Vehicle Testing
3-15
Before Testing
Assemble the following equipment and be sure to have the
information described in this section available.
X
Propane supply tank.
X
Flow meter, part number 1-15381. The flow rate is based on the
engine displacement and exhaust system configuration.
X
Propane enrichment assembly, part number EAA0259L00A.
X
Assorted rubber hoses and "tees". It is advisable to obtain a
rubber "stopper" with a hole in the center to connect to a brake
booster hose.
X
Battery charger. It may be necessary to connect a battery
charger to boost the battery if cranking RPM drops too low
during the test.
X
Identify how to disable the fuel and ignition systems. For
additional information refer to
Disabling the Fuel System‚
page 3-17
and
Disabling the Ignition System‚ page 3-17
.
✓
Check in the vehicle owner's manual or use an
information system to locate the vehicle power distribution
center(s).
X
Locate propane injection point.
X
Vehicles with single catalytic converters
— Perform the test by adding the specified amount of propane
through a large manifold vacuum source on the engine like
the PCV or power brake vacuum booster hose.
X
Do not exceed specified propane flow. Excessive propane
overheats the catalytic converter.
X
On vehicles with multiple tailpipes exiting the muffler, the
exhaust probe may be placed in any functional tailpipe.
X
On vehicles with multiple tailpipes, cap unused openings with
appropriate plug device.
— This is especially important if an exhaust venting system is
connected to the tailpipe. The system may pull air in through
the unused tailpipe and dilute measurements.
X
On closed loop carbureted engines the proper propane flow is
determined by analyzing the exhaust CO
2
level resulting from
the initial cranking event (purging of residual gases).
— CO
2
less than 2% - use full amount of propane as
determined from the engine displacement value chosen
during setup.
— CO
2
between 2% and 4% - use one-half the amount of
propane specified in the
Conversion Table for Proper
Propane Flow‚ page 3-16
for the engine displacement
value chosen during setup.
X
Do not exceed specified propane flow. Excessive propane will
overheat converter.
X
Operate engine at 2500 RPM for 3 minutes to pre-heat the
catalytic converter.
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