EGR bleed solenoid

Trucksareforwork · Mar 14, 2023

Maybe there are different kinds, but the egr bleed solenoid on my 85 305 w 700r4 activates when tcc is locked and bleeds vacuum off the EGR. It doesn’t add vacuum it releases it.

This was done (to my knowledge) to allow for a slightly richer mix when the converter is locked to avoid pinging when in low RPM / lean mixture / high vacuum situations. Deactivating EGR during this scenario allows for richer fuel / air mix.

Mine looks like the one posted from Amazon, not like the original poster’s.

Ricko1966 · Mar 14, 2023

@Trucksareforwork you are right. I learned some thing today ,thank you, I only knew of pulse width modulated ones but turns out there are some that are just on off. It didn't even click in my brain these trucks are dinosaurs,not state of the art. you are correct this application it is an on/off, it kills the egr signal when the torque converter is locked.

Trucksareforwork · Mar 14, 2023

Tried to find a pic of mine on my phone and this is best I can do.

The solenoid has a pigtail on back and two vacuum inlets. One side goes to the back of the carb (just a dump to atmosphere on the q jet) and the other is fed by ported vacuum from a tvs in a stock config.

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My truck’s vac diagram shows how it’s set up on the vacuum side.

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I think this was just another band aid to help with the significant ping/detonation issues the 305 has.

EGR bleed solenoid

Trucksareforwork

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Ricko1966

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