1989 Corvette Code 42
Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
1989 Corvette Code 42
Hi, My corvette has had this problem for a while now. when you really get on it it tends to miss really bad, so this weekend I hooked it up to my computer and noticed I am getting code 42 (EST monitor error). The corvette does have a hypertech chip (which was there when I bought the car) and I did notice the little cable that goes to the coolant temp. sensor was knocked loose, so I hooked it back up and re-hooked the Vette up to the computer and I still get code 42. Should I just need to reset the computer after I hooked the temp sensor back up if so how do I reset the computer. Help me get this Vette back on the road!! Thanks!
Team Owner
Joined: Jan 2003
Posts: 20,320
Likes: 248
From: Summerland B.C. Canada
Disconnect the neg battery terminal for a minute, that will clear the code.
That code pops up when the EST bypass connector is unplugged for engine timing.
Have you set the timing lately ?
http://members.shaw.ca/corvette86/Code%2042.pdf
That code pops up when the EST bypass connector is unplugged for engine timing.
Have you set the timing lately ?
http://members.shaw.ca/corvette86/Code%2042.pdf
Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
Disconnect the neg battery terminal for a minute, that will clear the code.
That code pops up when the EST bypass connector is unplugged for engine timing.
Have you set the timing lately ?
http://members.shaw.ca/corvette86/Code%2042.pdf
That code pops up when the EST bypass connector is unplugged for engine timing.
Have you set the timing lately ?
http://members.shaw.ca/corvette86/Code%2042.pdf
do you now where the cable is located so I can check to make sure it is hooked up, thanks!!
Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
Never mind, I rehooked the temp sensor at the bottom of the block and cleared the code like you said by disconnecting the negative terminal for the battery and I hooked everything back up and to the computer, and no code! could that really have been all my problems? amazing what 5 minutes of research and 10 minutes of work can do.
Last edited by C4 Monster; Sep 13, 2010 at 05:22 PM.
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Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
Team Owner
Joined: Jan 2003
Posts: 20,320
Likes: 248
From: Summerland B.C. Canada
Maybe the previous owner never cleared the code after setting the timing.
Check to see if the code comes back, after your next drive.
Thread Starter
Instructor
Joined: Dec 2009
Posts: 236
Likes: 0
From: Houston Texas
Ah, that would be the cylinder head, drivers side holds booster fan temp switch, passenger side holds temp gauge sender. Neither would trigger a code.
Maybe the previous owner never cleared the code after setting the timing.
Check to see if the code comes back, after your next drive.
Maybe the previous owner never cleared the code after setting the timing.
Check to see if the code comes back, after your next drive.
