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Hey, you're in the vehicle / car zone--YOUR HANDYMAN ZONE!

Cars / Trucks / Vans Category: Engine System

Problem:

Engine backfires (closely related to a "muffler explosion") when you start your vehicle.

Tools / Materials (See Below for Applicability):

Solution:

 

An engine backfire is an "explosion" that takes place in the engine system, where fuel is ignited in the air intake manifold, causing the explosion sound to reverberate through the engine's carburetor. The term, "backfire," is commonly mistakenly used to call what is actually something entirely different and has nothing to do with an engine, which is a muffler explosion.  A muffler explosion, as the related how-to-page section speaks of, is the noisy blow-out of exhaust from the tailpipe of your vehicle's emission system when fuel that has not been burned (i.e., exhaust) is ignited upon the startup of the vehicle.  The following may be probable causes of your vehicle's engine backfire problem that you should consider checking, causes of which may similarly cause a muffler explosion:

                                (i.)    For Frequent Backfires:

  • The distributor may be worn out;

  • The engine vacuum may be suffering from a leak;

  • The carburetor may be dirty or otherwise worn out;

  • The timing of the ignition may be detrimentally off;

  • The intake valve train may be worn out; or

  • The exhaust valve train may be worn out.

                                (ii.)    For the Occasional Once-a-Day Backfire:

  • The positive crankcase ventilation (PCV) valve may be damaged;

  • The exhaust gas recirculation (EGR) valve may be damaged;

  • The carburetor's needle valve may be worn out or otherwise damaged; or

  • The carburetor's high float level may be worn out or otherwise damaged.

Any one of the above can be the cause of your vehicle's problem, so it would be best to pay attention to the above probable causes when attempting to diagnose and fix the problem.

Ed the Handyman

            &

Your Handyman Zone Team

 

 

                                                         

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