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Possible Ecu Failure


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my 95 ls 400 is cranking full force no spark getting fuel scanner cant establish a connection fuses appear fine used scanner with success day before problem was driving fine. 175000 tbelt is intact any suggestions

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I doubt ECU instantly failed. I'd rule out other things first. Double check fuses. Get a wiring diagram and probe power lines at the ecu. Check crank position sensor. Look for firing primary on coils.....

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