The exhaust leak will set off a false lean condition, to which the ecu responds by increasing fuel delivery. Yes, a bad exhaust can cause rough idle by disrupting engine backpressure and airflow Engine performance and idle stability may suffer as a result. Discover how a bad exhaust system can lead to decreased engine performance, increased emissions, excessive engine noise, and reduced fuel efficiency The only way an exhaust leak can cause a rough idle is if the leak was in a place where it could enter the air intake system In most cases the leaks are on the sides of the engine or in the rear of the engine where the exhaust manifolds attach to the engine, or the point where the exhaust pipes attach to the exhaust manifolds.
A muffler with holes or cracks can cause exhaust gases to escape prematurely, disrupting the engine’s performance An exhaust manifold leak can cause a rough idle in your vehicle If there is a leak in the exhaust manifold, it can cause an imbalance in the pressure between the cylinders and the exhaust system This can lead to a misfire in one or more of the cylinders, causing a rough idle.
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