5.4 motor issues in Lincoln Blackwood - Ford Truck Enthusiasts Forums

5.4 motor issues in Lincoln Blackwood

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Old 06-15-2009, 10:50 AM
donarmstrong58 donarmstrong58 is offline
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5.4 motor issues in Lincoln Blackwood

I am having trouble isolating the problem with this motor, I was running down the interstate got on it a little bit and she stalled. I changed all the coil packs and placed new plugs. Which was long overdue; based on the code reading random misfire cylinders, the cats got hot so i replaced them on Saturday. Still nothing. Cleared codes and now truck starts better runs like its missing and the cats on the passenger side get hot quick , so I shut her down....but no codes came up...talked to Ford and they indicated a EGR problem would cause no computer codes...........looking for an answer .....can anyone help.....??
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Old 06-15-2009, 02:05 PM
galaxie641 galaxie641 is offline
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The actual codes could help.
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Old 06-16-2009, 08:59 AM
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Start by changing the fuel filter.
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Old 08-04-2014, 06:51 PM
bobalew bobalew is offline
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Bad Bank fire codes? One bad Cyl, or Cyl misfire?

Look at the top of your Air plenum where the EGR valve & Vacuum advance valve connects to the Intake manifold, Right at the top, Under the windshield wipers. Ther's a Right angle rubber connector boot that attaches directly to that vacuum system. There's your leak! Find a silicone rubber Spark plug boot & replace it with that. Trust me, it's weird, but it fits. Otherwise, get few varied diameters of Hoses & hose clamps & replace it with that. This error drove me nuts until it flat out failed. The Alcohol from your windshield washing fluid, deteriorates the rubber on this part, creating a slowly increasing vacuum leak. and Varous BS error codes. This miay also explain the extra oxygen in yopur exhaust, causing calalytic converter overheating. ( SDo that what that HOT smell was...). Any way sorry to let you know tyou spent wat y too much money on fixing it, My fix cost me $8.57 at the local NAPA parts store, & would have been free, if I'd have thought of the spark plug boot fix...
REgards, Bobalew
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