1992 Mustang Lx Wont Run

Discussion in '2.3L (N/A & Turbo) Tech' started by Lexi, May 21, 2013.


  1. Lexi

    Lexi New Member

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    We have a 92 mustang lx 2.3l non turbo that we bought after it had been sitting for 4-5 years. We cleaned out the tank, changed the plugs and it still ran like crap. It now runs high rpms on start up and idles down after about 5 seconds and dies after 10 seconds. Was told it was the Mass Air Flow and we changed it. It runs better but still have the same issue. We tried replacing the Idle Air Control Valve which did nothing. With both the MAF and the IAC unplugged, the car idles GREAT! With both plugged in, it doesn't want to run for ****. Is it possible the TPS is bad or fuel pump or fuel filter? We have spark for sure and compression. Also could it be the fuel regulator?! I don't deal much with fuel injection and it's eating at me why it won't run.
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  2. davis3

    davis3 Active Member

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    Welcome!

    I always start with pulling the trouble codes.
    Even if the check engine light is not on, there still may be a code.
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  3. Lexi

    Lexi New Member

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    We've looked around and couldn't find anyone that could pull codes for the obd1 computers.
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  4. davis3

    davis3 Active Member

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  5. 91TwighlightGT

    91TwighlightGT Active Member

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  6. Lexi

    Lexi New Member

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    We went and bought the reader so he can check now. My husband said the car is using battery power even when it's just sitting so even though we just bought a brand new battery it dies every time. I don't know the specifics.
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  7. Lexi

    Lexi New Member

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    DO YOU KNOW WHAT THE TWO BLACK BOXES ON EITHER SIDE OF THE FRONT SIDE OF THE RADIATOR ARE? IM ASSUMING RELAYS OF SOME SORT? CANT FIND ANYTHING ONLINE ABOUT THEM BUT THE PASSENGERS SIDE LOOKS LIKE IT HAS BEEN CHEWED ON BY MICE. ALL OTHER ELECTRONICS APPEAR TO BE INTACT AND I FOUND ONE VACUUM LINE THAT COULD HAVE BEEN CAUSING A SMALL ISSUE BUT STILL WONT STAY RUNNING. I PULLED THE VACUUM LINE OFF THE EGR AND WAS GETTING CONSTANT VACUUM BUT THE MOTOR WAS SURGING THE ENTIRE TIME. ALSO, HOW CAN YOU TEST THE MAP AND THE EVR? COMPUTER HASN'T PULLED ANY CODES AT THIS TIME.
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  8. davis3

    davis3 Active Member

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    Air bag sensors?
    I'm not too familiar with the fox body stuff.

    Might want to buy a Chilton or Haynes repair manual.
    A lot of info in those.

    Also, yours CAPS are on.
    #8
  9. 91TwighlightGT

    91TwighlightGT Active Member

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    I believe we are also talking about air bag sensors. Most, if not all, relays for a 92 2.3L are in the Integrated Relay Control Module (IRCM) which is known to fail but unlikely the problem here.

    For your drain, follow these instructions...

    http://www.wikihow.com/Find-a-Parasitic-Battery-Drain

    Charge the battery first, of course.

    From another thread I posted in today...


    http://oldfuelinjection.com/?p=27

    http://troubleshootmyvehicle.com/ford/4.9L-5.0L-5.8L/how-to-test-the-map-sensor-1
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  10. Lexi

    Lexi New Member

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    The car still isn't throwing any codes at me still. You can keep the car running but only by keeping the throttle revving and even sometimes that doesn't work. What I did notice is how the car idles. It will idle fine and the it will jump real high if you barely get on the gas even the slightest bit. you can put the pedal 1/4 way to the floor and then open it all the way and go back to 1/4 and the way it runs is completely different it seems? Its hard to describe.
    #10
  11. 91TwighlightGT

    91TwighlightGT Active Member

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    There are a lot of possibilities - a vacuum leak can cause a high idle and a dying problem, so double check all your vacuum connections and hoses. The EGR (seems to be a very common 2.3L problem) can cause issues if it is malfunctioning, including idle problems and stalling.

    You asked about the TPS earlier, here is the test for it.

    http://easyautodiagnostics.com/ford/tps/2.3L/ranger/multimeter_tps_test_1.php

    Unfortunately, you are going to have a difficult problem because there are no codes, so we have nothing to go on. Now, if the battery was just dead any codes are cleared, so I would try to run it again and re-run for codes.

    Also, we need to cover the basics as well, which is fuel pressure, vacuum, spark and compression. Weakness in any of these areas could cause a driveability problem.

    One telling thing, though, is that the car is running better with the MAF and IAC unplugged - with these unplugged, the car is going into a limp mode where it uses a predetermined fuel and air strategy. This indicates that we have a problem with one of the sensors, a wiring problem, or (unlikely) a PCM issue. I would double check all connections, grounds, and vacuum lines to the various sensors and really try hard to get it to throw some codes.
    #11
  12. 4cammer72

    4cammer72 Likes to drop it and leave it crusty lookin

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    if there are no fault codes, it should give you an 11, if it wont even give that then the ecu is bad...did you try key on engine off codes?
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  13. Lexi

    Lexi New Member

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    Yes we did the code read with key on engine off and got nothing. The battery still won't stay charged. The car had been hit at the gas station with the previous owner right on the fuel door. Is it possible it knocked a ground for a loop or something like that? Also, can you test the ECU any other way to make sure that it is in fact the issue? The code reader doesn't light up at any time but it does click through the relays and turns on the fan for a second. Would that be a sign of a good ECU?
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  14. 4cammer72

    4cammer72 Likes to drop it and leave it crusty lookin

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    i wish id heard the wreck part earlier, there should be a switch in the trunk, i believe on the drivers side that will trip when in an accident to shut off fuel.. take a look and reset the switch and it should start...
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  15. Lexi

    Lexi New Member

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    We found and checked the inertial switch in the trunk on the tail light panel. With tripped, the fuel pump would do nothing like expected however it was not tripped and you can hear the fuel pump before you turn the key to start. Anymore info on the ECU?
    #15
  16. 4cammer72

    4cammer72 Likes to drop it and leave it crusty lookin

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    if it will not give codes it is done!!!!
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