2003 Ford Crown Victoria P-71 bad fuel injectors?

FRONTPUSHBAR

MEMBER
24 POSTS

Hello! The story continues.

In August 2009 I bought 4 new CO2 sensors and
cleared the codes. Thought that this would solve
the problem.

In October 2009 the check engine light went on
again, but this time the reader displayed only one code: P0172. P0175 was gone.

Erased it, but after a couple of days the check
engine light went on again.

Engine seemed to run normal. I erased P0172
a couple of times and then I gave up. I didn ´t care
about the check engine light and drove with the car as usual.

3 month ago I realized that the engine started to
choke when backing up. As soon as I shifted into
reverse the engine almost stopped and the alternator
lamp was flickering. The symptoms stopped when
I pressed gently on the accelerator applying the brake
at the same time. No problems when driving in "D"
mode. So I ignored this and kept on driving.

Last week I changed the mass airflow sensor hoping
to get rid of the check engine light and to improve
the instable engine running when backing up. No
improvement. Check engine light went on after a
few miles. Reader still displayed the code P0172.

Today it was very hot - about 95 F. So I used the
A/C which I haven ´t done for a long time and
this time the engine stopped 3 times during
slow rolling in "D" mode and one time at 25 mph
which was very annoying. I was able to prevent
more engine stops by stepping on the acc. In that
moment when I saw the alternator lamp starting
to flash.

No problems when driving over 30 mph or idling.

I have also noticed that the engine is idling at high
rpm right after starting and runs normal as soon as
you engage "D". When you let the engine idle
right after the starting the rpm slowly goes down
to a normal rate.

But I ´m used to this symptoms since I have bought
the car so I don ´t know if this has anything to do
with my current problem.

So please give me some advice. Thank you.

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Saturday, July 10th, 2010 AT 2:27 PM

MERLIN2021

MECHANIC
17,250 POSTS

P0172 System too rich, bank one= passenger side, check the new O2 sensor, and sensor wiring harness, check fuel pressure (too high) stuck injector.
41) For Continuous Memory Only DTC P0171, P0172, P0174 Or P0175: Fuel System At Corrected Fuel Trim All Continuous Memory ignition and misfire DTCs must be serviced prior to servicing any fuel trim DTCs. DTCs P0171, P0172, P0174 and P0175 indicate a concern when adaptive fuel strategy senses a lean or rich condition beyond minimum or maximum calibrated limit. Fuel system DTC identification is as follows: � � � Bank No. 1 DTCs P0171 (lean), and P0172 (rich). � � � Bank No. 2 DTCs P0174 (lean), and P0175 (rich). Possible causes for these faults are: � � � Fuel System Excessive fuel pressure, leaking or contaminated fuel injectors, leaking fuel pressure regulator, low fuel pressure or engine running out of fuel or vapory recovery system fault. � � � Induction System Air leaks after MAF sensor, air intake system obstructions, vacuum leaks, PCV system or improperly seated engine oil dipstick. � � � EGR System Leaking gasket, stuck EGR valve or leaking diaphragm or EVR. � � � Engine Mechanical Engine oil overfilled, cam timing, cylinder compression or exhaust leaks before or near HO2S. Inspect engine for obvious defects in specified systems. Repair as necessary. If no faults are found, go to TEST DC, step 25). 42) Perform KOER Self-Test Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Disconnect fuel vapor hose from intake manifold and plug fitting at intake manifold. Start engine, and operate at 2000 RPM for 5 minutes, then allow to return to idle. Perform KOER ON-DEMAND SELF-TEST and proceed as follows: � � � If KOER DTCs P0040, P0041, P1127, P1128 or P1129 are present, go to appropriate system test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS. � � � If KOER DTC (P1131, P2195) or (P1151, P2197) is present, go to next step.
KOER ON-DEMAND SELF-TEST Description KOER on-demand self-test is a functional test of PCM performed with ignition key on, engine running. A check of certain inputs and outputs is made during operating conditions and normal operating temperature. The Brake Pedal Position (BPP) switch, Power Steering Pressure (PSP) switch and Transmission Control Switch (TCS) tests are part of KOER on-demand self-test and must be performed during this operation (if applicable). See BPP, PSP & TCS TEST PROCEDURES. A fault must be present at time of testing for KOER on-demand self-test to detect a fault. BPP, PSP & TCS Test Procedures This test ensures EEC-V system is able to detect a change of state in brakelight switch, TCS and PSP switches. During KOER on-demand self-test, the brake pedal must be applied and then released, TCS must be cycled, and steering wheel must be turned at least 1/4 of a revolution. Performing Self-Test To perform self-test, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps: � � � Select VEHICLE & ENGINE SELECTION menu. � � � Select NEW VEHICLE, YEAR & MODEL. � � � Select DIAGNOSTIC DATA LINK. � � � Select POWERTRAIN CONTROL MODULE. � � � Select DIAGNOSTIC TEST MODE. � � � Select KOER ON-DEMAND SELF-TEST. � � � Start engine and allow to idle. � � � Perform BPP, PSP & TCS TEST PROCEDURES when instructed by scan tool. � � � Record DTCs and perform appropriate system test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS. After KOER on-demand self-test is complete, cycle ignition switch before performing other self-tests or driving vehicle.

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Sunday, July 11th, 2010 AT 5:57 AM