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1990 Corvette shutting off while driving

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

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SOURCE: 1981 corvette blower motor getting

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

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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

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SOURCE: trying to find my EST connector in my 1980 corvette.

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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Posted on Aug 31, 2009

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SOURCE: where do you connect the jumper wire on a 1994 corvette blower wiring harness

unplug blower run hot wire to blower see if it works if does it resistor nif not it blower

Posted on Sep 06, 2012

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1990 corvette engine races and takes off when brake pedal is depressed. Happen in drive and reverse. Getting scary.

Hi Jackie , It doesn't have to have a code stored in the ECM memory for a problem too exist . need some more info from your if you would like some ideas as to the problem !
What engine does yours have ? 5.7L ? What type fuel system does it have - TBI - throttle body fuel injection ? I had vehicles at the Chevy dealer I worked at with this type fuel injection , where the engine raced really fast . Vacuum leaks , bad plug wires can cause this problem . The engine computer is compensating for more air entering the engine ! After fixing the problem it still was racing , you have to drive the vehicle an get the speed up over 35 MPH for the ECM to reset !

Jul 21, 2015 | 1990 Chevrolet Corvette

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My 1990 corvette was running then I took it to a mechanic for a tune up and oil change he Put it on the hoist and now my corvette does not start no more.

Does the vehicle crank and not start? Your mechanic must re check his work then inspect battery, spark, fuel pressure 30psi min,and computer codes. Good luck and always have your mechanic test drive vehicle to confirm repair.

I’m happy to assist further over the phone at

Jan 05, 2015 | 1990 Chevrolet Corvette

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1990 corvette rearview mirror light stays on

Check switches at door jams looks like a black button they wear out since its just a basic contact switch just remove the switch from the door jam remove the two wires ( some are hardwired to the switch if so you will have to snip the wires if not just disconnect the plug) now twist the wires together or use a small piece of wire to short the plug. This will shut off the light assuming that there is no short in the switch wiring and the switch on the other side of vehicle is functional

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There should be a connector under the dash - you can use a scanner for OBD I or a jumper wire to make the check engine light flash.

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Jan 15, 2010 | 1998 Chevrolet Corvette

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Ehgin running rough

You got a check engine light viewing. If so get the shop manual make youself a jumper wire and jump the terminals it tells you to jump and count the flashes for the codes. The ECU/ Brain terminal is under the ash tray. If there are no codes or a check engine light welcome to the wondeful world of being a Corvette owner I 've owned the same car since 1981.
Basically, check the idle,you may want to replace wires, Distributor cap and rotor. Thats worked for me in the past. Once the PCV valve was stuck. Pull it out and shake it if it rattles its fine. You can blow thre it to has to accept air one way but not the other. The shop manual will tell you to do the same.I believe they may go a step further and recommend an oil change and minor cleaning of the carb. I use mine for shows and because I don't run it regularily I get the same problem. I usually let it run for a few hours (ideling of course) lol... and it works itself out . Keep me posted

Sep 19, 2009 | 1992 Chevrolet Corvette

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90 corvette with 22,000 miles running very rough and back firing

Well it sounds like you've started to do your "due diligence", but there are several things left out. Your problem could be many things. Something as minor as a vacuum hose left off, loose, or in the wrong place. And just because you changed the plugs and wires, don't mean you fixed your problem. Open your hood at night and see if you have any sparks "dancing" around. Another way to check this is to open your hood and spray a soapy water solution on your plug wires and look for sparks jumping around. If so replace your wires. You didn't mention what type of wires and plugs you used. I would reccommend NKG platnum plugs and a Bosch wire. I know this from experience,(the hard way teacher). It could even be the gas you are burning. I've owned a lot of Vettes, and I am the kind of guy who believes they should be driven. If not it's like having a beatiful wife and never taking her to bed.I know a lot of people who only drive them "once in awhile". Sitting in thier garage can cause many fuel problems, condensation, sludge in the carb, or filters etc. This can all lead to the problem you are describing.
Low speed miss- usually plugs
High speed miss- usually wires or valves
intermitten miss, fuel or electrical.
I hope I gave you some places to look to find your problem.

Jul 07, 2009 | 1990 Chevrolet Corvette

1 Answer

1990 vette runs fine after 15-20 min won't start then wait 20 -min runs fine again until i shut it off

I had the same problem. Turns out,( and I didn't believe it when I was told) but, my problem turned out to be cheap (inferiour) plugs and wired. I was reccomended to use NKG plugs and Borg-Warner wires.

May 31, 2009 | 1990 Chevrolet Corvette

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