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When I did my injectors, I put the seals on first. You will need to use a small flathead screwdriver to pry it up carefully.
When I did mine it cured this rhythmic unhappiness.
I'm not sure about orientation though. I didn't do it with mine....but I'll let somebody with more knowledge pipe in. The FSM does not mention anything about it so I would say its safe to assume it does not make a difference.
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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
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