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Q:

Have a Ram 3500 Diesel and wont start in the cold or wet weather on 2003 Dodge Ram 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
It will start if sprayed with wd40 in air intake
(1) Answer
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Check your ecm for codes, pending codes or historical codes. If no codes you will need to view live data and check for any anomalies, glow plugs etc.