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GECO

Stoichiometric Manual 03554
70 Woodward
Chapter 9.
Maintenance and Fault Indications
This chapter provides information for keeping the GECO™
 Stoichiometric
Air/Fuel Control in proper working order. Contact your GECO distributor for
service options.
The GECO

Stoichiometric Air/Fuel Ratio Control is designed to
supplement existing fuel controls in order to automatically provide
the optimum fuel mixture for emissions compliance. As described in
this manual, the system can be helpful for engine tuning and
diagnosis; however, the GECO

Stoichiometric control is not a fix for
an existing malfunction. The original engine, including the
mechanical components, air throttle(s), carburetor(s), governor,
ignition system, and safety shutdowns must be in proper working
order before the GECO

Stoichiometric control is put into operation.
Maintenance
The GECO
 Stoichiometric control and system components were designed to be
very reliable in operation. None of the components require any maintenance,
however the exhaust gas oxygen sensors intake manifold pressure sensors have
a limited life and will require regular replacement.
A regular program for engine maintenance should continue after the
GECO
 Stoichiometric system is installed. To provide emissions compliance, the
original engine systems need to be in proper working order. Please review the
warning statement above, and any warnings associated with the exhaust system
components (EGO sensors). The use of certain gasket and thread sealers or
high temperature thread lubricants can cause poisoning of the oxygen sensor.
Excessive engine oil consumption can also cause these effects over longer
periods of time. The GECO
 Stoichiometric system will relieve the operator of
constant carburetor tuning for emissions compliance, but consistent engine
maintenance is still required.
Safety Checks
The GECO
 Stoichiometric control alarm and shutdown relays should be included
in a regular safety check to verify their functionality.
Replacement Information
The highest maintenance requirement is for the automotive oxygen sensors
(EGO). The typical life expectancy for these components is on the order of 2000
hours, or about three months of continuous service.