When I get my truck back today I plan on installing my new MSD MAP sensor from summit racing. I just finally saw the second one on my truck's firewall. The one I want to replace is the one in the top of the intake right ??
Just checking :exactly:

Please let us know how it works for you as $55 is pretty cheap

The one on the firewall is the BARO sensor for the hated EGR http://www.dieselplace.com/forum/images/smilies/Throwup.gif

You are correct, replace the one on the intake.

You'll have to reuse your old o-ring because the new one doesnt come with one. Other than that, plug and play. Before the map I maxed at 10-11 psi, and after the map install, I was peaking at 18 and running a constant 16psi. But I have the "f " engine so you may see slightly less maybe. Let us know how she goes.

The one on the firewall is the BARO sensor for the hated EGR http://www.dieselplace.com/forum/images/smilies/Throwup.gif

You are correct, replace the one on the intake.There is no EGR on HD engines but some still have the BARO on the firewall I guess.

I have the same engine as you do born ready so results should be close also:grd:

All '94, OBDI '95 HD or F engines have a baro on the firewall. It can be resisted too, but to what effect is questionable. It raised the WGDC on my '94 when I put a 5.6K ohm resistor on it, so I left it.

Thanks for clearing up the mud there QM

OBD II non EGR baro is sensed at start up through MAP so it has 1 sensor with dual function.

EGR OBDII has MAP & firewall; firewall sensor is the dual function part, baro at start up and used as EGR control feedback after start up.