OnlyGerman

First thread in a while, hope everyone is doing well.

Last time I changed my plugs were 5.5 years ago/~50k miles ago. Obviously overdue, so getting them swapped at my indy for $250. Have noticed a lack in acceleration, maybe its just me, or the car getting old...

Could this be related to aging spark plugs?

Has anyone noticed any differences after spark plug change?

Not having any other spark plug known issues... MPG could be better though!

As always, any feedback is appreciated.

Plutoe

I doubt that what you are calling old plugs would cause acceleration issues by themselves---now if you had misfire codes--you may want to have the coils and wires tested

cmriv

I sure hope parts and labor are 250 hahaha.... and what engine do you have.

cetialpha5

His sig says E350. I paid an indy about $100 to change my thermostat, idler pulleys and tensioner, spark plugs and air filter. I did supply all the parts though. I could have done the spark plugs though, but it was already all apart from the thermostat so it took him like 10 minutes.

kajtek1

With dual plugs they can last forewer.
I bought our E320 at 146k and since the car was dealer-maintained most of its life, I clearly assumed the plugs were replaced at 100k.
So some time later I took close look at MI I've got in the mean time and recheck that the code at 100k service was not plugs.
So at 156,000 miles I pull the plugs and the center electrode is not visible anymore-meaning they had to be factory plugs.
Regardless, new good plugs did not make any change and I compare mpg at each fill up.

OnlyGerman

Haven't notice anything since the change but I assume my mpg will increase slightly. Old ones looked normal for age so needed new ones regardless.

I also had my Indy reset the transmission adaptation since it did not seem to work the manual way (pressing gas pedal method).