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Either the difference in the connector itself, incomplete soldering, or "cold soldered joint" problems caused by not being able to see or test the joint before heat shrinking. This problem is particularly bad on MAF harness repairs; we have seen problems like wondering idle speed, and stalling, and measured weird voltage signals at the MAF itself; all of which totally disappeared the moment the repairs were cut out and just the wires soldered properly.
As for not remembering to slide the heat shrink tubing onto the wires first, everyone has done that at one time or another but once you have had to unsolder a repair just made in order to install it, you will remember to do it properly the next time, particularly if you are doing it on flat rate.....
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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