Lotus TURBO ESPRIT Service Manual page 412

Page 40
SECTION L D . .
If
the sensor plate rest position i s too high, the stop pin for the rest position
spring may be adjusted by the careful use of a pin punch and light hammer.
CAUTION: Take care not to over adjust, as the mixture control unit must
then be removed for the pin to be knocked back. Repeated adjustments w i l l
loosen
Rest position Pin
If
adjustment has to be made, also check ignition system as the likely cause of
sensor plate mal-adjustment i s backfire down inlet system.
3. Check the free movement of the airflow sensor and fuel distributor control valve,
and comparative fuel delivery between injectors
.
Remove each injector from
m n i f l o d (leave pipe attached) and
lace
i n graduated flask ~ 0 0 0 ~ 0 5 9 4 ~ .
Trip inertia switch. Remove fuel pump control relays and f i t electrical test
bridges TOOOT0569 into relay bases. Depress inertia switch.
a)
Press down the airflow sensor. The same resistance must be felt over the entire
movement.
Move the sensor plate rapidly back to a position just i n front of the zero stop.
The control plunger follows this rapid movement
pf
the sensor plate only
sluggishly, and therefore initially loses contact with the sensor plate lever.
It
must be possible, however, to feel the.plunger make contact with
this
lever again.
If
this condition i s fulfilled, the control plunger can be
considered to move freely.
b)
Check that the control lever moves freely;
press the sensor plate to its
full deflection again, and then release i t . The semor plate should snap back
to the zero position and bounce up about twice from the spring-loaded stop.
c)
Trip inertia switch and remove test bridges.
Compare quantity of fuel delivered from each injector.
Maximum permissible difference between any two injectors:
7.0
%
If this
tolerance
i s
exceeded, interchange injectors and/or injector feed pipes,
and repeat test to establish whether fault lies with injecto~feed pipe, or fuel
distributor. Replace parts as necessary.
If
the semor control lever i s found not to move freely, free pivot as necessary,
or replace airflow sensor.
If
the control plunger does not move freely, remove fuel distributor for access
to plunger: