1987 C4, Momentary SES light, 7 trouble codes??

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Jan 27, 2016 | 09:13 PM

TheDrewster

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8th Gear

Joined: Aug 2015

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From: Reno NV

1987 C4, Momentary SES light, 7 trouble codes??

Yesterday, I took the Vette to work and it drove totally fine in the morning. Went to lunch, started the car, then out of the corner of my eye, I see the Service Engine Soon light illuminated. Seeing as how I just had the oil changed and the transmission fluid changed the day before, I begin to worry. The car still seemed to drive totally fine, so I forego the trip to Burger King and instead go to O'Reillys where they have an OBD1 scanner. The dude hooks it up and says "yeah its not connecting, dunno man." So I get back in the car, start it up, and the SES light is gone. Huh. Weird. Car drives home totally fine.

So fast forward to today, I take the car out for a drive and no SES light, no problems. So I stop into a different O'Reillys and get someone who at least appears to know what he's doing. He pulls 7 codes in this order:

51: PROM- Memory fault
44: Lean Exhaust
41: Cylinder Select Error
63: ?
61: ?
54: Fuel Pump Circuit voltage low
52: Oil Temp sensor low

Could a vehicle possibly have 7 error codes and drive totally fine without SES? Could there be a single global issue causing this many codes? Or are all these codes erroneous? I am concerned, and REALLY don't want to take it to the dealership.

Jan 27, 2016 | 09:52 PM

antfarmer2

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Joined: Mar 2015

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how is your battery I would get a load test. and clean the connections.

Last edited by antfarmer2; Jan 27, 2016 at 09:55 PM.

Jan 28, 2016 | 12:53 AM

xrav22

Drifting

Joined: Mar 2013

Posts: 1,952

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From: Venice Cali.

Use the paperclip method to pull codes not Orielys.
They seemed to be really accurate to me helped me fix everything.
Good luck a search should find out how.

Jan 28, 2016 | 01:06 AM

Cliff Harris

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Joined: Apr 2002

Posts: 10,036

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From: Anaheim CA

Any time you have that many codes it's usually because you're not retrieving the codes correctly. A bad parameter template will do that. If you don't use a template that matches your car you will get bogus error codes. For example, your oil temperature sensor does not connect to the ECM, so that error is not applicable.

Pull the codes yourself:

https://www.corvetteforum.com/forums...post1574918379
http://corvettephotographs.com/c4vettes/codes.htm

What they mean (use this chart, as others are not year specific and result in bad diagnosis):

https://www.corvetteforum.com/forums...post1576116036

Last edited by Cliff Harris; Jan 28, 2016 at 01:08 AM.

Jan 28, 2016 | 05:25 PM

TheDrewster

Thread Starter

8th Gear

Joined: Aug 2015

Posts: 8

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From: Reno NV

So I pulled the code myself by shorting the A and B contacts, and turns out I only have 1 code, 32 for the EGR system. Ill have to look into that further. What a relief!

Jan 28, 2016 | 08:53 PM

xrav22

Drifting

Joined: Mar 2013

Posts: 1,952

Likes: 239

From: Venice Cali.

Quote:

Originally Posted by TheDrewster

So I pulled the code myself by shorting the A and B contacts, and turns out I only have 1 code, 32 for the EGR system. Ill have to look into that further. What a relief!

Hey there clean the connector check vacume lines/wires for breakage good and undo the negative battery cable to clear codes then try it again.

See if it comes back.
Note when undoing the battery cables multiple times be carefull to not strip or overtighten your connectors. However I hear there is a wire you can unplug and plug back to do the same thing but I have never been able to do it that way with success.
Good luck on the right track

Jan 28, 2016 | 10:44 PM

jv9999

Melting Slicks

Joined: Jan 2014

Posts: 2,192

Likes: 381

From: Lunenburg MA

Quote:

Originally Posted by TheDrewster

So I pulled the code myself by shorting the A and B contacts, and turns out I only have 1 code, 32 for the EGR system. Ill have to look into that further. What a relief!

There is a temperature switch on the pipe that feeds the EGR valve from the exhaust manifold (by the heater box). When the ECM commands the EGR on it looks for this switch to close indicating exhaust gas is flowing.
Code 32 is caused by this switch either not closing when it should or being closed when no EGR is requested. Hope this helps and happy hunting.