Question about 2000 Ford Taurus

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Engine has a code 171 & 174 how can I fix this

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I saw a posting on another site about the PCV valve elbow where it goes into the intake manifold. The elbow is smooth rubber and collapses causing vacuum problems. Sure enough mine was totally collapsed. The part was only 25.00 at the Ford Dealership and I had it put on. It actually seemed better for a while. I thought that would be the end of it. But about 1 week after the codes reappeared and the same symptoms as well. All this time since it started back 5 months ago I've had horrible gas mileage. I wish there was a way to check the whole vacuum system for problems because that is where seems to still be after reading tons of postings. I'm not sure if it is in the intake manifold gasket itself or some vacuum line. I'm frustrated and very leery of replacing 02 sensors because it seems unlikely that they are both bad at the same time. I also notice that when the car a going down the road I can feel it speed up a little and come back down. It sure seems to be an air/fuel mixture problem. Anybody have and feedback. thanks in advance

Posted on Jul 31, 2013

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