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Old 03-04-2013, 04:08 PM
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1990 pontiac grand am 2.5 liter single fuel injecter i believe its an se
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Old 03-04-2013, 04:23 PM
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Far as I can tell, its a purple wire with a white stripe at the distributor.
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Old 03-04-2013, 11:36 PM
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thanks 2kg4u but it is a distributorless system. was hoping i could tap into wiring harness as some of these cars have tach installed.
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Old 03-05-2013, 06:15 AM
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autozone and that dont have interior diagrams for cars that old, unfortunately. just out of curiosity what does the tach wire have anything to do with inspection?
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Old 03-05-2013, 10:35 AM
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the original issue was idle speed was over specs and they refused to test. after making repairs i wanted to check idle speed before taking it back in.
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Old 03-05-2013, 11:02 AM
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ok. seems weird here obd1 vehicles just get checked for no CEL and "presence of factory emissions equipment."
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Old 03-05-2013, 06:26 PM
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hydrocarbons, co and no are checked at idel speed and at around 2000 rpm. max limits by state on idle speeds
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Old 03-06-2013, 09:03 AM
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Originally Posted by vince77b
thanks 2kg4u but it is a distributorless system. was hoping i could tap into wiring harness as some of these cars have tach installed.

Purple wire with white stripe at the ignition coil pack.
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Old 03-07-2013, 06:43 PM
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thanks for everyone'* help car passed smog idle was good.
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