To change out spark plugs or not...

[99Mystique ATX]

I was looking through the service records of my SVT that the previous owner gave me and saw a receipt for a tune-up which consisted of plugs, wires, fuel filter and cabin air filters. Car has a K&N air filter which is why this wasn't replaced. Anyways, they didn't list what plugs they used but, all 6 only cost $19. So, i'm somewhat concerned as to what they used for plugs. They charged the guy $95 for cheap-o noname wires. The car has 114k and the service was done at 100k.

The car does not have a missfire or anything like that and actually runs very well. But, I am concerned that they used crap plugs in it.

Although, my gas mileage has been very good lately in the SVT, usually getting 27-28mpg commuting back and forth to school and 30ish on longer drives.

Maybe i'll pull one plug just to see what they put in...

 

[Tony2005]

If the plugs are "crap", you will get a misfire. If the car is running fine, don't mess with it (or your head).

 

[elraido]

I have to agree with Tony on this. If the car isn't doing anything yet, leave them. If you get a problem later one, check them out. I was about to do the same things in my fiances car, the previous owner put in Bosch split fires but it runs fine so I left them.

 

[SVT3C]

I also suggest leaving them in because they seem to be working fine. But if you're curious just pull one to see what it is. Probably autolite platinum though.

 

[99Mystique ATX]

Sounds good, I guess i'll leave them for a while... Thanks!

 

[Big Jim]

Even a "junk" plug will probably last 30K miles.