engine runs perfect. no misfiring at all?>??????
the computer dont know,
all it knows, is a reading fails.
in electroncs we do more testing
it can be bad wires. bad connections or bad sensors.
we use a voltmeter do check this, or a scope if fast moving signal.
1991 2.8L
"Electronic Spark Timing Circuit
Specific to 1992-93 models only.
Indicates that the ECM believes the Ignition Module has failed.
Check the wires and connectors between the Distributor and the ECM."
google finds top anwser here
https://www.2carpros.com/questions/isuzu-trooper-1992-isuzu-trooper-code-42--2
best answer ive ever seen, and for old cars, had to find,
most folks long forgot ..24 years ago
and books long ago in land fill....
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