EL CAMINO Code 53, where to start to narrow down issue?

[78Delta88]

I tried late last night to find ohms value of the solenoid. Maybe someone has that, I was unable to locate. 87 and 88 I can't find the part you need, but try this.

Splice out the bad unit you have and splice in the 1989 unit. System should be similar...

Parts for the change is below.

Parts I pulled are from Auto Zone, Rock Auto and others have the same

 

[78Delta88]

The vacuum feed to the EGR is ported vacuum. The reason for this by using ported vacuum the EGR should only be working under cruise conditions and not at Idle. Injecting exhaust gas at startup and idle will make the engine run like crap.

With the change to computer control... The computer can read the O2 sensor and turn the EGR on or off based off of the O2 value present in the exhaust stream, i.e., NOx/SOx formation, as well as un-burned fuel.

Although this a bit of an extrapolation... If the solenoid is bad, resistance goes up, and maybe this is causing the higher voltage spike that the ECM is reading. So if you give the ECM something it can control maybe the issue will go away.

 

[78Delta88]

I talked with NAPA, they mentioned to take your suspected bad one to your local NAPA and they should be able to cross reference, through the Echlin line. I guess it's a fairly massive book, like the others they had no reference to the 87 year.

 

[schwim]

I talked with NAPA, they mentioned to take your suspected bad one to your local NAPA and they should be able to cross reference, through the Echlin line. I guess it's a fairly massive book, like the others they had no reference to the 87 year.

That's fantastic info, thanks so much, I'll take mine to them and see what they say.