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Misfire and rough idle

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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It may be the Ignition module. This is the little thin circuit card that tells the Coils to fire. Trace the small electrical wire from the 1,3 coil back to this module.

Posted on Dec 21, 2007

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P0307 code on a 2005 crown vic


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.

Dec 19, 2013 | 2005 Ford Crown Victoria

1 Answer

1996 crown victoria misfiring loss of power under light to heavy acceleration, rough idle


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..

Jun 07, 2013 | 1996 Ford Crown Victoria

1 Answer

Replace intake manifold now check engine light on


You don't want to use a car with a flashing check light

On a Ford, that is a Class A Cylinder Misfire

The problem was put in there, I assume, from work
that wasn't checked before returning your car

Could have vacuum leaks with the new manifold

Should have smoke tested after the install,road tested,
looked at all data,mode #06 misfire counts,etc

Apr 05, 2013 | 2001 Ford Crown Victoria

1 Answer

Water pump failed. Car overheated. Engine lost power. Car smoke out from back of engine and from rear of car. I replaced water pump. Car still smokes when I drive it. Still has no power.


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 engine failure.
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, 2000.

Sep 23, 2011 | 2001 Ford Crown Victoria

1 Answer

My 2002 crown vic is misfiring and the check engine light flashes when speeds of over twenty miles of hour are reached. Is it safe to drive. How can I fix this


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.

Jul 30, 2011 | 2000 Ford Crown Victoria

1 Answer

Oil is leaking into the gasket, causing one of the spark plugs to misfire. I have replaced the spark plugs, but fuel lines over the gasket prevent me from replacing it. How do I go about fixing this? ...


This is caused by a defective cylinder head cam cover gasket, this allows oil to leak into and fill the well the spark plug is in and short out the cylinder, replace the cam cover gasket.

Mar 05, 2011 | 2003 Ford Crown Victoria

2 Answers

Rough idle and stalls


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.

Feb 24, 2010 | 1993 Ford Crown Victoria

4 Answers

Cylinder 4 misfire on a 2000 crown victoria interceptor


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

Apr 10, 2009 | 2000 Ford Crown Victoria

2 Answers

TEMPUTURE SENSOR BLEW OUT


yes have replaced several plastic intakes due to coolant and vacuum leakage not a recall.

Dec 07, 2008 | 2001 Ford Crown Victoria

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