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I’m having an issue with the Vtec solenoid adapters on my newly purchased Civic LX (2005). Both adapter are missing and I need to know where to procure both of them without having to purchase the whole engine wiring harness. One is for oil and the other is for the rocker arms. Whoever messed with the Civic before completely removed both adapters from the solenoid to wherever they end.

 
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So... did someone on your 2005 LX do an engine swap? Is that what I'm to understand?

the 01-05 dx/lx never came with a VTEC engine otherwise

 
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I have removed everything but the solenoid and I have done a VIN check so that is how I believe it is still an LX. I have also run a diagnostics test but maybe that was false because it wasn’t connected but it did come up with an error code. I guess why would there be a solenoid on the engine without any connections? Would love to get to the bottom of this. Thanks for the reply.

 
Rep Power: 512

Check the actual engine stamp to see what engine you have. If the engine you have has a VTEC solenoid, someone did a swap.

This pic is from a B series, but the D17 has the engine stamp in the same spot


if it says D17A or D17A2, it's a 1.7L VTEC engine. If it says D17A1, it's a standard dx/lx non-vtec engine

 
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Yep you are correct it is a D17A2 engine. So that makes sense when I did the diagnostics it showed as a 2004 Honda Civic EX. So it looks like the Vtec Solenoid was disabled or never enabled because there are no adapters or holes coming out of the engine wiring harness. My next question is can I enable the solenoid so it works and does not continue to cause the engine to buckle at around 2700 rpms? If so, I don’t know where to find the wire adapters without purchasing the whole engine wiring harness. Where do the adapters (wires) end up?

 
Rep Power: 512

Either a VTEC controller or a D17A2 ECU swap. The latter would require immobilizer programming

 
Rep Power: 367

?
Are you having any check engine lights?
If it shows a VTEC related code, then whoever swapped the engine swapped the ECU already, so will need to connect the solenoid to it.
If it shows a non-VTEC code, you will need to pursue that code, not the VTEC. It most likely do not have a VTEC ECU (original LX ECU)

A VTEC engine will run without issues (aside from not being slightly peppier on higher RPM) using a non-VTEC ECU

The D17 uses the VTEC-E (Economy) version. One of the exhaust valves do not fully open at lower load/RPM. Higher loads/RPM, the VTEC will fully open the 4th valve. So, it's a 3 valve to 4 valve switch, not a cam profile change like the previous D-series engines.