My 4.5 Fuel consumption

[mvcoller]

So today I did a trip to Roodeplaat Dam from Bedfordview and back home via Jorrie in Magalieskruin.

The need for the trip was to go and collect a Front Runner Wind Cheetah roof rack that I bought in Roodeplaat for the Patrol.

Travelling to Roodeplaat at around 110kph GPS speed (120 indicated) the Patrol used 15,98lt per 100km or 6.25km/lt. I fitted the roof rack there near the dam and on the way home (plus some travelling in the suburban traffic in Magalieskruin), I returned again via the highway (R21) to Bedfordview, again at a similar speed as going north, this time with a noisy roof rack fitted. This time the consumption was 16.42lt/100km or 6.09km/lt/

To say I am chuffed is an understatement. The vehicle is not running exactly 100%, it has a misfire at idle, more pronounced when cold. It is less noticeable when hot, so I will have to start looking for the fault. I cant hear a misfire while travelling, but I am sure it is present. I somehow think it is plug leads, as I have changed plugs already and cleaned carbon build-up on the contacts inside the dizzy cap.

Aside from the plug leads, Jorrie suggested I also look for air leaks in the inlet duct between the MAF sensor and the motor. I am sure I will find the reason for the misfire and further improve the fuel consumption.

[Tinus lotz]

Malcom thys is n masien op daai motors hy Sal daai fout in no time kry gee hom n go jy Sal nie jammer wees nie

[mvcoller]

Ken nie vir Thys nie. Wie is hy en waar is hy? Hoe kontak ek hom?

[Tinus lotz]

Sal sy nommer stuur

[johanp]

The 4.5 has some kind of an expansion box in its intake. The bottom of this box melts because of the exhaust heat and leaks air into the intake.

[SJC]

The 4.5 has some kind of an expansion box in its intake. The bottom of this box melts because of the exhaust heat and leaks air into the intake.

This: viewtopic.php?f=44&t=7436

[mvcoller]

That box is actually an inlet tract silencer

Mine is still OK, but my Patrol no longer has the aluminium heat shield. I will find one, one day. The vehicle does however have what is often called a "banana branch", not the cast iron manifold.

The cast iron exhaust manifold retains a lot more heat and without the heat shield fitted, tends to burn holes in the inlet tract silencer.