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E N G I N E C O N D I T I O N I N G
Before testing tailpipe emission levels, engines should be at operating temperature.
1.
Maintain engine speed at 2000 RPM for 30 seconds.
2.
Drop engine speed to idle for 30 seconds.
3.
Test the engine.
Some vehicles require special conditioning other than the procedure given here prior to testing idle emission levels.
Failure to follow conditioning procedures will usually cause vehicles to fail state tailpipe emission tests even though all
systems are operating as designed. For further assistance contact the state emission inspection program administrator.
C O N N E C T I N G P R O B E H O S E T O S Y S T E M
1.
Connect the FGA 4000 Analyzer power cord into a standard 120 VAC, 50/60 Hz electrical receptacle (or
240 VAC, 50/60 Hz, for analyzer set up for that voltage).
2.
Set the POWER switch on the front of the analyzer to ON.
3.
The analyzer enters the Warm-up mode immediately.
4.
Allow the analyzer to perform a complete Warm-up and Zero cycle. This may take up to fifteen minutes.
The remaining steps may be completed during analyzer warm-up.
5.
Connect the exhaust sample hose to the back of the analyzer at the filter assembly.
6.
Wait until the analyzer indicates that it is in the STANDBY mode.
7.
30 minutes after the analyzer is in the STANDBY mode, insert the probe into the vehicle tailpipe,
ensuring that the probe is fully inserted.
8.
Press the START key.
9.
Read the exhaust gas values on the displays.
10.
Compare the values shown to:
11.
All emissions standards.
12.
The engine manufacturer's specifications.
Figure 14
Connecting Probe Hose to System
NOTE:
On vehicles with diffuser screens in the tailpipe, use the optional Anti-Dilution Probe).
I N T E R P R E T A T I O N
A
fuel-injected engine that meets all of the above requirements may still have problems masked by the feedback fuel
control system. Consult the vehicle maintenance schedule and perform the recommended service that may be
required, including service on emission control devices.
If values exceed specifications and allowances, further diagnostic testing of the engine and exhaust system may be
required.
