car myself all air pipes and intake pipes are fine what other sensor would you suggest as a cheaper option to this probel i have i dont know if a mention its an automatic petrol engine

  • Vernon Taylor Apr 23, 2015

    If the engine runs well and smoothly and apart from the fuel consumption behaves fairly normally it is unlikely to be injector related. The data for the sensors is all available so voltages, resistances and suchlike can be checked with old-fashioned meters but it would probably be lass hassle and cheaper in the long term to take the car to a specialist sooner rather than later to have the live data checked with specialist equipment.

  • Saj Bashir
    Saj Bashir Apr 24, 2015

    Ok thanks for your help will let you know how i get on.

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