The 93 Fleetwood started running a little rough earlier this week - idle became rough, not as much power as usual, etc. It was a regular throb that varied exactly with the speed of the engine. I figured I was missing a cylinder or something - definitely an ignition problem - it was too regular/consistent to be fuel delivery on a TBI car.
I have recently changed the distributor cap, rotor, and plug wires, so it was time to go after the plugs themselves. Had to wait a day for Advance Auto to order in AC Delco platinum plugs (OEM replacement), but at least they could do it (Autozone couldn't get them).
Was worried I couldn't get it done this weekend due to a big cold front and then the remnants of hurricane Ike, but Saturday turned out to be a great day, so I got under there and changed them all out.
Here are the old plugs - cylinders 7, 5, 3, 1 and top and 8 through 2 on bottom:
Looks like cylinder 8 was my problem. Car runs smooth now!
Next on the list is a coolant flush - it's looking a little dirty in the overflow reservoir.
Yeah - it's not consuming any oil that I can tell. I wonder if the amount of oil getting through is a problem, and if there is anything I should worry about / address in the near future.
The next maintenance item on my list is the coolant flush - dang this thing takes a ton of coolant (14-16 quarts!). I'll have to pick up a few jugs of distilled water on my next trip to the parts store, and get some of those supplement pellets too.
Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
Re: Replacing Spark Plugs
Antifreeze becomes corrosive over time regardless of color. 2 year interval changes are recommended to keep this from occuring. The use of the sealant pellets is recommended especially on the Olds engine. They had a tendency to corrode the aluminum intake where it joins the cast iron cyl. head at the front or rear corners because of late antifreeze replacement
Yeah all I did was drain the radiator/overflow and refill essentially. I started to find the knock sensor and block plug to do a full system drain/refill but got lazy. I figure the radiator flush is enough preventative maintenance for now, though I've heard people theorize that if you just do that every year it's almost as good as doing a block drain/refill every 2 years.