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2005 Focus ZX4 SE - P0171, Rough Idle, Dies when coming to a stop.

5435 Views 8 Replies 5 Participants Last post by  bcunningh
About a week ago I started to experience intermittent rough idling for 20-30 seconds then it would go back to normal. After a couple days of this I got a Check Engine Light and then it started dying when I would be coming to a stop. It won't die when it has just been cold started, but once it has warmed up it will die almost every time I come to a stop. I can keep it running by putting it in neutral and keeping the engine revved a little while I am stopped. I read the code and it came up P0171. I've checked and I can't find any obviously damaged vacuum hoses. I even looked underneath and found what I believe is the hose to the PCV Valve and that seems to be in fine shape. At this point I'm thinking I'll probably have to get it into a shop, but I wanted to ask if there is any more easy things to check beforehand.
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Call me the conspiracy buff if you will but I keep saying much of this is for a reason. The cars are living so long now they have to create new revenue streams by making parts that now break at any working on them and break easier without even touching them. Once the engineers have done the ultimate job they then turn them inward to design parts that last only so long before they fold up, you can tell it easily if you've looked at parts forever. The cars simply last too long now if you stay on top of them, they frazzle you down now by making little things break that irritate you more and more until you give up to buy new car. If you are willing to chase the small breakages the cars last 300K now.
 

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PCV valves if metal virtually NEVER go bad, they just clog and easy to unclog. The quick fix is to change it but then you always have to wonder did new maker of valve use the correct size metering orifice in it? They have a tendency to condense parts and why I always use the same OEM one over after cleaning. Haven't changed a valve since the '70s..................
 
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