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2.3l N/A 90' Mustang Hatchback. Has Spark, Fuel To Rail (injectors will not open), Timing is good in all forms to my knowledge (cam, timing belt, Distributor) Firing order is correct. recent mod includes an air/fuel ratio gauge (Possible Interference?) (Ran fine for several months after i installed the gauge before this occured so i doubt it's related)

i was driving home and my car died right as i pulled in the drive. it started back up but only for a moment, and only when i held the throttle at around 3,000 RPM. if i did not hold the throttle it died immediately after a small sputter of TRYING to start. while holding the throttle the car would run for a maximum of 15 seconds. this only occured shortly after the car died. now i can't get it to run for even 3 seconds at any throttle position! after putting a code scanner on the car i get codes 67 and 84...these codes are defined as follows....have both listings from repair manual and code scanner booklet here.


67 (Repair Manual Definition)

Neutral Drive Switch or Circuit

67 (Code Scanner Definition)

Improper signals are being received from either the Neutral Drive Switch (NDS) Neutral Gear Switch (NGS) Neutral Pressure Switch (NPS) Clutch Switch (CS) Manual Lever Position (MLP) sensor or Air Conditioner Clutch (ACC) or, Air Conditioner (A/C) on during Self-Test

84 (Repair Manual Definition)

EGR Control Circuit

84 (Code Scanner Definition)

EGR Vacuum - Solenoids

EGR Vacuum Regulator - Solenoids

EGR Shut-Off solenoid - Solenoids


any insight as to which of these are a good candidate for replacement would be appreciated. perhaps a little how-to-advice as well, or some things i can do to test these.
 

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your code 67 is is probably caused by doing the test with the car in first gear.Make sure your car is in neutral with your emergency brake set before you start the test.
 

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well an update to code 84 if you have a similar mustang as mine. code 84 as you see list 3 possibilities

EGR Vacuum - Solenoids applies to turbo motors

EGR Vacuum Regulator - Solenoids applies to this mustang

EGR Shut-Off solenoid - Solenoids this one im not sure about, i just know it doesn't register in any research or the parts stores computers. so this one is likely a possibility for another type of vehicle all together!

so if you've had a similar problem as i have then order the EGR Vacuum Regulator if all else fails, it cost me 70 bucks and it will be here next week at which point we will see if it works! WISH ME LUCK!!
 

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your code 67 is is probably caused by doing the test with the car in first gear.Make sure your car is in neutral with your emergency brake set before you start the test.
and yes you were absolutely right, i made sure tranny was in neutral and did a retest and code 67 vanished!
 

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ok if you have a 2.3 mustang and see trouble code 84 it is the EGR Vacuum Regulator Solenoid. if you have code 84 this means the solenoid does not work, therfore does not open your fuel regulator. which in turn prevents your fuel injectors from firing. to confirm this just pull a spark plug out and smell it for gas, if nothing then your injectors aren't firing and when code 84 is present you can gaurantee what the source of the problem is. it's about $70 in the states. not sure if you were to have to order one from outside the U.S. but hope my troubles have been informative and hopefully this thread will help someone else out in the future. now i just reset my timing and my car will run perfectly again :) peace!
 
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