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HI I GOT A PROBLEM WITH MY 87 GN I GET A CODE 13 WHICH IS OXYGEN SENSOR SENSOR CIRCUIT IS OPEN. I CHECK FOR CONTINUITY AT THE TAN WIRE OF THE O2 SENSOR IN THE PCM WHICH IS THE GROUND WIRE AND I FOUND OUT THAT THE CIRCUIT IS OPEN WELL I RAN A NEW WIRE TO A NEW GROUND FROM THE TAN WIRE OF THE PCM AND I CHECK FOR CONTINUITY AT THE WIRE AGAIN AND ITS STILL OPEN WHICH I DONT KNOW WHY AND I CHECK THE OTHER GROUNG WIRES AT THE PCM AND THEY ARE ALL OPEN.. SO DOES ANYONE KNOW WHAT THIS CAN BE I CHECK THE GROUND STRAP AND ITS GOOD. ANY OTHER IDEAS ?
 

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check the grounds wires mounted on the passenger head between head and firewall. They are usually dirty or broken. A cure is swapping the rear intake bolt with the front intake stud(engine lift hook) Then mount all the grounds on the back of the intake manifold.

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ED BAKER
87-T-TYPE, T49,Bluetops,MM210Roller,JE forged20over,P&P Heads,Manley valves,Hemco 65mm& Acu65TB,V2 FM, P.I.9.5 -7disc,Jimmys Trans, new times soon.
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