Question about 1992 Mitsubishi 3000GT

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Engine will randomly shut off while driving at various speeds, sometimes while idling. also security system often does not work, and sometimes activates itself and sounds alarm.

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  • Anonymous Oct 03, 2008

    my 1992 3000gt randomly shuts down while driving - no power steering, nothing. Any comments or suggestions would be helpful.

  • madmach Feb 26, 2009

    Finally fixed it. After a bit of research and experimentation, narrowed it down the the ECU. Turns out they manufactured it with lousy capacitors, which leaked on the motherboard and severed some contacts. This is a common problem with Stealths and 3000GTs from 1991-94.

    Removed the unit myself (found instructions online, took me 15 minutes). Sent it to an outfit in Florida and had it rebuilt, for $175 with an 18 month guarantee. Works great now! No stalling!

    If anybody has a similar problem, don't take it to a dealer. They know what is wrong, it won't show up on their computer, and unless they are actually honest, they won't find it until you have spent at least two grand.

    Instead, pull it out yourself (unless your best friend or neighbor is a better at using a screwdriver and socket) and send it off to a reputable ECU repair shop. Make sure you get a warranty, there are a few theives in the business.


  • madmach Feb 26, 2009

    Finally fixed it. After a bit of research and experimentation, narrowed
    it down the the ECU. Turns out they manufactured it with lousy
    capacitors, which leaked on the motherboard and severed some contacts. This is a common problem with Stealths and 3000GTs from 1991-94.

    Removed
    the unit myself (found instructions online, took me 15 minutes). Sent
    it to an outfit in Florida and had it rebuilt, for $175 with an 18
    month guarantee. Works great now! No stalling!

    If anybody has a similar problem, don't take it to a dealer. They know what is wrong, it won't show up on their computer, and unless they are actually honest, they won't find it until you have spent at least two grand.

    Instead,
    pull it out yourself (unless your best friend or neighbor is a better
    at using a screwdriver and socket) and send it off to a reputable ECU
    repair shop. Make sure you get a warranty, there are a few theives in
    the business.

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1993 Mitsubishi 3000 GT stalls for no good reason, you never really know for sure exactly when it’s going to happen. It might start up right away, or after a few cranks. It may be hard to start in the first place. This could be caused by a faulty ignition switch, and could be easily repaired.
.5- If the engine cranks but wont start, hold the key firmly pressed inward or frontward while trying to start.
1- If the engine starts: energetically jiggle the ignition key back and forth while the engine is running.
2- If the engine stalls at any time while doing this, then you may have a defective ignition switch.
2.5- Remove the Ignition key from the ignition.
3- Remove the four screws from underneath the steering column cover.
4- Hold the lower half of the cover with both hands and pull it apart from the upper half. You might have to use some force to overcome the locking tabs, you might have to tilt the steering wheel up or down to remove the covers.
5- Insert the ignition key back into the key cylinder (ignition switch)
6- Turn the key to the on position (don’t start the engine)
7- Move the key in and outward while observing the opposite side of the key cylinder
8- If the opposite end of the key cylinder moves even a little, while moving the key; then the wiring side of the ignition switch has popped out of the key cylinder and needs to be secured back into place. (You don’t have to replace the key cylinder)
9- Press the wiring end of the key cylinder inward and tie it down firmly with a strong nylon zip tie.
10- This should take care of the problem.
10.5- Remove the ignition key.
11- Reinstall the removed parts.

Don’t use a rubber band to tie down the loose ignition part; it will break-off when the ignition switch gets hot.

Posted on Sep 24, 2008

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