[Diy_efi] Exhaust manifold pressure sensors

[Bill Shaw]

Yes,  the '91 Ford Tempo (among others) uses a differential pressure
transducer across the EGR valve to detect failure of the valve.  They use a
10" (approx) silicon tube between the exhaust manifold and the sensor.

Bill

> From: "Van Setten, Tim @ ACSSD" <tim.van.setten at L-3com.com>
> 
> A two foot length of 1/8 inch tube should be enough to protect a sensor.
> Using a GM 3-Bar MAP sensor might work if you made a small chamber to
> average the pulses out.
> The hot exhaust gases should not reach the sensor as there should not be any
> air movement inside the tube.
> Filtering could also be done using software.
> 
> On some of the 90's Fords, they had a sensor that monitored the exhasust
> pressure.  I believe it has something to do with the EGR system.....Tim.
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