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I'd look at... (archive)
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Posted by Mike W. on December 09, 2001 at 01:51:11:

In Reply to: How to determine if fuel injectors are good? posted by jeff'86 745i on December 08, 2001 at 07:37:09:

The only time I have seen backfiring through the intake on the injected cars is when the valves are adjusted too tight. This can happen for several reasons, but that is where I would start to look. As far as injectors go, Techron is the only cleaner I have had do any good, but it doesn't always have an effect. Bad injectors can leak either internally, resulting in a gas smell and rough running when started, or externally, meaning leaking gas and the consequent odor in the engine compartment.
Mike W.

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