Grand Cherokee CRD - naff fuel consumption!
Discussion
I've recently bought an 05 Grand Cherokee CRD (I think it's a Merc engine). Pulls like and train and great to drive but can't get more than 21 mpg!? It's often as low as 17 mpg, even after a long run. It's supposed to have an average of 27.7 mpg. It had a torque converter problem which was sorted by changing the transmission fluid. I was hoping that was causing the poor consumption but it hasn't changed. Anyone got any ideas?
shortshift said:
I've recently bought an 05 Grand Cherokee CRD (I think it's a Merc engine). Pulls like and train and great to drive but can't get more than 21 mpg!? It's often as low as 17 mpg, even after a long run. It's supposed to have an average of 27.7 mpg. It had a torque converter problem which was sorted by changing the transmission fluid. I was hoping that was causing the poor consumption but it hasn't changed. Anyone got any ideas?
US gallons or imperial?I'm pretty sure it's not a Merc engine - it's made by an Italian company called VM Motori and is shared with an LDV van. Sorry to burst your bubble, but if you want a cruddily made 4x4 with a Merc diesel engine may I point you in the direction of a Ssangyong...
Sorry, I have nothing constructive to add
Sorry, I have nothing constructive to add
jamiebae said:
I'm pretty sure it's not a Merc engine - it's made by an Italian company called VM Motori and is shared with an LDV van. Sorry to burst your bubble, but if you want a cruddily made 4x4 with a Merc diesel engine may I point you in the direction of a Ssangyong...
Sorry, I have nothing constructive to add
I'm pretty sure it is a Merc engine. Why would Daimler-Chrysler buy a VM engine that just happens to be and identical displacement, bore, stroke and output to their own 3.0 diesel six when they already make one. . . . . . . .Sorry, I have nothing constructive to add
As for the OP and fuel consumption - I know people with a couple of these and they seem to give around 25mpg. Has it had a good service with all new fuel filters etc recently?
OnTheOverrun said:
jamiebae said:
I'm pretty sure it's not a Merc engine - it's made by an Italian company called VM Motori and is shared with an LDV van. Sorry to burst your bubble, but if you want a cruddily made 4x4 with a Merc diesel engine may I point you in the direction of a Ssangyong...
Sorry, I have nothing constructive to add
I'm pretty sure it is a Merc engine. Why would Daimler-Chrysler buy a VM engine that just happens to be and identical displacement, bore, stroke and output to their own 3.0 diesel six when they already make one. . . . . . . .Sorry, I have nothing constructive to add
As for the OP and fuel consumption - I know people with a couple of these and they seem to give around 25mpg. Has it had a good service with all new fuel filters etc recently?
te.
Probably worth checking the gearbox is fixed.From about 2000 till 2002, it was a 3.1 VM engine, replaced in 2002 by a Merc 2.7 - both five pots. After 2005, think it was a 3.0 Merc V6.
Mum's other half drives an 02-plate Grand Cherokee with the 2.7, has the Merc badge on a pile of components under the bonnet. His is an auto, not sure what his average consumption is, but I can ask?
Big old hunk of steel to be lugging around, though, and with an auto, I'm not sure anything much above low 20s mpg can be expected really, especially if you like to make full use of the Merc lump!
Mum's other half drives an 02-plate Grand Cherokee with the 2.7, has the Merc badge on a pile of components under the bonnet. His is an auto, not sure what his average consumption is, but I can ask?
Big old hunk of steel to be lugging around, though, and with an auto, I'm not sure anything much above low 20s mpg can be expected really, especially if you like to make full use of the Merc lump!
Those mpg figures are all done on an artificial circuit and are only useful for comparing one car against another measured over the same circuit. You'll be lucky to get within 75% of them in real life.
Try turning off the aircon, lift off the gas when going down hill, increase your tyre pressures and try to anticipate at junctions so you don't slow down to a complete stop (all where safety allows of course). All that might get you 2-3 mpg more, but unless you habitually hoon around in it you won't see much more than that by changing your driving style.
Try turning off the aircon, lift off the gas when going down hill, increase your tyre pressures and try to anticipate at junctions so you don't slow down to a complete stop (all where safety allows of course). All that might get you 2-3 mpg more, but unless you habitually hoon around in it you won't see much more than that by changing your driving style.
WH model (mid 2005 onwards) uses the V6 merc unit. If your MPG is taken from the digital display then disregard it completely. The onboard computer is innacurate and uses US gallons.
I have had 17 CRD WH grand cherokees and 27mpg is quite easily reachable. On Motorway running 30mpg is not unusual. If you are getting less than 25 AND are driving a fair mix of urban/extra urban roads then i'd suggest a delaer visit. Before doing so though calculate your actual economy accurately.
The killer for these engines is city running where 18-20 mpg is more realistic. Have a look at some of the aftermarket performance chips as these can add 10% to the economy depending on the driving style.
Lastly, do not skimp on servicing. These things will run like a watch if maintained regularly and correctly. Use the recommended oil (but don't buy from the dealer) and make sure it gets a good blast on occasion.
Shout if you need anything else,
Mark
I have had 17 CRD WH grand cherokees and 27mpg is quite easily reachable. On Motorway running 30mpg is not unusual. If you are getting less than 25 AND are driving a fair mix of urban/extra urban roads then i'd suggest a delaer visit. Before doing so though calculate your actual economy accurately.
The killer for these engines is city running where 18-20 mpg is more realistic. Have a look at some of the aftermarket performance chips as these can add 10% to the economy depending on the driving style.
Lastly, do not skimp on servicing. These things will run like a watch if maintained regularly and correctly. Use the recommended oil (but don't buy from the dealer) and make sure it gets a good blast on occasion.
Shout if you need anything else,
Mark
shortshift said:
I've recently bought an 05 Grand Cherokee CRD (I think it's a Merc engine). Pulls like and train and great to drive but can't get more than 21 mpg!? It's often as low as 17 mpg, even after a long run. It's supposed to have an average of 27.7 mpg. It had a torque converter problem which was sorted by changing the transmission fluid. I was hoping that was causing the poor consumption but it hasn't changed. Anyone got any ideas?
What did you drive before?With any diesel auto, a "press on" style of driving absolutely murders the MPG. You've got to back off the gas pedal and let the car almost ease itself along using the engine's torque.
I have a Merc C270CDi auto and I can get 50MPG on the display if I'm in the right frame of mind, but any hint of pushing and it'll be low 40's. Around town it does low 30's.
Having said that, how many miles has it done? It could have injector issues etc, and you wouldn't really notice any power drop-off.
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