5.7 Hemi Fuel Consumption

[JAJEEP]

Hi
Just bought a 2006 Grand Cherokee 5.7 Hemi seems to be using a lot of fuel 25lt per hundred, city driving.Changed the plugs hasn't made much difference it's also hard to start sometimes and also stalls at start up. Any ideas please?

[dwalker747]

2.5 Ton car and a Hemi. From memory around town they were quoted at about 22-23 in testing so 25 would not be unusual. I wouldn’t have thought.

Stalling after start would possibly be a fuel supply issue, perhaps one of the pumps is done.


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[MRGC]

Mine gets 15.3l per 100km, but when on the hey long distance I get as low as 10l per 100km.

I think the fuel filter is part of the pump, that may cause start issues.


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[JamesLaugesen]

I've got around 18-19L/100 on the few times I've driven in the city (like Sydney CBD, Eastern suburbs, etc.). 15-16L in the Suburbs with mud tyres, armour, roof tent, full loaded with gear, etc.
So 25L does seem a bit high, assuming you're not booting it everywhere.

I had high consumption and occasional stalling at start-up when the EGR valve died (prior to getting an error code.), at around ~100,000km from memory.

Engine oil viscosity can have an impact, as it needs to be within a narrow range for MDS to work correctly. It must be 20 weight as-per the filler cap. I use 0W-20. But dunno if MDS would activate much in the city anyway.

[JAJEEP]

I've cleaned the throttle body which was filthy and changed the air cleaner and its dropped down to 17/18 L. Don't think the previous owner kept up the maintenance. Try a oil change as well.

[dwalker747]

Originally Posted by JAJEEP

I've cleaned the throttle body which was filthy and changed the air cleaner and its dropped down to 17/18 L. Don't think the previous owner kept up the maintenance. Try a oil change as well.

Clean the MAF on the intake too?

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[JAJEEP]

Haven't tried cleaning that seems limited access there to take it off?