Lotus TURBO ESPRIT Service Manual page 414

Page
42
F
-
VACUUM SUPPLY
Use the vacuum switching diagram and a
0.30
in. Hg vacuum gauge to measure the
vacuum available at the ignition solenoid, throttle jacking capsule, thermal ignition
valve, and distributor advance capsule under the different engine coolant temperatures.
A
minimum of
18
in.
Hg
should be recorded at any point i n the vacuum line switched
to the vacuum pump (with engine running).
If
a lesser figure is obtained, check at the vacuum pump. If pump performance i s
below specification, check vac
.
pump exhaust pipe for restriction, and
'V'
belt drive
for fault.
Replace pump
i f
necessary.
With satisfactory vacuum pump performance, clamp off, or disconnect individual
components to isolate leaks and replace pipes or components as necessary. Check
secure f i t of a l l vacuum pipes.
-
Upstream Throttle Port
Throttle
Edge
Drllllng
VACUUM SWITCHING DIAGRAM
-
BELOW 53' C WATER TEMP.