Grand Cherokee Sudden fuel use consumption increase after service





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  1. #1
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    Default Sudden fuel use consumption increase after service

    HI Guys,
    my 2009 GC WK went in for a 80,000km service 3 weeks ago. Oil lube, Gbox & Tcase lube, aircleaner, diesel filter etc..
    Since then I have noticed a dramatic fuel consumption increase, from 10.5l/100km to 12.9l/100km. Daily route& driving style is the same. What could be the issue? Diesel filter, air cleaner? Workshop says "we don't know"! Diesel filter Part number on invoice is WF8353, seems OK to me.
    Thanks.
    Last edited by Oaktree; 2019/07/27 at 09:54 AM.

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    Default Re: Sudden fuel use consumption increase after service

    Quote Originally Posted by Oaktree View Post
    HI Guys,
    my 2009 GC WK went in for a 80,000km service 3 weeks ago. Oil lube, Gbox & Tcase lube, aircleaner, diesel filter etc..
    Since then I have noticed a dramatic fuel consumption increase, from 10.5l/100km to 12.9l/100km. Daily route& driving style is the same. What could be the issue? Diesel filter, air cleaner? Workshop says "we don't know"!
    Thansk.
    Check that all the cable/plugs are connected.

    If not, dis they change a cam belt maybe? Cam timing.
    Last edited by Henris; 2019/07/27 at 09:50 AM.
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  3. #3
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    Default Re: Sudden fuel use consumption increase after service

    Quote Originally Posted by Henris View Post
    Check that all the cable/plugs are connected. Yes

    If not, dis they change a cam belt maybe? Cam timing.
    No. Has a chain, not a belt.

    Thanks.

  4. #4
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    Default Re: Sudden fuel use consumption increase after service

    Maybe they loaded a new map on the ecu?

    Indi service or dealer?

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  6. #5
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    Default Re: Sudden fuel use consumption increase after service

    If they replaced gearbox oil on the WK CRD did they use correct merc oil and filter. Maybe gearbox must still relearn your driving style?
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  7. #6
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    Default Re: Sudden fuel use consumption increase after service

    Quote Originally Posted by carlp View Post
    Maybe they loaded a new map on the ecu? They didn't tel me, I didn't ask though. Why would they do this without consultation or request from me?

    Indi service or dealer?
    Independent. Been servicing the car since 2016. No problems with them before.

  8. #7
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    Default Re: Sudden fuel use consumption increase after service

    Quote Originally Posted by MikeS View Post
    If they replaced gearbox oil on the WK CRD did they use correct merc oil and filter. Maybe gearbox must still relearn your driving style?
    Yep, correct spec oil were used in the autobox (ATF+4) & transfer case(NV245/247). Last suggestion is interesting! How can the autobox "forget" my driving style?
    Thanks.

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    Default Re: Sudden fuel use consumption increase after service

    Are you basing this on the on board computer? Or actual measurements between tanks?

    The computer can often take a while to get an accurate readying after being reset, which was very possible when they reset your service interval.
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  10. #9
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    Default Re: Sudden fuel use consumption increase after service

    Quote Originally Posted by Quiksilver View Post
    Are you basing this on the on board computer? Or actual measurements between tanks?
    Using onboard computer. 1st fillup after service will only be a week to go. Previously the onboard computer & past consumption stats were very close. Using same diesel as well(Total 50ppm)

    The computer can often take a while to get an accurate readying after being reset, which was very possible when they reset your service interval.
    How many km does the computer take to "learn"?
    Thanks.

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    Default Re: Sudden fuel use consumption increase after service

    It has been colder the last couple of weeks. I get a feeling that my Jeep injects quite a bit more fuel when it is cold to heat up the engine. This may have an impact on fuel economy, especially if you drive short distances from cold start.

    Perhaps also check that nothing is wrong on the air filter. Doesn't like a restricted air filter.

    P.S. My 2005 WK is at 325000 and still going strong.

    I currently get about 12.5l/100km with a 15 km commute consisting of mostly city driving. Long distance highway travelling it can go down to 10l/100km.
    Last edited by GerritS; 2019/07/28 at 10:03 PM.
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