Signs of stuck open or stuck closed egr valve going bad. In this video I discuss all thr classic symptoms of a stuck open or stuck closed egr valve. In most cases egr valve fail due to carbon build-up which will clog passages. Cleaning the egr passages may fix the issue. If the engine is pinging or knocking a bad egr may be the problem. In addition, I also explain how an egr valve work and its function.
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