Quote:

So, if you unplug the wires to the solenoid it smooths out?

If so that's eliminate the mechanics of the system and point to the control circuit.

Not sure if the EGR system is pulse width modulated or not, but that could account for the choppy vacuum reading you saw.

I don't believe there should be EGR at idle, I know on the older mechanical only systems there isn't. Might be time to crack open the FSM and read up on EGR operation.



I don't have a legit FSM. All I have is a chiltons and you can imagine how helpful the section about EGR was. Where can I get a FSM? Amazon only has a diesel one of the right vintage. I found it on another site but was listed for over $100. Screw that. And now my password for Mitchel on Demand, from the last shop I worked for, stopped working.

/Only thing that makes sense is a wire fault leading to a constant signal on to the EGR solenoid.
/I think the choppy vac signal is what the transducer does. IDk why. I though maybe someone would know.

Last edited by Instigate; 03/12/15 02:31 PM.