Verify Shielded Wires

[3d914]

Rebuilt my custom harness at the two DIS connections where wires are supposed to be shielded. That was easy. However, been tracing shielded wires in the rest of my engine harness and wires the EVTM indicate should be shielded, aren't.

EVTM Ignition System (21-3 & 4)

• PCM #36,24,56,16 - wires shielded - Check (from 6" off PCM connector to 3" off C126)
• Crank Pos Sensor - 3 wires shielded - Check
• DIS - 4 wires shielded - Check for #4 (GY), #7 (O/R) & #2 (LB), but #5 (Y/LG) to SPOUT #1 (between C156 & C1034) is not shielded.

I checked another spare engine harness I have and it has the same "missing" shields on Y/LG wire between C126, C1034, & C156.

Is this typical? Why would it not follow the EVTM?

 

[Shovert]

I done some looking around for reason. Only thing I found is on the 2.3 turbo distributor type to prevent misfire from stray interfence. Since it uses eec-iv I assume for Dis same reason. Also it said to ground only on one end of shield wire to prevent ground loop. [? what that is] Maurice

 

[3d914]

I done some looking around for reason. Only thing I found is on the 2.3 turbo distributor type to prevent misfire from stray interfence. Since it uses eec-iv I assume for Dis same reason. Also it said to ground only on one end of shield wire to prevent ground loop. [? what that is] Maurice

Thanks Maurice. Did you notice on your harnesses if the Y/LG for the SPOUT #1 is shielded? I didn't go to the trouble of shielding it yet - just seems weird to have it that way in the EVTM then not build them accordingly.