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Old 11-20-2013, 09:17 PM   #1
nick79$
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2005 focus 2.0 rough idle & high fuel trims

My car keeps throwing the po171 lean code. And idles really rough.. Im trying to diagnose the problem by looking at the fuel trims..

At hwy speed (2300 rpm) my long term is steady around 9 or 10.. my short term bounces between -2 and positive 2. At idle long term is 22-25 and the short term moves between -2 and +6. Here is the strange thing.. if I let it idle for 5 to 10 minutes the short term will jump up to 25!!! What is going on?

From what i have read this could indicate a a vacuum leak. I have used a whole can of carb spray checking for leaks... If there would be a leak there is a good chance I would have found it. What else could it be.\? I'm dreading bringing it into the shop!! So if you have any ideas PLEASE let me know!
Thanks,Nick


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Old 11-22-2013, 09:02 AM   #2
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OK,, big turn out on the answers here.. let me rephrase the question.. Does anyone know where I can find the correct EGR readout? I've looked all over the internet and bought a Haynes manual. I'd like to find a place that can tell me what all the sensor readings should be.
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Old 11-22-2013, 10:13 AM   #3
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Just checked my Haynes manual and no, it doesn't say anything about readings for the EGR system. Just torque values. Sorry, man! A common vacuum leak is the little hose in the middle of the intake manifold. It runs between cylinders 2 and 3 and cracks at the bend. Have you tried the cigar method? Not my favorite, but you pull off a hose, take puffs off a cigar, and blow the smoke into the system. (He who is without sin, cast the first stone!)

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Old 11-22-2013, 03:00 PM   #4
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What hose do u blow smoke into?
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Old 11-23-2013, 11:03 AM   #5
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It doesn't really matter. If you want to be really fancy, go to the parts store and get a length of vacuum hose and one of those plastic T fittings. Cut off a small piece of hose and put it on one end of the T, then put the rest on another end. Then find any old hose on the intake, pull it off, and insert your adapter. Whatever hose you removed, put it onto the last barb on the T. Smoke like a chimney, fill up the manifold, and see where the stuff comes leaking out.

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Old 11-23-2013, 07:51 PM   #6
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PCV hose inside the intake loop is the common source of your issue there. It cracks to make a vacuum leak.

http://www.focusfanatics.com/forum/s...ratec+pcv+hose
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Old 11-23-2013, 07:55 PM   #7
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Old 11-25-2013, 10:04 PM   #8
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Yeah, what's happening with the car?

Toby
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