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Topic: Fuel economy (Read 907 times) |
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Fuel economy
« on: Mar 27th, 2009, 11:05pm » |
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Noticed recently my fuel economy has been dropping a bit.
Currently averaging around 19 - 20mpg with mixed driving - was getting 23 - 24 a few months ago.
I'm quite careful with the ol' right foot, no traffic light GP's
Car is a 2.3 auto Ultima estate.
Any tips of what to check first ?
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD 
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Fuel economy
« Reply #1 on: Mar 28th, 2009, 12:49am » |
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Injector cleaner may help, but unlikely to make a big difference unless you’ve not used it for a long time.
I recently had a small exhaust leak between the manifold & cat that seemed to drop the mileage by about 2 mpg.
Stat? - does the engine warm up quickly - even if it does a faulty engine temp sender will have an effect.
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ABS multiplug wheel sensor pins MK IV or MK 20
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Fuel economy
« Reply #2 on: Mar 28th, 2009, 2:47am » |
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Faulty ECT or IAT causing cold fueling, or possibly a blocked air filter ?.....also binding brakes
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Simmo
Administrator
I'm an OAP !
Posts: 5508
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Re: Fuel economy
« Reply #3 on: Mar 28th, 2009, 7:56am » |
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Have you cleaned the MAF Mike?.
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Now I'm an OAP
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Highlander
Moderator
Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
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Re: Fuel economy
« Reply #4 on: Mar 28th, 2009, 2:25pm » |
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been serviced recently? old spark plugs will do that too 
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: Fuel economy
« Reply #5 on: Mar 28th, 2009, 10:27pm » |
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on Mar 28th, 2009, 2:47am, Jonnycab wrote:| Faulty ECT or IAT causing cold fueling, or possibly a blocked air filter ?.....also binding brakes |
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What are ECT & IAT
Brakes not binding, will check MAF + air filter and change plugs.
Oil change was done a few months ago when the car was MOT'd.
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Fuel economy
« Reply #6 on: Mar 28th, 2009, 11:13pm » |
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Mike.
Water and inlet air sensors informing the ECU,or as it is now known,PCM power control module !
GOZZ.
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Simmo
Administrator
I'm an OAP !
Posts: 5508
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Re: Fuel economy
« Reply #7 on: Mar 29th, 2009, 6:31am » |
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Mike. The details of the units are HERE. The inlet air temperature sensor is fitted,on mine, in the underside of the air trunking just prior to the throttle assembly.
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Now I'm an OAP
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Tons_of_fun
Full Member
Mmmm...Xena !
Posts: 978
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Re: Fuel economy
« Reply #8 on: Mar 29th, 2009, 3:26pm » |
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When i first got the cossie it was doing about 17mpg under mixed driving. changed the plugs, air filter & cleaned the MAF, im now getting about 21mpg with 29.3 at a controlled 65mph. Not too bad in my honest opinion . One thing i have noticed though. If i try & keep the engine under 2000rpm ( yep quite difficult), it makes a world of difference to the economy. Only downside is people behind you keep shoutin "Take your handbrake off " !!!. At 90p per litre they can shout all they like 
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Lord...Sometimes im not that bright
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