engine comparment harness availability?
Thread Starter
Heel & Toe
Joined: Jul 2010
Posts: 18
Likes: 0
engine comparment harness availability?
Hey guys my 87 coupe auto. Keeps throwing a mass airflow circuit code over and over. I've replaced the sensor twice and checked the harness. It seems there is some sort of short in the harness itself and I have inspected other areas of the harness and found numerous cracks, breaks, bare spots, and questionable repairs. I have made countless searches on the internet to no avail. I know of the one painless makes but I called and they told me it will not work with the vette computer. Does anybody know where I can get a new one? I can work with used but I'd guess they would be in a sad state like mine. My car is my daily driver now so I need to find one before I have a fire. Thanks for your help guys. Yall always come through.
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Try Jim at www.jimsperformance.com he does harness repairs and reworks. He's in Ellicott City Md. specializes in GM fuel injection stuff. Pipe
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The new harnesses were discontinued long ago. From what I've seen, you'll pay between $500 and $1000 for a used harness. Seems like a lot to fix one wire.
Which code are you getting? The ECM only tests the MAF during burnoff when you shut off the ignition. The only possibilities are:
Code 33: MAF sensor high - which means bad MAF or open in the wiring.
Code 34: MAF sensor low - which means bad MAF or short in the wiring.
My advice is to replace the MAF relays before you do anything else. Mounted on the firewall right behind the battery. They're less than $20 each.
Which code are you getting? The ECM only tests the MAF during burnoff when you shut off the ignition. The only possibilities are:
Code 33: MAF sensor high - which means bad MAF or open in the wiring.
Code 34: MAF sensor low - which means bad MAF or short in the wiring.
My advice is to replace the MAF relays before you do anything else. Mounted on the firewall right behind the battery. They're less than $20 each.
Tech Contributor
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
One for sale in used parts section right now for $75
http://forums.corvetteforum.com/c4-p...s-shippin.html
For an auto car.
http://forums.corvetteforum.com/c4-p...s-shippin.html
For an auto car.
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
Its not that difficult to "build" a harness....
If you can find the correct new plugs and most are available, take the old harness off and lay it out on a sheet of plywood and draw the wires and note the color and positions. Use old harness for reference.
Lay new wire in same place and make the plugs/connectors. Install.
hardest part is finding the right wire colors, stripes. There ARE bundled wire harness available that are all black with each wire numbered with a white number stamp every 6" so its easy to relate a color to a number. Just don;t loose the crossover code list that you'll have to have from then on.....
blue =1
orange =3
brown/wht strip =17
etc..... it can be done.
Look at Flea-Bay for used harness that can be had that may need some minor repair. If the main trunk is in good shape the branches can be repaired/replaced as needed by soldering in new pieces. This would be THE time to locate the factory splices and SOLDER them in place instead of the factory black tape..
If you can find the correct new plugs and most are available, take the old harness off and lay it out on a sheet of plywood and draw the wires and note the color and positions. Use old harness for reference.
Lay new wire in same place and make the plugs/connectors. Install.
hardest part is finding the right wire colors, stripes. There ARE bundled wire harness available that are all black with each wire numbered with a white number stamp every 6" so its easy to relate a color to a number. Just don;t loose the crossover code list that you'll have to have from then on.....
blue =1
orange =3
brown/wht strip =17
etc..... it can be done.
Look at Flea-Bay for used harness that can be had that may need some minor repair. If the main trunk is in good shape the branches can be repaired/replaced as needed by soldering in new pieces. This would be THE time to locate the factory splices and SOLDER them in place instead of the factory black tape..
Last edited by leesvet; Sep 19, 2011 at 01:30 PM.
Thread Starter
Heel & Toe
Joined: Jul 2010
Posts: 18
Likes: 0
The new harnesses were discontinued long ago. From what I've seen, you'll pay between $500 and $1000 for a used harness. Seems like a lot to fix one wire.
Which code are you getting? The ECM only tests the MAF during burnoff when you shut off the ignition. The only possibilities are:
Code 33: MAF sensor high - which means bad MAF or open in the wiring.
Code 34: MAF sensor low - which means bad MAF or short in the wiring.
My advice is to replace the MAF relays before you do anything else. Mounted on the firewall right behind the battery. They're less than $20 each.
Which code are you getting? The ECM only tests the MAF during burnoff when you shut off the ignition. The only possibilities are:
Code 33: MAF sensor high - which means bad MAF or open in the wiring.
Code 34: MAF sensor low - which means bad MAF or short in the wiring.
My advice is to replace the MAF relays before you do anything else. Mounted on the firewall right behind the battery. They're less than $20 each.
Thread Starter
Heel & Toe
Joined: Jul 2010
Posts: 18
Likes: 0
One for sale in used parts section right now for $75
http://forums.corvetteforum.com/c4-p...s-shippin.html
For an auto car.
http://forums.corvetteforum.com/c4-p...s-shippin.html
For an auto car.
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