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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: An Oasis in the Desert
>
>1. Keep my Bosch plugs for a while and see what happens.
If you want. I've found that Bosch stadnard plugs do not perform
quite as well as Champions or NGK, but are better than most common
American plugs. I have, however, never had any success with their platinum
plugs. If the engine is running well, they don't seem to make any improvement,
and if the engine is not well, they foul easily and are not cleanable. I
pretty much toss them one sight.
>My dealer said the problem was the vacuum servo. So, I connected an
>extension cable from the cable going to the servo and ran it back into the
>driver's compartment. While driving (carefully) I measured the voltage on
>each leg of the cable. Sure enough, I got 13.8 volts when I tried to engage
>the cruise and zero when I hit the brake or turned the main switch off. My
This is a good sign. It means the power, set, and brake switches are all
working. You only get voltage to the servo when the system is active.
>guess is that one leg energizes the a solenoid that allows vacuum into (out
>of?) the bellows while the other leg vents to atmosphere when set speed is
Not quite. One solenoid is pure a vent, open or closed. The other solenoid
is a double action, vent or vacuum. The system power comes in on the
center leg, attached to both solenoids. The other side of the vent
solenoid is connect directly to ground. As long as the system is active,
power applied, this solenoid is closed. the other side of the second solenoid
is connected to the ECU. The ECU pulses this line to ground, alternating
the solenoid between vent and vacuum. It varies the accuation amount by
varying the duty cycle of this pulse. This is the solenoid that fails, as
it is constantly fluttering.
>Since the dealer wants $400 for a new servo, I have to fix this thing.
Those of us not locked in to the Jag parts distributing system, i.e.
the independents, have an alternate source for this servos, plus we can
get the bellows as a seperate service item. They still aren't cheap, as
they come through a different British car parts network (RR!), but
the servo is about half what Jag wants.
>
>Mark Revels
>85 XJ6
Randy K. Wilson
randy@taylor.infi.net
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