Question about 2000 Ford Escort
Code reader >po171system lean bank one. I can`t find any vacuum leaks.One place said oxygen sensor bad,But this car has two one up stream one down stream.Another place said idol air controal valve bad,and another said throttle position sensor bad or idol speed control bad. Engine runs fast at warm up,car accelerates fine,pulls and runs fine at all speeds.don`t smoke.What do you think? thank you. where is the pcv valve hoses located. I have the same problem with my zx2. I had it tested and the sensor was bad now it says bank 1 running to lean. Where are the hoses??
It either has a vacuum leak or a dirty MAF. To test for vac leaks spray the engine with carb cleaner to see if the engine speed changes., if it does you fond the leak. The most common leak is pcv line coming straight off the back of the throttle body. Check there first. Also check to make sure there are no air leaks between the throttle body and the mass air flow. Don't replace the idle speed motor or the tps, they won't fix it. It is possible the o2 is the problem, but it usually isn't. P0107 Is usually always from the stuff i listed above.
Posted on Mar 01, 2009
Mine was a 2003 Ford Escort ZX2. It had a hole in the PCV elbow hose right next to the PCV entry point just to the right of the Exhaust manifold. Hard to get at but cheap and easy to fix.
Posted on Jun 14, 2009
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Posted on Jan 02, 2017
I decided to check the idol air control valve,when I removed it I found the problem right behind it. The P C V valve hose was just about into where it fastens to the intake,the other end was bad also. Cost me aout $6.00 Where auto parts stores were telling me parts would cost two or three hundred $$.
Posted on Jan 21, 2009
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