• Tiny
  • adrian grieves
  • 2008 Vauxhall Zafira

Engine Performance problem
2008 Vauxhall Zafira 4 cyl Front Wheel Drive Manual 17000 miles

I have a diesel Zafira. Up until the last 2 weeks has been very ecconomical. Now the fuel consumption has increased dramatically. Being a creature of habit I do the same driving week in week out.

Consumption in a normal month is around 44 mpg
Now dropped to 36.
Instant read out when normal suggests 50-55 mpg at 50 mph in 6th gear.
When not normal this drops to 25-28 mpg!

On tick over when normal 0.1 gall per hour
When not normal increases to 1.1 gall per hour.

Its almost like driving with the brakes on!
Engine does not misfire or give any other symptoms.

Turning off and restarting corrects it for a whlie.
Does the computer deliver the fuel to the engine or does it mearly indicate what the engine is using?

Please help.

Friday, January 1st, 2010 AT 8:41 AM

1 Answer

  • Tiny
  • Dave H
  • Expert
  • 13,547 posts

Start by having the vehicle serviced (fuel/air filter etc.) .. the computer in conjunction with various sensors controls fuel injector ON time which obviously controls the amount of fuel used .. various sensors tell the computer how much fuel and air mixture needed depending on outside temperature, engine temperature, engine load, etc. etc. etc. ..

hope this helps


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Sunday, January 3rd, 2010 AT 8:18 AM

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