HOrnbrod Posted March 2, 2013 Share Posted March 2, 2013 Can someone with one of these vehicles either snap a pic or describe the O2 harness routing from the top of the engine cable run down to the O2 sensors? I wired the harnes down through one of the spaces between the intake manifold runners and even though it shielded, the heat from the intake manifold is frying the wires. I have to redo it and would like to know how the factory ran the wiring around or through the manifold. Thanks! Link to comment Share on other sites More sharing options...
Alexia Posted March 2, 2013 Share Posted March 2, 2013 This is all from memory, so no guarantee on accuracy. On federal emissions models the front O2 sensor runs down in front of the intake manifold behind the power steering bracket. Then it is held in place with a small sheet metal bracket that bolts to the oil pan bolts. From there it plugs into the sensor. On California emissions models the front upstream sensor runs between the 4 and 5 intake manifold runner. The connector for that sensor should be above the manifolds and the wires should have the heat shielding. If they do not have then pick some up at the an automotive store. The rear upstream sensor's connector clips to the same bracket that the CPS connector does and loops behind the intake manifold. While it should not need heat shielding putting some can fix that issue. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 2, 2013 Author Share Posted March 2, 2013 On federal emissions models the front O2 sensor runs down in front of the intake manifold behind the power steering bracket. Then it is held in place with a small sheet metal bracket that bolts to the oil pan bolts. From there it plugs into the sensor. Ah, that's the one I needed Alex. I just have one O2 sensor on the header. :bowdown: I was going to extend it and run it like that, and it's good to know that's how the factory did it for the upstream sensor. I do have thermal shielding and will wrap it too. Link to comment Share on other sites More sharing options...
Geonovast Posted March 2, 2013 Share Posted March 2, 2013 Don, if you end up still needing a picture, let me know. I'll go out and snap one for you. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 2, 2013 Author Share Posted March 2, 2013 Thanks Corry, I believe I'm good to go now. :thumbsup: Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 2, 2013 Author Share Posted March 2, 2013 Don, if you end up still needing a picture, let me know. I'll go out and snap one for you. Corry, I take that back. I have an 07 Wrangler PS pump with the 97 bracketry, and it would be very difficult to snake the O2 harness down the back of it. So if you could take a pic of the O2 harness routing when you get time I'd much appreciate it. It looks like I'll have to run it down between the intake manifold runners. Link to comment Share on other sites More sharing options...
mjeff87 Posted March 2, 2013 Share Posted March 2, 2013 Don't underestimate the powers of a zip tie Don.....I've got both my O2 and CPS tied to the axle vent tubing to keep them away from the header. Ghetto? Yes. Does it work tho? Yes :) Link to comment Share on other sites More sharing options...
Geonovast Posted March 2, 2013 Share Posted March 2, 2013 Runs along the bottom of the block from the sensor, looks like it's clipped to the block twice; Then comes back up around the manifold and meets up with the CTS plug wires. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 2, 2013 Author Share Posted March 2, 2013 Hey Jeff, I'm a big zip tie fan for sure. With careful use, you can make any sloppy wiring job look good. Runs along the bottom of the block from the sensor, looks like it's clipped to the block twice; then comes back up around the manifold and meets up with the CTS plug wires. Perfect. That's how I'll do. The factory wiring isn't even shielded (except by plastic) and goes right across the top of the manifold. But since I have some thermal tubing I'll shield it. Thanks Corry. :cheers: Link to comment Share on other sites More sharing options...
Alexia Posted March 3, 2013 Share Posted March 3, 2013 Definitely do not take my advice about routing it behind the power steering pump bracket. Glad this made me go out there to take a picture or otherwise I would not have noticed this before it got worse. What Geonovast shows is correct for routing. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 3, 2013 Author Share Posted March 3, 2013 :eek: :eek: Glad this thread helped you too Alex. Mine is pretty bad but not that bad. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 9, 2013 Author Share Posted March 9, 2013 No more fried O2 harness. Thermal shielding and cable clamps underneath. Thanks again for the pics Corry and Alex. :cheers: Link to comment Share on other sites More sharing options...
earl*t Posted March 9, 2013 Share Posted March 9, 2013 That has got to be one of the nastiest engine bays I've ever seen. :thumbsup: Link to comment Share on other sites More sharing options...
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