ECM codes - Team Camaro Tech
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post #1 of 4 (permalink) Old May 27th, 01, 06:31 PM Thread Starter
Join Date: May 2001
Location: copperas cove tx
Posts: 1

I have a 83 z28 that keeps giving me code 42.I looked up the code and it says EST Electronic spark timming. It all began with the engine surging at idle. If u can help me please let me know.

thank you
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post #2 of 4 (permalink) Old May 27th, 01, 06:51 PM
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Join Date: May 2001
Location: Houston, Texas
Posts: 4,491

Well, without a scanner, i'd say replace the ignition module in the distributor. It's either that, the wiring to the module or the ECM itself.
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post #3 of 4 (permalink) Old May 28th, 01, 03:19 PM
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Join Date: Jan 2001
Location: conway s.c.
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have you checked your timing, if it is not set properly or distributor is loose you will get surging at idle and a code 42. this is to let you know that the electronic spark control module is causing your timing to advance or retard too much. Put a timing light on it and check that.
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post #4 of 4 (permalink) Old May 30th, 01, 12:27 PM
Join Date: Apr 2001
Posts: 26

Actually, the code 42 indicates that the ECM does not have control of the timing when it should. It is likely the module. Ray
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