Help please!!!
cajunboyla
08-11-2010, 01:49 PM
My 84 vette "check engine" light is on. I ran a diagnosis and got the code 42 error for the EST and the ECM. I've changed the EST(SPARK MODULE) and still has the error message. Should I change the ECM(CONTROL MODULE) as well to clear the message? :disappoin :frown:
oldblu65
08-11-2010, 09:09 PM
Cajun , try going to http://www.troublecodes.net/articles/gmmsundrstd42.shtml
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