EEC-IV
Cylinder Balance Testing Procedures
After you have performed the KOER test
and corrected any problems you may now perform the EEC-IV Cylinder Balance
test. This test checks all the cylinders in the engine for matched
compression ratios. The Cylinder Balance test is designed to help isolate
cylinders that have low compression ratios with respect to the others in
the engine. This test is performed immediately after the KOER test
has finished displaying codes.
To perform this test, the EEC-IV will bring
the idle of the engine up to about 1,000 RPM. Once the idle has stabilized
it will then shut off spark and fuel to one cylinder, during this time
the decrease in RPM will be measured. The EEC-IV will then activate fuel
and spark to the cylinder being tested, and will wait for several seconds
until the idle stabilizes again. At this time it will repeat the
process for the next cylinder, repeating until all have been tested.
The results of the test will then output one or more of the following codes
to your reader:
-
10 - Number 1 Cylinder Low
-
20 - Number 2 Cylinder Low
-
30 - Number 3 Cylinder Low
-
40 - Number 4 Cylinder Low
-
50 - Number 5 Cylinder Low
-
60 - Number 6 Cylinder Low
-
70 - Number 7 Cylinder Low
-
80 - Number 8 Cylinder Low
-
90 - Passed Cylinder Balance Test
After the first cycle of the Cylinder Balance
test the EEC-IV will then perfrom the Cylinder Balance test again. The
test will continue to cycle at twice the threshold of the previous test
until the engine is shut off. Each time the EEC-IV finishes
a Cylinder Balance test cycle it will display codes to your reader.
The following instructions will walk you
through the procedures for performing the EEC-IV Cylinder Balance test.
-
Make certain that you have completed both
the KOEO and KOER tests and have corrected any errors encountered during
those tests to make certain that the Cylinder Balance test results will
be accurate.
-
After performing the KOER test wait for the
EEC-IV to finish displaying codes to your reader, do not shut the engine
off!
-
Briefly depress the accelerator to WOT.
-
Write down any codes output by the Cylinder
Balance test.
-
Wait for the EEC-IV to perform the next cycle
of the Cylinder Balance test.
-
When you are through simply turn the engine
off.
While the EEC-IV Cylinder Balance test is
not a substitute for a compression check, it can help you determine where
to start looking when diagnosing a rough running engine. It may also
help to pin point impending engine problems.
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