1950-1966 [Subscribe to Daily Digest] |
In the non-turbo 99's there is a large cluster of wiring that runs over the flywheel cover and splits off to various sensors, etc. On the Turbo's this section of the harness is made longer and runs forward, crosses under the radiator and then goes over to the engine. The reason for this is that the temperatures around the turbo are extremely hot and would melt the insulation. It's possible that you might be able to protect the wires by wrapping them in a heat shield, but I wouldn't risk it myself. I'd splice some extensions into the harness. This is not an easy job, but it is necessary. New shrink tubing can be found at electronics suppliers. J.C. Whitney also has it in various diameters in 3' lengths and in spools. Shrink tubing is necessary, because you are more likely to have wiring trouble if they're not wrapped into bundles. There is nothing that bugs me more than following behind someone else's sloppy wiring job.
I'm not sure about the 900 system, but on the lambda equipped 99's, the harness for the CIS system and the lambda control system is a seperate harness. It is one continuous wire bundle from the engine sensors to the lambda box under the passenger's seat. NEVER CUT THE GREEN OXYGEN SENSOR WIRE IN THIS HARNESS. It is not just a stranded wire, but a shielded coaxial wire. It is extremely small and not easily replaced. It is possible to lengthen the forward end of this harness without cutting into the oxygen sensor wire.
An alternative to putting the lambda control system and wiring in, is to find a harness from a '75-'77 99 with CIS. There is no need to route the harness through the firewall. Someone butchered the lambda harness on my friend Dave's '78 99EMS and he is retro fitting an earlier harness and a point type distributor with a Pertronix kit.
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