Question about 1990 Chevrolet Corvette
How do I fix these two codes? I have a 1990 Corvette. I pulled the codes using a jumper wire and I am getting two codes. 42 EST System Error and 51 MEM-Cal Error.
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Posted on Jan 02, 2017
Check the blower speed control resistor pack, it is located in the air stream near the blower motor, that is most likely the cause of the inop blower, but be warned if the blower is drawing to much current due to wear the resistor will fail again, I believe the connector has four wires, 2 are heavy Gage
Posted on Jul 29, 2008
Check to see if the brown and black strip wire is dissconnected by the fuel pump relay if not try dissconnecting the battery for a minute and see if the light comes back on.
Posted on Feb 21, 2009
If you have this engine option, you'll have a MAP sensor, a TPS and an O2 so it should be pretty easy to confirm this option. The EST wire should come out of the distributor, you can follow it from there to the connector. All of this aside, my favorite way to time one of these with any system, is to get an advance timing light, dial up 42 degrees, bring the engine up to 3200 rpm, and twist the distributor until you see TDC line up at the 0 mark on the timing cover. Now you know you have 42 degrees advance "all in" at 3200 rpm and you can go back and check your idle advance to determine if something is hanging up in the system.
Posted on Apr 01, 2009
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