Hello and welcome to 2carpros today we will show you how to find a vacuum leak under the hood of your car important start with the engine cold and avoid spraying the exhaust manifolds if you . Hey guys today i show you how to diagnose a breached intake plenum gasket last week i showed you how you could build a replacement aluminum one yourself for way cheaper than a pre made kit next . Intermittent vacuum leak idles fine runs great however get intermittent rough idle major vacuum leak any ideas where to look just did recent intake plenum gasket this occured before the . My dodge ram 1500 52 has a vacuum leak that when hissing causes my rpms to drop and the engine slightly bogs out after a couple seconds the hissing will stop and the rpms return to normal . Sometimes pcv valves can fail open causing a vacuum leak through the crankcase sucking oil into the air intake causing the engine to run lean and run hotter with pinging spark knock i still
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