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chipped ecu

Discussion in 'ECU's, Electronics, and Tuning' started by Wilshire, Nov 20, 2007.

  1. Wilshire

    Wilshire Big WIll

    Likes Received:
    Mar 17, 2007
    nor cal
    i recently bought a chipped ecu and when i put it in there is a very loud hissing sound. It really sounds like a vacume leak. and it also has an irregular idle, (jumps and drops). this continues for the first ten minutes the car runs then stops with a subtle clicking noise. Then everything is fine and normal.
    when i put my stock ecu in there was no problem at all and everything acted normally. ive re-installed and taken it out a few times and the results are the same.

    What could the noise be. I really have no clue due to it only acts up with the new ecu and not the stock one.

    any info would help
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