Z00047
Tachometer
180 Seconds
2,500 rpm
A01746
CO Meter
EM--2
--
ENGINE MECHANICAL
CO (1RZ, 3RZ--F)
5. INSPECT CO CONCENTRATION
(a)
Check that the CO meter is properly calibrated.
(b)
Race the engine 180 seconds at about 2,500 rpm before
measuring concentration.
(c)
Wait 1--3 minutes after racing the engine to allow the con-
centration to stabilize.
(d)
Insert a testing probe at least 40 cm (1.3 ft) into the tail-
pipe, and measure the CO concentration within a short
time.
Idle CO concentration:
1.5
±
0.5 %
S
If the CO concentration is within specification this
adjustment is complete.
S
If the CO concentration is not within specification,
turn the idle mixture adjusting screw to obtain the
specified concentration value.
S
If the CO concentration cannot be corrected by ad-
justing the idle mixture, see table below for other
possible causes.
(e)
Reconnect the HAI vacuum hose.
6. TROUBLESHOOTING
CO
Problems
Causes
High
Rough idle
1 Restricted air filter
High
Rough idle
(Black smoke from exhaust)
1. Restricted air filter
2 Plugged PCV valve
(Black smoke from exhaust)
2. Plugged PCV valve
3 F lt
b
ti
3. Faulty carburetion:
S
Faulty choke action
y
S
Incorrect float settingg
S
Leaking needle or scat
Leaking needle or scat
S
Leaking power valve
CLICK HERE TO VIEW CHAPTER INDEX
Pages From Supplement
3RZ-F,3RZ-FE