SOURCE: which ignition coil is bad?
I went thru this on my 2002 LS as well.
I replaced one ignition coil at the dealer - only to get the same misfire code on another cylinder. After a little research found out is actuall a gasket/o-ring problem design of the block. Spark plugs are deep in the block - under the oil - which is why they are supposed to last 100,000 miles. But the o-rings start to leak some where between 65k-85k miles. Coils go bad because of oil contamination. If you don't solve leaking oil problem will have to replace coils again - but sooner - because leaking oil will be progressively worse.
Cost - 8 ignition coils
set of spark plugs (who knew they were that expensive
and a ton of cash for the labor to tear down the top of the motor
SOURCE: acceleration problems
Take off the inner fender well lining on the front driver side of the car. The fuel filter sits by where your left foot would be if you were sitting in the car but in the fender well.
SOURCE: 2000 Lincoln LS v8 engine missing
Most likely what has happened is that when the thermostat went out the engine over heated and the seal of the valve gaskets to the plastic valve covers got warped and you ahve oil the has dumped into the coil pack area and it has caused 1 or more of the coil packs to go bad as solution #1 has explained. get the gaskets replaced, it sounds like your husband is handy. Its not a difficult procedure just a little time consuming. research the coil packs because at the dealership they are very expensive. People have had alot of good luck buying them on ebay.
SOURCE: 2004 Lincoln LS won't accelerate at 60mph, dies
Why would a dealer not be able to find the issue?
Start by checking codes.
If you have to, drive with a scanner,not a code reader on it,to capture data.
If it only has issues when turning the steering wheel and is speed related with the turning, you have a place to start.
I assume the dealer did all that.
I have a 2004 V8,so let me know, what help you need.
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