I have a 1998 ford crown victoria i replaced the intake mainfold due to coolant leaking inside the cylinders now no coolant is leaking but car rides rough and misfires i tried switching coils around and spark plugs still same outcome when i unplug cylinder #1 no change in performance but whe i unplug any other cylinder the engine load increases obd 2 says misfire in cylinder 1 and 3 but cylinder one has a new coil and plug bosch platinum plus 2
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Cylinder misfire on #7.could be bad spark plug,or bad coil.try replacing coil and plug at# 7. It is the second last plug on the driver's side. If you pull the coil out and there is antifreeze in the spark plug hole,you may have a bad intake gasket or cracked intake manifold and the antifreeze is shorting the coil out. In that case you may have to replace the intake manifold.
The plug wires on this model year and prone to burn through, replace them all, do one at a time and always put them back in the factory wire looms they run through, that is very important, replace any you may break. Use high qyuailty oplug wuires foractory parts are preferred..
Notorious for intake leaks, the composite plastic intakes crack and leak coolant-as to the lack of power, you mght have overheated it and done some damage to the engine. There was a recall (information below) for the 4.6 for the intake-the overheating and lack of power means you should at least have compression checked and go from there-you may have bad head gaskets or worse. Do a compression test before you do anything else.
Ford Motor Company will extend the recall (01M02) on
4.6L V8 equipped vehicles with plastic intake manifolds. Some of the
composite intake manifolds used on 4.6L SOHC engines may develop fatigue
cracks at the coolant crossover duct. This condition could result in
engine coolant leakage which, if not serviced, may cause engine
overheating. Complete loss of coolant may result in engine damage or
The updated recall now includes: • Certain 1996
through 2001 Model Year Crown Victoria Police Interceptor • Certain
1998 through 2001 Model Year Crown Victoria with Taxi • Certain 1998
through 2001 Lincoln Town Car Limousine and Livery Prep Package •
Certain 1996-2001 Crown Victoria Taxis, Police cars and Lincoln Town Car
Limousine and Livery cars.
• Certain 1996 through 1997 Crown Victoria Police
Interceptor Vehicles with 4.6L SOHC engines built at the St. Thomas
Assembly Plant from the beginning of production for the 1996 Model Year
through January 28, 1997. • Certain 1998 through 2001 Crown Victoria
Police Interceptor Vehicles with 4.6L SOHC engines built at the St. Thomas
Assembly Plant from November 22, 1997 through December 15, 2000. •
Certain 1998 through 2001 Crown Victoria Taxi Vehicles with 4.6L SOHC
engines built at the St. Thomas Assembly Plant from November 22, 1997
through December 15, 2000. • Certain 1998 through 2001 Lincoln Town Car
Limousine Prep Package and Livery Vehicles with 4.6L SOHC engines built at
the Wixom Assembly Plant from November 22, 1997 through December 15,
you can drive it but it will damage your catalyst system, that is why the klight flashes to let you know other problems can develop. the car being a 2002 it has a misfire monitor in the computer. go to a local parts house and have them scan for misfire codes to see which cylinder is misfiring. make sure you check the intake at the #5 cylinder (which is the first one on the left side of the engine)to see if it is getting coolant in it from the intake leaking at the thermostat housing.
sounds like a bad idle air control valve, but if its misfiring thats another ball game,then you may have a bad spark plug or plug wire.when was the last time this car was tuned? if its been a while then you may what to start with a complete tune up, also have the fuel preasure check as this would also cause this problem but if it rides fine and only runs rough at idle then its not the pump.now we are back at a tune up.
first cylinder 4 is the last on the passenger side . first pull the coil out and check if there is water where the plug is. if there is take the water out and dry up the coil. if you find water you got a crack manifold or a bad intake manifold gasket. if there is no water replace the coil. good luck