All manifold gasket leaks are bad and as a result, can cause all kinds of problems.
So, intake and exhaust leaks are both bad, and actually do fail quite often. But, intake manifold gasket leaks, are worse than exhaust. Because, they have more of an effect, on how your engine runs and, can do way more damage.
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Exhaust Manifold Leaks – Causes, Failure Signs, Potential Damage
GM 3100 – 3400 Engine Issues – Heads, Manifolds, Rocker Bolts
Intake Manifold Leaks – Causes, Symptoms, Testing and Prevention
Abnormal Exhaust Noise, Common On 02-05 Ford 6.0L Diesels
White Stuff, Under My Oil Filler Cap – What Is It ? Is It Bad ?
Antifreeze In Oil – Means Your Engine Is Leaking Internally
Tailpipe Smoke – The Color Of The Tailpipe Smoke, Tells A Story
Engine Misfire – Rough Engine Idle On GM 4.8L, 5.3L, 6.0L Engines
Using A Vacuum Gauge, To Test The Condition Of Your Engine
BY DANNY BENDER