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Originally Posted by jsp
Sorry to revive an old thread, but could you confirm something for me?
Does this mean that both coolant sensor and the piggyback valve are entirely unnecessary without the egr? I wish there was a nice picture like the one posted by Dave M. Has anyone done something this to their 83 or 84 300D-T, and would like to post pictures for the benefit of others?
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That is correct. Just be careful that the piggyback valve is only for the EGR. On some engines, there were two valves, and one controlled the EGR and the other was transmission vacuum related. It all depends on which vehicle you have. "Most vehicles" use those piggyback valves simply to regulate EGR.
Just track the hoses and see if they end up at the EGR valve. If so, then the piggyback valve is not required.