Code 13 Keeps Triggering
Thread Starter
Intermediate
Joined: Jul 2015
Posts: 38
Likes: 0
Code 13 Keeps Triggering
Hello, I just recently picked up my 1st Corvette, an '87. My mechanic checked it out before I bought it and discovered it may need a, intake manifold gasket. The seller (car place across the street, we have a small town) agreed to repair it as part of the sale so I went with it.
Turns out it was a crack in the MAF housing.
Tooke the car home all fixed up and on came the service light a few days later. I pulled the code and it was a 13, O2 sensor circuit. Before bringing it back to my mechanic, I went and replaced the O2 sensor and all plugs. Ran awesome and still is, but after 15 minutes or so, the light pops back on. It will clear when the car is turned off and restarted but will come back on after about 5 minutes. Same code.
Where can I look next?? I believe the O2 signal could be symptom not the trouble but not sure. Dirty connector? MAF still no good?
Any ideas, please help.
Turns out it was a crack in the MAF housing.
Tooke the car home all fixed up and on came the service light a few days later. I pulled the code and it was a 13, O2 sensor circuit. Before bringing it back to my mechanic, I went and replaced the O2 sensor and all plugs. Ran awesome and still is, but after 15 minutes or so, the light pops back on. It will clear when the car is turned off and restarted but will come back on after about 5 minutes. Same code.
Where can I look next?? I believe the O2 signal could be symptom not the trouble but not sure. Dirty connector? MAF still no good?
Any ideas, please help.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
I had something similar happen on my 85. Just could not figure it out. Had my tuner (who is also an electrical engineer) trying to figure it out also. Replaced the O2 and it would throw the code in 5-10 minutes of driving. The O2 sensor is a single wire and one would assume that the ground is the exhaust pipe itself. Turns out there is a wire from the computer (mine was orange) that was the ground for the O2. It came from the computer and was grounded to the engine. I know doesn't make sense! We ended up testing it by running a temporary wire spliced into the old wire to a ground on the top of the block. Problem solved. We then installed the new wire permanently.
You might just check that out. You will have to do a search and find a drawing of the two plugs that go to your computer that lists what each wire is for. My drawing is for the 870 computer and yours should be different.
You might just check that out. You will have to do a search and find a drawing of the two plugs that go to your computer that lists what each wire is for. My drawing is for the 870 computer and yours should be different.
Last edited by John A. Marker; Jul 2, 2015 at 09:39 AM.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
If you can find the wire (assuming there is one for the 87) then just run a temporary ground and see what happens. We fastened mine to the bolt on the water neck on the thermostat.
Found it....just took a little searching.....
http://home.earthlink.net/~cliff_har...s/pinouts.html
Pin D6 TAN WIRE.
http://tpiparts.net/1227165_pinout_diagram
Found it....just took a little searching.....
http://home.earthlink.net/~cliff_har...s/pinouts.html
Pin D6 TAN WIRE.
http://tpiparts.net/1227165_pinout_diagram
Last edited by John A. Marker; Jul 2, 2015 at 10:07 AM.
Burning Brakes
Joined: Oct 2001
Posts: 911
Likes: 5
From: TN
1985 Code 13 fixed
Do not know how your 1987 is configured. My 1985 was giving me a intermittent Code 13 that I fixed. Replaced a temp sensor that screwed into the top of the EGR valve. This was many years ago, still no Code 13's.
