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I would say most likely the ignition coils are bad
The dealer made their money when they sold it to you
They can fix it, but don't have very high standards for the
techs or no supervision,something !
Almost half the people that come to this site can't get a vehicle
even diagnosed at a dealer
The technology is passing everyone by
You have ignition coils on each cylinder
They only last about 6 to 7 years & will go
into failsafe if they misfire bad enough,that
is called a Class A misfire,you won't pick those
up in the shop with test equipment,maybe on a scope,
but I doubt many mechanics use one or know how
Have to just walk a new coil,road test or replace the coils,
when you have those issues
The main problem is vehicles are only driven
Never tested during the year & no one knows
that you have to do anything other than change
the oil & wait for them to break down & that is what
is happening
I would change all the ignition coils 6 or 8, replace the
front oxygen sensors & clean the maf sensor & replace
the spark plugs every 3 years,those I would have done
the week I bought it
I hope you changed ALL the fluids, power steering,trans,
brake & rear axle.
Need to road test with a professional scan tool to look at all data
& look at cylinder misfire count,fuel trim & see that the 8 monitors
run clear,you need them okey, in order to go to inspection & pass
Battery is either discharged severely, and/or the battery needs to be replaced. This is the likely cause if the battery is 3 years or older or the car is driven infrequently.
Try to take the battery or the vehicle to a battery retailer which can test the battery to see whether it is good or bad. If it is bad, then replace.
If battery is good, and connections are clean and tight, then the starter may be going bad, but this is unlikely on Cadillacs of late model years, in my experience.
You might try parking as dark as you can, letting the engine idle and check under the hood for errant sparks due to decayed ignition/plug wires.
GM saves money in some of the oddest places and I had to install new plug wires after only three years but Caddies are built so much better, right? Well, my first, a '49, did take a beating with few problems.
I got a 2004 cadillac cts with 130 thousand miles and I'm getting ready to give it a tune up. do the valve covres get filled with oil?? where as i would have to replace them too??
open trunk, remove the plastic panel around the latch plate, remove the plastic mounting bolts that hold the grey trunk liners in place, there are two 10mm nuts that hold in the light remove nuts pull out light twist the bulb retainer out and replace bulb.
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