Got it figured out…I think. The cars not running, 02 sensor was my first thought but the connectors diff (male vs female). I didn’t realize the cmvc plates plugged in (don’t really understand them to be honest) so I started looking for more plugs…found one tucked under the intake with reeeally bright flashlight!! It was for the 2 sensors that bolt into the top of the block.
I’m worried now though, I assumed all those connectors would only plug into certain other connectors. There’s about 4 different types of those connectors back there, wondering if it’s possible to plug into the wrong ones..?
I’m about to start my new motor, gotta get tune info to Lito. The motor was rebuilt over a year ago with new components minus the block and crank. Do I need to do anything or can I just starting cranking on her? I have the plugs out currently, thought about spraying some WD40 down the holes, turning off the fuel system (return setup on switches), prob disconnect injector harness…..I dunno what’s best?
Hi Hollowdweller,
Check the back side of this plug (the white end where the harness wiring is terminated) for the harness wire color to be able to ID their use as follows:
Knock Sensors:
YE-RD (yellow w\ red stripe)
YE (solid yellow)
DG-VT (dark green w\ violet stripe)
DG-WHT (dark green w\ white stripe)
IMRC (CMCV):
RD-YE (red w\ yellow stripe)
DB-YE (dark brown w\ yellow stripe)
BLK-WHT (black w\ white stripe)
The harness & component plugs for these are identical in design & both have 4 wire terminals but the IMRC (CMCV) plug only uses 3 of the 4 terminals.
If your OEM IM still has the CMCV actuator installed & hooked up to the IM runner shafts, then you'll need to plug the CMCV actuator back up (CMCV Actuator rests in the CMCV closed position--default position when no GRD is pulled from the ECU--PWM actuated system. This will cause a massive restriction at mid-range to high RPM operations if ECU can't open them up when it calls for them to be fully opened.......should also set a DTC & light up the MIL if the ECU can't open them) or like a lot of folks have done.......delete them.
If the knock sensors aren't hooked up, then I don't need to tell you what this can cause, but if the ECU doesn't\can't detect any voltage from the KS's (KS's self-generate their own low-level AC voltage thus the ECU will be looking for this voltage to show up) this WILL set a DTC & light up the MIL.
So, in short in the end, the ECU will kinda let you know which connector this is as well..........
From my recall, this is most likely the plug to the CMCV actuator (as already mentioned).
Hope this helps you out.
