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1996 Mercury Cougar Question: Engine Light keeps flashing & pistons sound like they are coming thought hood

 

Question

Tomp825, 4.6L V8, Springfield, VA, July 12, 2010, 13:47
 Rookie

At idle, the motor has a thump when the pistons fire.
Sounds like a piston misfire.

The engine light may be something else.

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  • Answer #1

    Dave_sab. July 12, 2010, 16:44
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     Journeyman

    If there is a low sounding knock which increases when you idle up a bit you most likely have bad rod bearings.

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  • Answer #2

    fernando July 12, 2010, 18:33
     Master

    Try to retrieve the diagnostics trouble codes from the computer to have an idea why the engine light is flashing.

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