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My car is a standard and whenever I release the gas I hear kind of like a popping type noise.Any ideas on what this could be?

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This is the excess fuel igniting in the exhaust system
It could be from a faulty mixture setting, incorrect ignition timing, leaking injector or bad valve s and seats
The vacuum goes over 20 inches of mercury on deceleration so weak valve springs will be pulled open on the inlet stroke and any fuel in the manifold will be passed out the open exhaust valve into a hot exhaust
run the fault codes and have a compression test done to determine the engine condition.

Posted on Apr 07, 2015


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Posted on Jan 02, 2017

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SOURCE: Making a rattling noise when i step on the gas.

several things could be wrong are you using 91 octane fuel or less? also it might be a timing issue you might be too far advanced in timing ... this causes preignition.. causing a rattle also cheaper fuel will do the same effect.. thanks Jerry holler if you need more.. also was the noise loud or just a mild noise ??

Posted on Apr 27, 2009

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SOURCE: I have a 2006 X3

Have the exhaust system checked. A small leak can let in air and that air lights gases not yet fully handled by the system.

Posted on May 11, 2011

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