3.0 EVR (vacuum regulator) not operating

[drummindrummer]

Hi Folks:

I'm trying to pass Cali smog with an 87 Sable 3.0 and the EVR (vacuum regulator) isn't getting it's ground trigger when the r's increase (voltmeter shows 3v constant under all rpm's). Does anyone have an idea what I should check next? Is there another sensor that tells the ECU when this should occur? Thanks very much in advance for your knowledge. Markus

[fry628]

Your dpfe tells the vacuum regulator when to open and is a common thing to go out. Also it's important to know that rpm's do not make the regulator open, engine load does. When the dpfe senses the exhaust gases are rich it tells the regulator to open the egr valve for a cleaner burn

[drummindrummer]

Originally Posted by fry628

Your dpfe tells the vacuum regulator when to open and is a common thing to go out. Also it's important to know that rpm's do not make the regulator open, engine load does. When the dpfe senses the exhaust gases are rich it tells the regulator to open the egr valve for a cleaner burn

Words can't express my gratitude for your answer. I'll let you know how it works out. Markus

[drummindrummer]

Okay, I changed out the dpfe then tested the electrical to the EVR under load but still just a constant 3 volts there. I thought it a good idea to do some checking into the wiring for all this stuff and (manually performed, perhaps flawed trace work, without a wiring diagram) discovered this much...

DPFE plug (3 wires - {BRN/GRN} {OR/WHT} {BLK/WHT}):

*BRN/GRN seems to connect to connector block @ firewall;
*OR/WHT and BLK/WHT seem to go to and occupy two of the three
terminals of the TPS. If my presumption that these go to/from the
DPFE and the TPS directly is correct, there must be a short
connecting them. I'm getting zero-ish resistance at the leads while
both sensors are unplugged.

Is there a kind soul with wiring diagram/knowledge who can tell me if my trace work is good? Sorry for my ignorance, I'm trying to save my fixed/low-inc sister from the wolf of poverty. Thanks very much in advance, Markus

[fry628]

I just realized that you have a nissan while on a ford forum but that still shouldn't have much to do with theory. I don't have a wiring diagram. Have you cleared the code? You can't hold the brake to put the engine under a load, you have to be driving up a hill, passing or using a scan tool. I know that nissan dpfe hoses are bad about burning a hole in them.