Engine distributors DSG-423 User Manual

DSG-423 FUEL SYSTEM
04-26
Diagnostic Aids
Regulator Assembly (Converter & FCV): Check the regulator primer button for slight sticking or a small leak around
the seat. This may be enriching the mixture enough for a failure. If a leak is found, see section 475R-1 for servicing
the regulator. If no other problems have been identified, replace the fuel management assembly with a known good
part of the same pressure range. Retest.
5 Check air valve operation. Yes
No
Refer to section 475-1 for servicing the
carburetor.
Check the adapter plates between the
mixer and the manifold for leaks. If
none can be found, service the
carburetor (see section 475-1) and
retest. If the failure is still present
replace the FCV valve.
• Using the WTK-1 test kit, connect the vacuum gauge
between the carburetor and the FCV valve to measure the
carburetor air valve vacuum (AVV).
• With the engine at idle and accelerating observe the
amount of measured vacuum.
Is the measured vacuum non-linear and outside the
specifications?
Emission Failure - Lean Mixture (Continued)
Test Step Result Action to Take

Engine distributors DSG-423 Specifications

General

Brand	Engine distributors
Model	DSG-423
Category	Engine
Language	English