Question about 1997 Ford Thunderbird LX

1 Answer

Service Engine Soon

Diagnostic test shows EGR valve excessive flow. One shop installed 2 new sensors ($285), said EGR valve ok, wiring/hoses ok. Light still on. They couldn't solve, said go to dealer. Ford Dealer diagnostic test ($100). Insisted EGR valve no good. Installed new EGR valve ($160), said wiring/hoses ok, computer ok. Service engine light still came on. Ford dealer examined car again. Now saying "computer no good", saying computer costs $500. Said need new computer because they show a "spiking" at the egr valve when testing. Have already paid $545.00 for parts and labor and light still on. Afraid to spend another $500 for a new computer cause their explanation why need new computer sounds like just guessing and not really sure. What shall I do?

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  • Anonymous Aug 22, 2008

    Benimur,

    Thanks for your email. I followed your suggestion removed negative battery cable/can carb-injector cleaner/fill-up Chevron Premium/drove 50 miles 75 mi hr. Light did not come on. Stopped do errand. When started up car again, same "service engine soon" light came on. Previously Shop 1 and Ford Dealer both said wires ok and wires look ok to me too, although totally unskilled. Ready for any other suggestions.

    Thanks,

    John

  • favlilian Sep 21, 2008

    My car has been accellerating on its own when I turn on the egnition key, the Service Engine light is on. I have taken it to the mechanics and they can't seem to find the problem. they changed the termostat and flushed the radiator, even did a diagnostic computer check that indicated no problem with the motor. Tell me is there a possibility it could be that the motor mounts are worn out and need replacing, do you think it could be that the motor is sagging and it makes it accellerate. My engine is also rattling some. Please help.

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  • Master
  • 6,966 Answers

Hi,

A couple of things you can try:

  • remove the negative battery terminal to reset your car's computer. There are some car stereos that would require a security code when the battery is removed;
  • on your next fill up, try if you can get a higher octane gas instead of your normal, say if you use to put in 91, shift temporarily to 95;
  • add a can of injector/carb cleaner in your gas tank;
  • on a long stretch, drive aggressively and hard. The idea is to clean your fuel system, combustion chamber, valves, exhaust manifold, catalytic converter, exhaust system including your EGR and O2 sensors.
If error indicator persist, trace the EGR wiring with special attention to the connectors at the ends.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 17, 2008

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I have p 1121 and a P 0401 codes on my 1998 ford windstar. are these related? what can I check? replaced the mass airflow sensor recently.




P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
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Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault. P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
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I have a 2004 pontiac grand am with the service engine light on. When read it was the P0300, P0401, and P1404 codes. The mechanic said there wasn't a leak, so it must be the EGR valve. It was replaced. I...


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Exhaust Gas Recirculation (EGR) System The exhaust gas recirculation (EGR) system is designed to:
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  • lower combustion temperatures.
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The amount of exhaust gas reintroduced and the timing of the cycle varies by calibration. Timing and volume are controlled by the following:
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  • uses a differential pressure feedback EGR sensor as the feedback device.
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  • controlled pressure is varied by the valve movement using vacuum output of the EGR vacuum regulator solenoid (9J459).
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Differential Pressure Feedback EGR Flow Diagram


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Differential Pressure Feedback EGR Sensor Removal
  1. Disconnect engine control sensor wiring (12A581) from Differential Pressure Feedback EGR Sensor.
  1. Disconnect Differential Pressure Feedback EGR Sensor hoses from EGR valve to exhaust manifold tube (9D477).
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Installation
  1. Follow removal procedure in reverse order.
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    Differential Pressure Feedback EGR Sensor, 3.0L (2V) Engine


    aa0036a.gif



    Differential Pressure Feedback EGR Sensor, 3.0L (4V) Engine


    a23840a.gif


    Item Part Number Description 1 6049 RH Cylinder Head 2 - Differential Pressure Feedback EGR Sensor 3 - Nut (2 Req'd) 4 - Stud Bolt 5 - Bolt (2 Req'd) 6 - Differential Pressure Feedback EGR Sensor Bracket A - Tighten to 5-7 Nm (45-61 Lb-In) B - Tighten to 8-12 Nm (71-106 Lb-In)

    Engine Emission Control Component Location-3.4L SHO Engine


    a25013a.gif


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  1. po401 refers to an insuffient flow of EGR gasses
  2. locate egr valve
  3. with engine running at idle
  4. on the underside of the valve you can access the diaphram.
  5. wearing glove if ness
  6. lift diaphram while idling
  7. does engine stall or run very rough?
  8. if not remove valve
  9. start engine
  10. you should hear a very large vaccum leak and exhaust noise
  11. if either are missing investigate cause
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  14. inspect sensor for damage
  15. inspect hose to sensor for damage
  16. replace sensor
  17. 9ecffd7.gif

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