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CA18DET Over the Top Intake Manifold (CA16DE) Install (Part 3: Vacuum and Wiring)

Jul 23, 2008 Tech (CA18DET 240SX, S13)

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With the new manifold prepped and installed, you now need to install the vacuum lines and modify the E.F.I. slightly to relocate a couple of plugs. Specifically, the FICD, AAC, throttle valve switch and throttle sensor need to be moved. The FICD and AAC need to be relocated to the back of the intake manifold facing the firewall and the throttle plugs need to be moved to the center top of the new manifold. Instead of extending the wires, simply strip the covering from the harness using a razor or scissors and then pull desired plugs away from the bundle and bind them toward the back with electrical tape. Then re-wrap the harness and secure everything in place. The following gallery and captions shows the process from start to finish beginning with the vacuum lines.

Also, check out Project 240sx Overhaul Journal (Day 21) for pics of the charge pipe routing.

Once the new manifold is installed, route the BOV line and the brake booster line as indicated above.
Use the small nipple to route a vacuum line for the fuel pressure regulator.
Attach the air line from the charge pipe to the AAC, FICD assembly using a 3/8" hose. (This image also shows zip ties holding an already modified harness to the fuel rail.)

This diagram highlights the plugs that need to be moved. They are F14, F19, F23 and F24 on page 868 of the FSM.
Locate the indicated plugs and then carefully strip the wrap on the wiring harness.
Once stripped, pull the desired plugs away from the bundle and secure them to the back of the harness with electrical tape. You are effectively making a T so these plugs can route elsewhere.

Re-wrap the bundle using electrical tape and then install the harness. You can secure the harness with zip ties to the top of the fuel rail.

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This entry was posted on Wednesday, July 23rd, 2008 at 9:08 am and is filed under Tech (CA18DET 240SX, S13). You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

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