Service Engine Light

Tiny
KYMACHEN
  • MEMBER
  • FORD MUSTANG
I have an 02 Mustang 3.8l v6 manual tranny with 98,000 miles The serv Engine light is on, the trouble code says EGR Valve. The only sympton is that it continues to idle high for a few seconds when shifting gears. I removed and tried to clean the EGR Valve with WD40 reset the computer and the light came back on after about 20 miles of driving. It still Idles high for a few seconds when shifting but beside that the car runs well. Thanks
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Friday, June 1st, 2007 AT 2:43 PM

3 Replies

Tiny
RUDPRO
  • MEMBER
What trouble code does it set. There are several for the EGR system. What's the number, it begins
with a P.
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Friday, June 1st, 2007 AT 3:52 PM
Tiny
KYMACHEN
  • MEMBER
3 codes
1120
1121
0401
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Saturday, June 2nd, 2007 AT 11:10 PM
Tiny
RUDPRO
  • MEMBER
The first 2 codes are for the Throttle Position Sensor out of range and TPS being inconsistent with the Mass Air Flow Sensor. The third code is for the EGR Valve insufficient flow.
First thing to check is the EGR valve port. Take the valve off and check and clean the port if it's carboned up. If it's dirty, you can spray it with throttle body cleaner and even use a coat hanger to loosen it up if it's really bad.
To check the TPS you need a digital multimeter. You can buy a cheap one for $10 or so if you don't have one. Set the multimeter to dc volts. Unplug the electrical connector on the TPS. Turn the car key to run (engine off). Touch the black lead of the meter to a good ground and probe the 3 connectors of the wiring harness with the red lead of the meter. You should get 5 volts on one of the wires.
Next, turn the key off. Set the multimeter to ohms. Put one probe of the multimeter on the middle terminal of the SENSOR and the other probe on one of the outside terminal. Have someone operate the throttle very slowly to full open and very slowly back to closed. The meter should increase and decrease smoothly with the opening and closing of the throttle.
Repeat with the probe on the middle terminal and the other outside terminal. If you don't get the correct results the TPS is probably bad.
If the TPS checks OK I would check for vacuum leaks or an intake manifold leak.
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Sunday, June 3rd, 2007 AT 12:36 AM

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