2003 Mitsubishi Mirage No Spark Stalls

2003 MITSUBISHI
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TIGGERCHAD
  • MEMBER
  • 2 POSTS
i have a 2003 mirage and i think i have damaged my computer? i cannot start my car, i have power, fuel, everything except spark from leads? but here is the funny thing if i disconnect the two computers (main and mysterious one in middle or dash near gear stick) and reconnect it will start but stall as soon as you pull throttel cable. what do i do????
Apr 16, 2006 at 11:44 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
You better leave the mystery computer alone. It is the air bag computer.

Leave the other one alone because you aren't doing anything except wearing out the connections.

get back to basics. You are missing spark. Let me know exactyly what you are missing and we'll go from there I suspect a coil pack bad.

A bad computer occurs in one of 5000 car problems.
Apr 16, 2006 at 1:32 PM
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TIGGERCHAD
  • MEMBER
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ok i can get the car to start but only once after i disconnect and reconnect the main computer but it will only idel. if i quickly touch the trottel it will stall but i can increse rpm but only slowly up and down. the car has only done 50 thow k's but it has been a hard 50 as i am running nos. but this shouldn't to anything to the dizzy? should it. i have 4 point spark plugs chage oil ect regualy and do look after it but wouldn't suprise me if it has something to do with it.
Apr 17, 2006 at 10:00 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Hummm, the only sensor that changed immediatly when yoiu increase RPM is the throttle positon sensor. If you have a meter, proble the center wire with key off. tuen the key on (no start) and manually increase the throttle angle. The voltage should go up slowy to 5 volts with about .8 to 1 volt at the throttle stop. Good luck
Apr 18, 2006 at 12:24 AM
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Suggested Repair

Stop disconnecting the engine computer and the airbag module. If spark is missing, inspect the coil pack. Also test the throttle position sensor with the key on and engine off: the center-wire voltage should be about 0.8 to 1 volt at closed throttle and rise smoothly to about 5 volts as the throttle opens.

Conversation Summary

The owner of a 2003 Mitsubishi Mirage reported no spark and said the car would start only after disconnecting and reconnecting the computers, then stall when the throttle was opened. The expert said the module near the gear selector is the airbag computer and advised leaving both modules connected. After the owner reported idle-only running and stalling on quick throttle input, the expert recommended testing the throttle position sensor and earlier suspected a bad coil pack.

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