Please show pictures of how you installed it. Believe it or not location does matter. Did you soldier the connections? Are you certain your ground connection is adequate? Do you have a solid (bright) red light on the unit? Which TPIA model are you using? DLI?My install was performed with the help of this technical article: [ http://www.twinturbo.net/nissan/300zx/tech/hkstpia/hkstpia.html ] BTW you do have to reconnect the PTU harness after you make your connections. Are you sure you have a good connections at the PTU harness? A quick tug on the PTU harness will move the connections away from the plug ever so slightly and you [WON't] be able to start your car. Check the obvious and let me know how you made out. I've only see a few TPIA's installed but I never known them to go bad.
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