Question about 1990 Ford Thunderbird

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I have a 90 t-bird SC 5-speed supercharged and its been running bad so i hooked up a ob2 code reader and the codes it gave me were (neutral pressure switch (NPS) circut failure, citcuit open 3.8L SFI) and (spout signal Problem) So Im woindering where doi i start and how do i fix it?

Posted by missy_z_69 on


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  • Ford Master
  • 6,360 Answers

I suggest you get one of those manuals people get nowadays to do it yourself.. My brother used it to repair my car and it's totally repaired now.
he got it from.

Posted on Mar 07, 2018


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Richard Finch

  • 397 Answers

SOURCE: ob2 code p14444

P1444 Purge Flow Sensor circuit Input Low
Evaporative emmision control system control valve malfunction
You can find all the fault codes here:

Posted on Jul 24, 2008



  • 5 Answers

SOURCE: check engine light on,idols rough,fine at all other speeds.

I decided to check the idol air control valve,when I removed it I found the problem right behind it. The P C V valve hose was just about into where it fastens to the intake,the other end was bad also. Cost me aout $6.00 Where auto parts stores were telling me parts would cost two or three hundred $$.

Posted on Jan 21, 2009


Clint Smock

  • 4669 Answers

SOURCE: 1996 Ford T Bird obd codes

No, does the transmission still shift gears? Might be a power feed problem.

Posted on Mar 28, 2009


Clint Smock

  • 4669 Answers

SOURCE: 96 ford T Bird obd codes

It would cause codes but not transmission shift problems

Posted on Mar 28, 2009

Chris Yelton

  • 708 Answers


P0320 - Ignition Engine Speed Input Circuit Malfunction - The ignition engine speed sensor input signal to PCM is continuously monitored . P0320 indicates that two successive erratic profile ignition pickup ( PIP ) pulses have occurred Some possible causes are : loose wires / connectors , arching secondary ignition components ( coil , wires , + plugs ) , on board transmitter ( 2 - way radio )

Posted on Jul 15, 2009

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