21 Related Question … Two exhaust manifolds if it is a V-6 or a v-8, or one, maybe more, if it is a 4 cylinder engine and normally only one intake manifold, although I have seen two. Joined Sep 7, 2002. To your surprise, the intake manifold can be clean without the help of professional (only, if the person is comfortable and confident, enough to do so). Discussion Starter • #1 • Mar 20, 2011. trying to figure out where this is coming from, it sounds like its coming from around or under the intake manifold. Save Share. It is connected to the air filter at one end and the engine cylinders at the other. Can the air intake make a loud enough hissing under … It only whistles when the engine is warm and idling. A faulty exhaust manifold gasket will produce an exhaust leak that will sound like a hissing or tapping sound coming from the engine. … Another symptom of a faulty intake manifold gasket is coolant leaks. Jul 15, 2004 #1. Intake manifold leaks aren't extremely common, but they do happen. 1. However, I had a ticking sound from my intake manifold and it turned out to be my intake valves not sealing properly. 6 Posts . So on the compression stroke of my engine, the air would rush back into the intake manifold causing a sharp "whoosh" sound, which could be mistaken for a "ticking" sound. When I pulled in the garage, I could hear a loud sucking sound, like there was a vacuum leak. I couldn't see a crack. May he rest in peace, in our hearts and never forgotten. The sound may be especially pronounced during a cold start or during acceleration. Open your hood and let the … Popping Sound Intake Manifold Area-video. Cadillac Mechanic: Dave … Rough Idle--Intake Manifold Leak. A smoke machine can pressurize the intake manifold and put smoke or vapor into the system. For example, consider looking at the manifold from an end view, from the front or rear of the car. A vacuum leak caused by a bad intake manifold gasket can throw off the engine’s air-fuel ratio and cause engine performance issues such as misfires, a decrease in power and acceleration, a reduction in fuel efficiency, and even stalling. The intake manifold is basically a large multi-chambered component. A faulty exhaust manifold gasket will produce an exhaust leak that will sound like a hissing or tapping sound coming from the engine. 1 Posts . This can cause major performance issues, as the intake manifold gaskets seal engine vacuum and pressure. The intake manifold gasket seals the air from mixing with the coolant chamber. Problem Symptoms Causes Solutions; Vacuum leak from intake: Rough/High/Low Idle RPM Rough/Slow Acceleration High Pitch sound Check Engine Light Misfires & Backfires : Broken Vacuum hose Faulty intake manifold gasket Faulty throttle … The sound and residue are similar if not the same, except the leak is around the exhaust manifold and not the injector. Click to see full answer. Reply. I opened the hood, and the air sucking sound appeared to be coming from the intake manifold area. If this is the case, you are lucky because it’s a lot easier to identify a vacuum leak if you have a high pitch sound. Q: Knocking around intake manifold. This topic contains 6 replies, has 5 voices, and was last updated by Jared Thomson 7 years, 11 months ago. When I had a intake leak it sound as if there was a procharger under the hood . Creator. Occasionally, you may experience a vacuum leak into the intake ports from the crankcase of the motor, due to the intake manifold/cylinder head interface not being machined parallel. 2. I have a 2004 Nissan Altima and it’s just been one problem after another since acquiring it. 5/18/09- If only I could have seen him open his eyes. 2. Vacuum leaks can originate from various sources. Is it worth fixing or should I buy a new engine? 1,389 0. The oil leak is in the rear gasket and I was quoted over $1000 to fix. Jump to Latest Follow 1 - 17 of 17 Posts. The gasket and valves were replaced and all the leakages were removed. Systematic Procedure of How to Clean Intake Manifold. Coolant leaks. Miranda Merry. L ... up gunk around areas/cleaned TB and new gasket/cleaned ICV/replaced upper & lower boots/cleaned MAF/fixed vacuum leak from SAP. If there is a leak, you will see smoke come out. Just find where the sound comes from. However, the intake-to-head gaskets appear nicely-seated everywhere else, with no wrinkling at all along the bottom edges and no other apparent seepage anywhere (of course, the blue silicon front/rear gasket material has failed, causing the external leaks). AND RED APPROVED 388 Roller, custom grind cam, HSR, True dual exhaust,Borla and much more In Loving memory of my first son Brandon Harley. Discussion Starter • #1 • Sep 4, 2014. Engine would make what appeared to be a little more if one of the heated.... 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