Question about 2002 Ford Taurus
Idles very rough; stalls at stoplights. Stalls sometimes when the car is moving very slow.
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Posted on Jan 02, 2017
I would start with the Rubber elbow on the back of the intake, next to the IAC.
This has a habit of cracking, and causing unmetered air after the MAFS to get into the system. The closed loop control is not counting it, and the O2 sensors are reporting the lean condition on the back side.
Ignore the IAC notation in this picture ( only 1 I had ) You are going to want to remove the plastic cover on the throttle body, and take a look at the rubber vac line that is shown in this picture.
The other item could be the intake manifold is loose, but start with the vac lines, clear the code with a scanner, a battery disconnect for 5 min, or 2 driver cycles to see if at least the P0170 & P0174 codes are gone.
The P0136 & P0156 could be a melted wire as mcneb posted about, this is usually by the exhaust manifold. After checking and repairing the vac lines ( if required ) follow the harness from the 2nd set of O2 sensor ( think that is HO2S-12 & -22 if I recall correctly ) to the engine compartment.
Posted on Nov 17, 2009
Testimonial: "That was the problem fixed it and truck runs great! Thank You!"
SOURCE: f150 2002 4.2 eng codes:
1400 is dpfe, 1151 is an 02 sensor code, 1131 is also 02s11 code, P0316 = Engine Misfire Detected on Startup (First 1000 Revolutions)
Po301 Cylender 1 misfire, p0174 lean condition bank 2, And p0171 is lean bank 1. Either this is in need of a whosale of repairs or you have computer issues, From looking at the codes i would first do a complete tune up, Including wires, And inspect for a vacume leak before replacing any 02 sensors..
Posted on Jun 14, 2010
All these are fuel trim codes and fuel control O2 sensor related codes, you have something that is causing this as all the sensors seldom fail. My advice here is to see a Ford dealer for the diagnostics before any parts are replaced.
Posted on Jun 27, 2012
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