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Subject I fixed a Z with similar syptoms, it was a corroded PTU
     
Posted by aliaZ on April 13, 2010 at 8:55 AM
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In Reply To not boosting more than 7-9 psi...... posted by john90zxtt(OH) on April 11, 2010 at 03:08 PM
     
Message subharness. The connection at the PTU itself was fine, but where the subharness connected to the main harness was a mess.

This was causing a weak spark, which caused a misfire as boost increased.

     
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