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Discussion Starter #1
In the 70's and 80's cars, the EGR was controlled only with coolant temperature.

On our cars, there is a modulator that gets signals from multiple sources.#1 is the coolant temperature.
I have forgotten so much in the last DECADE.

Vacuum and pressure from the exhaust manifold pressure. and the intake vacuum.
An over-active EGR will cause a lean condition=surging.
I cannot get this explanation per the TSRM.
I have NO vacuum signal TO the EGR component.

Nor have I verified that the EGR opens and closes when vacuum is applied to it's port. It has been replaced and was functioning a few years back. (y)
There is a reason that the Japanese engineers included a modulator.:censored:


Location of the EGR "cooler"?

I understand this diagnostic tree.
This one as well:

It has been a while that I tested the coolant temp sensor.
It's VERY common to see corrosion at the terminals! Dielectric grease is indicated, there.
 

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Discussion Starter #2
My screwed up LIFE gets in the way from my Supra!!!! Too many house projects and other BS issues!
I'll get to it.
I cannot easily work on my car or my house.
I'm a frikken' careless bastard.
 

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Sharp object BAD!!
 
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