This is on a 2008 Chevy Impala, 3.5L V6, non-flexfuel. Recently got cylinder 1 misfire / ignition failure codes. An investigation revealed that mice had gotten into my garage, made themselves at home under the lower intake manifold, and chewed the wires going to the cylinder 1 fuel injector to pieces. The rest of the injectors are fine.
If this were some other kind of electronic device I wouldn't hesitate to cut out the bad portion, solder in a new bit of wire, and close up it all up with shrink-wrap... but I'm not 100% certain this would be a good idea in this situation. So my questions are:
- Can I patch in new wires to replace the part that has been ruined, or should I replace the entire wiring harness? (there is still enough good wire between the connector and where the wire branches off from the main harness that I think I could do it)
- If I can, do I need to make special allowances for the potentially high-heat environment? Do I need wires with heat-resistant insulation? Should I avoid shrink wrap? Use different electrical tape (or no tape)?
- Do I need to replace the upper intake manifold gaskets while I'm there? The car has about 95K on it and the gaskets look like they're in good condition (no idea if they've ever been done), but maybe it's a good idea to replace since I've gone through the effort of removing the manifold?
- Any other gaskets, o-rings, etc, that I should look at or replace while I've got the top off?
- I'm having a heck of a time disconnecting the wiring from the injector. Is there a trick I'm missing?