Question about 1992 Mercury Grand Marquis

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I have a 1992 Mercury Grand Marquis with the 4.6L V8 with roughly 50,000 to 60,000 miles on it and while the engine runes great when it is cold, when the engine warms up, it starts to rattle/knock during acceleration, but only above a very slow acceleration. It sounds as though it is coming from the top-end of the engine. At cruising throttle, and slow acceleration, the engine runs perfect.

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First, there are 8 bolts holding the metal Airhorn to the Intake manifold. Underneath this part is a gasket and under the gasket is a groove. The groove can Carbon up and affect the performance of your car. The gasket costs $10 and the job takes an hour or more.

If this does not help, you may need a knock sensor which is suppose to reduce the timing and keep the engine from knocking.

You can also get a free scan from Autozone or Oreillys and some other parts stores. This may tell you if other parts are needed. The gasket and groove I told you about will sometimes generate a Code 401. Just try cleaning the groove instead of buying an EGR or Solenoid.

Posted on Nov 08, 2010

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Posted on Jan 02, 2017

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1 Answer

My car make knock from engine why 4.6 v8


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WHATS THE FIRING ORDER FOR A 1992 GRAND MARUIS


For the 1992 Mercury Grand Marquis 4.6L SOHC V8:

Firing Order:
1-3-7-2-6-5-4-8

Cylinders:
.........(back).......
..|..4..|........|..8..|
..|..3..|........|..7..|
..|..2..|........|..6..|
..|..1..|........|..5..|
O<--Coil packs-->O
.........(front)

Coil:........................Coil:
.(back)....................(back)
(1)...(3)..................(7)...(8)
(6)...(5)..................(4)...(2)
(front).....................(front)

Let me know if this helped or if you have additional information or questions. Feel Free to contact me FixYa.com!

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