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Author Topic: MPG  (Read 1099 times)

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rinkleyrob

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MPG
« on: 18 October 2011, 16:57:14 »
Hi just had new cat & exhaust right through, new maf meter, new camshaft sensor, fuel consumption now terrible, 18 to 20 mpg. Any suggestions as to what could be wrong. Regards Rob
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Darth Loo-knee

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Re: MPG
« Reply #1 on: 18 October 2011, 17:09:08 »
was it better than that before you changed the above parts?
You dont mention which engine you have in your Omega!
Sounds rather low for a V6 though..
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rinkleyrob

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Re: MPG
« Reply #2 on: 18 October 2011, 17:16:52 »
It's a 2.2 auto 2001 and it was much better.
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henryd

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Re: MPG
« Reply #3 on: 18 October 2011, 17:27:53 »
Were the new maff and cam sensors genuine parts ?
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rinkleyrob

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Re: MPG
« Reply #4 on: 18 October 2011, 17:30:50 »
as far as i'm aware bought from vauxhall spares site
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ndmv6

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Re: MPG
« Reply #5 on: 18 October 2011, 17:31:17 »
i found that with my 2.2 petrol,same happened to mine after ide fitted a lot of new parts,inc cat,i get 19/20  around town and late 2o,s on a run,i fitted new cam shaft sensor,new cat,lambda sensors,maf,left the battery off for about an hour,this seems to re set the ecu,s values in my opinion,then connected the battery ,mpg was poor at first,and got a lot better after driving around 100 miles,with a mixture of town and motorway driving...
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PhilRich

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Re: MPG
« Reply #6 on: 18 October 2011, 17:31:42 »
Putting a new set of plugs in may improve things a bit but the 2.2 struggles to better 22mpg around town :(
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ndmv6

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Re: MPG
« Reply #7 on: 18 October 2011, 17:34:39 »
patterned cats = bad fuel economy
aftermarket maf,cam sensor,crank sensor,lambda sensors = bad fuel economy.
as ive have learned,the omega will only run efficiently on genuine gm electrical parts...imo
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rinkleyrob

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Re: MPG
« Reply #8 on: 18 October 2011, 17:39:28 »
can't be sure about cat I never fitted it I know O2s genuinine as I sourced them, will try new plugs & the battery method, thanks for all your help. Rob
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flyer 0712

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Re: MPG
« Reply #9 on: 18 October 2011, 21:28:45 »
hi just to add...my 2.2 omega which i keep up to scratch has never done more than 22 m.p.g.around town...ray
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