Co Adjustment - Lotus TURBO ESPRIT Service Manual

Page 20
SECTION EMA
SUB GROUP G
-
CO
Adiurtment
----
1
.
Fit exhaust probe to exhaust outlet pipe o f turbocharger and connect to CO/HC
analyser (e .g
.
Sun
EPA 75
or equivalent).
Exhaust probe connect ion
!
Start engine and allow to peach normal running temperature
i
.e. o i l and coolant
'
temperatures stabil ised
.
2. Switch analyser to sample mode and check readings.
Note:
Do not touch idle adjustment screws until C O reading has stabilised.
CO
reading shquld be betwben
0.2
-
1.2%.
I f higher or lower ievels are found
ensut-e carburettors are balanced (see Sub Group
F)
beforecontinuing.
.
Remove anti-tamper plugs and move each mixture screw
$
o f a turn i n or out
as
the reading dictates. Check the
CO
reading and repeat procedureuntil correct
specification i s achieved.
A
balance between C O and HC i s required, and the
Hexane level should be below
550
ppm
for
a 'new' engine and below 350.ppm for
a 'run-in' engine.
a
3.
When adjustment i s complete,
fit
anti-tamper plugs.