I bought a 2000 crown victoria police interceptor with a 4.6 v8 and after a day the engine light came on, so i took it to get checked and it said that cylinder 4 had a misfire. the car only has 98k on it and it runs very strong but i do feel some roughness accelerating. any tips or thoughts about what i can do to fix the problem?
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
98 crown viclx...just had new intake manifold installed...the old one ofcourse was cracked(class action lawsuit--ford is suppose to reimburse us w cracked manifolds--$734)...next---cylinder # 6 misfire--..had new coil installed)....now----2 days later,...cylinder #4 misfiring!...cheeeeezze!----Fix Or Repair Daily==FORD...my second crown vic...I like these Panther Platformed cars very much!...so, i havent repaired it yet....it runs///terrible...but it runs////blinking check engine lite...then..the lite shuts off////then blinks again...then shuts off...(heh..heh)...maybe best to just get up off the cash and have all plugs, coils, injectors replaced...it has a newer tranny...rebuilt steering components...newer fuel pump...other than this blitz...of malfunctioning parts, the car has been very reliable over the past 5 years!..i may as well keep it...but..when will the parts quit malfunctioning---(one part per day)...??!
Try replacing the spark plug on that cylinder also check spark plug wire, it may need cleaning with a small wire brush on the contact. Also check to see if it is gapped properly.
Bad fuel injector???
Engine Misfire diagnosis can be complex and there are many reasons for misfires to occur. I suggest you read the article at this link that deals with engine misfires and the diagnosis of them and possible solutions to repair them.
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