Misfires Under Load on Mazda Millenia

Misfires under load (acceleration) can be caused by the valve cover gaskets leaking oil into the spark plug wells shorting the spark plugs to the cylinder head. New spark plug wires will be needed and the valve cover needs to be resealed.

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Average mileage: 150,948 (50,000–230,000)
Engines affected: 2.3L V6 Supercharged, 2.5L V6
8 model years affected: 1995, 1996, 1997, 1998, more1999, 2000, 2001, 2002
32 people reported this problem
12 people shared problem details
loss of Acelebration. when I get about 40/45 miles an hour its misfiring and shaking I've changed the wires and plugs and the valve cover gasket but it still doing it don't know what to do
1999 Mazda Millenia- 2.5L V6175,000
Check engine light came on and started blinking and then it started to sputter. Checked it out with the computer and came back three codes PO400, PO404 and PO406. Cylinder six is misfiring.
1995 Mazda Millenia- 2.5L V675,000
Valve cover s leaking oil into plug wells shorting out spark plugs
2000 Mazda Millenia165,000
Car keeps dying on me! runs great in morning come home from work cant make it home.
2002 Mazda Millenia- 2.5L V6141,000
Once the engine warms up, it begins to stall, then doesn't start again till cooler. One out of one misfire shows up on cylinder 6,which has small amounts of oil at the base of the plug. After restarting, loss of acceleration and eventually stalling occurs. The engine is hot, but doesn't read high, and all fluids check normal. No vacuum leaks either. Plugs, wires have been replaced, all plugs sparkplhg. I'm seeing a minor leak behind the lower back to the left of the timing case.
2002 Mazda Millenia- 2.5L V6115,000
Misfire in the 3rd cylinder, oil found in the spark plug wells, oil leak from the valve cover. I took the car to the shop and they will replace the valve gasket for $400, hoping that could solve the problem
Car has misfire in 3rd cylinder also has oil in 3rd cylinder around spark plug
1999 Mazda Millenia- 2.3L V6 Supercharged65,000
Cylinder 6 misfires causing check engine light to appear. Replaced plugs & boot (on #6). Hope this works.
2002 Mazda Millenia- 2.5L V6137,000
I replaced the distriuter cap now I don't know what plug goes where in the right order.
2000 Mazda Millenia- 2.5L V696,000
When vehicle comes to a stop and idles in drive the rpms start to jump and sometimes the car stalls out, but starts back up . Car drives fine while its accelerating just when it comes to a stop it can stall out
1998 Mazda Millenia- 2.5L V6180,000
Check engine light flashing Codes p0325 and p0303 the car idles and drives roughly Changed plug wires and plugs, cap and rotor, and ignition coil My next step is the valve cover gaskets and seals and knonk sensor Also possible that the catalytic converter is going out idk Can't take it anymore
2000 Mazda Millenia- 2.5L V6123,000
I was just doing some routine maintanance changing the plug wires and spark plugs and when i got to the back 3 spark plugs i noticed the first one was dripping with oil and oil was puddle in where the spark plug goes. The job calls for 3 and a half hours labor. Does not sound fun.
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