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Originally Posted by 350SE BENZ
This morning while driving in my w116 280s, i used the kickdown, while driving at about 35mph, the tranny shifted to 3rd, but the engine backfired through the carb once, it run fine after that, and also on subsequent kickdowns it never backfired again.
i know of backfire through the exhuast, but not the carburettor, what can cuase this.
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Improper secondary spring adjustment ,accelerator pump mis -adjusted or leaking are a few things that come to mind as well as the egr valve defective or could have just been a while since you opened her up and she coughed on the first try .....