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Hello all,
I am working on a friend’s 2002 Ford Taurus SES with the 3.0 Vulcan Flex Fuel Engine.I am having an odd problems, it seems like a vaccum leak, and I have fixed 2 Vaccum leaks so far. One on the hard line on top of the engine going from the Vaccum Tree to a T on the other side, and a new PCV valve, line and elbow.
It is getting codes P0402 P1406 and was getting a Cat code, running the car at highways speeds for an hour cleared the cat code (he only drives 5 min each way to work and home pretty much). He has done zero maintenance on this car besides oil changes. Last night I did a the test with few cans of carb cleaner. The only time I heard the idle change was when I sprayed by the intake Plenum, but it only happened once. I have read it could the be EGR Valve, or the DPFE Sensor and as a last resort the Plenum. When I take off the vaccum line for the EGR and cover it with my finger, nothing changes, it still runs a little rough and sounds like a small miss is happening in the engine (like it “normally” does). This makes me think it is not the EGR. I probed the back of the DPFE and I got 5 volts pretty steady, but I haven’t tried a full test on it.
could it be another Vaccum leak I can’t find? Is the DPFE sensor gone?
I am thinking of pulling the plenum, then cleaning the EGR (or replace it for 30 bucks), while I am there, change plugs and wires and then toss it back together.
Any help on what it could be would be great before I get into it more, I don’t want to start throwing parts at it, but after spending 2 night rebuilding the brakes and linkages before I touched the engine, I am pretty much tired of look at this car.
thanks everyone!
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