egr problem

[wolfman]

the egr valve on my 86 442 dosnt operate at all,vacum line is good
does anyone know how this is controlled and by what part,

 

[DRIVEN]

Vacuum comes from base of the carb. Goes through an EGR solenoid controlled by ECM. Goes from solenoid to EGR valve. If you have a vacuum hand pump you can manually open the EGR. If the engine doesn't stumble when you apply vacuum to EGR at idle - suspect EGR. If the EGR valve does work check the function of the solenoid. Unplug the electrical connector and apply vacuum to the carb side. Use a jumper wire to activate solenoid. Vacuum should drop off. If it does - solenoid is OK. Next test wiring between ECM and solenoid. If wiring tests OK - suspect ECM.

 

[wolfman]

thanks
egr valve ok next i'll test solenoid operation