Been getting an occasional check engine light on my 94 460 F250; code reader is bringing up 332 and 558. Insufficient EGR flow and EGR valve regulator solenoid circuit fault...so, where do I go from here?

Thx

 

The codes tell you the EGR regulator is bad giving you a low EGR flow. Either repair or replace the regulator solenoid circuit.

 

Thx Bear. So what needs to be replaced; vacuum solenoid, EGR valve
or both?

 

Well the solenoid controls the valve and it can't be made bad by the valve so I would start with the solenoid circuit and if that don't fix it change the EGR itself. Then again I don't know how you system is set up. My Crown Vic, the solenoid and the circuit are all one item, but I have seen them separate.

 

Can't find a part called a "solenoid circuit"...?

 

It is the electric component that is a vacuum valve between the EGR and it's vacuum source. My 1984 truck does not have one but my 1993 Crown Vic does as does my 1999 4.0L Ranger and is located right next to the EGR valve in both cases

 

Ok, thx...I'll take a look.

 

Hey Bear, sorry for just getting back....replaced the EGR vacuum solenoid. Haven't checked the codes yet but no, CEL so far.

 

CEL coming back on after acceleration. Codes same as before; 558, 332 except two new ones now 536 and 334. Anyone want to take a shot at deciphering the problem? All seem to be EGR related except 334, brake on/off circuit not activated during KOER. Thx

 

New EGR valve??

 

Vacuum leak??