D21 Hardbody 2WD L4-2389cc 2.4L SOHC MFI (KA24E) (1990)
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Clear any codes and test drive under the following conditions:
Driving Mode:
1. Start engine and let it warm up sufficiently.
2. Idle at least 40 seconds.
3. Drive under the following conditions for at least 5 seconds.
^
Engine speed: 2000 to 2400 rpm.
^
Intake manifold vacuum 9 to 14 inHg.
4. Turn OFF the engine and wait for at least 10 seconds.
5. Repeat steps 2 through 4 at least 5 times.
NOTE:
IF THE ALPHA READING IS NOT BETWEEN 95-105% REPEAT ALL STEPS--YOU MIGHT HAVE MISSED SOMETHING.
FINAL TEST ALPHA (@2000 RPM):
REMEMBER:
IF AN INJECTOR LEAK WAS FOUND, REPLACE THE ENGINE OIL AND OIL FILTER.