I have a UK Trooper 3.1D.
Just behind the gear lever there are 2 rocker switches. One operates
the radio aerial. The other has a little engine symbol on it. What
does it do? I've searched in the handbook but can't see any reference
Dennis Reynolds --
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Basically its a cold starting aid by way of a butterfly valve, operated by a
solenoid located in the exhaust. I recomend that you DONT use it as it has
a habit of jamming in the closed position. NOT recommended almost a total
loss of power best advice I can give is pull the connections off the switch
& tape them up
Not on our trooper it isn't it claims to be a ceramic heater and does not
affect the valve in the exhaust. Not on ours anyway. Not only that it
appears to work, the car does warm up faster, according to some people it
heats the coolant. Allegedly the valve in the exhaust works to aid engine
braking for off road use much as in larger commercial trucks.
Dave (I had to find out so I tested it)
The switch operates the exhaust back pressure valve. This is a cold
weather utility in the 3.1TD. When activated a circular valve
(electro-mechanically operated) partially closes in the exhaust
supposedly to aid engine heating. The engine increases in revs to
Re the ceramic heater, turning the heater control past the 2 o'clock
position will activate this and the engine tickover will increase from
about 700 rpm to 1000 rpm again to compensate for increased battery
drain by turning the alternator faster.
OK, I'll be testing this when we have cold weather. The valve in the exhaust
had jammed. I have striped and rebuilt it. It is operated by two vacuum
pipes which go back to the engine bay. Can't trace them though. The owners
manual says the switch is for a ceramic heater. There is a relay in the
engine bay that says ceramic heater and this is switched by the silly switch
in the car. The relay is much larger than that required to operate one of
the vacuum solenoid valves used in the engine vacuum circuits. There is also
a substantial fuse for the 'ceramic heater' in the fuse box. I can't
understand how a valve restricting exhaust gas flow would effect the warm up
at all. These are used in trucks though to assist engine braking. This is
most definitely a 3.1TD
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