Да, промывать периодически надо. Место не самое удачное.
Для тех, кто хочет знать какие провода за что отвечают.
A- WHITE wire. ECM control of Ignition Control Module (after the 400 RPMs and above are achieved).
B- TAN with BLACK stripe wire. 5 Volt BYPASS from ECM for Ignition Timing Control.
C- LIGHT BLUE with BLACK stripe wire. CRANK Position Signal to ECM.
D- PURPLE with WHITE stripe wire. Fuel Injection Control Signal to ECM.
E- WHITE wire. Instrument Panel Tachometer Signal.
F- BLACK wire. CAM signal from the camshaft position (CMP) Sensor.
G- YELLOW wire. CRANK (18X CKP) Signal from Crankshaft Position Sensor Assembly.
H- LIGHT BLUE with WHITE wire. SYNC (3X CKP) Signal from Crankshaft Position Sensor Assembly.
J- BROWN with WHITE stripe wire. CAM Signal from Camshaft Position (CMP) sensor.
K- BLACK with WHITE stripe wire. Engine Ground (-).
L- BLACK with RED stripe wire. Ground that ECM gets thru' the ignition control module.
M- RED with BLACK stripe wire. CAM and CRANK Position Sensor Ground (-).
N- WHITE with BLACK stripe wire. 12 Volts to CAM and CRANK Position Sensors.
P- PINK wire. Fused 12 Volts power for Ignition Control Module.
Ну и "ду ит ёселф" статьи по мотору.
https://easyautodiagnostics.com/gm/3.8L/index-of-articles-1