Shlooky

I had my plugs changed by a local indy shop and noticed immediately that the car guzzles more gas. Not sure what specific make the plugs are.
Any ideas? Bad plugs?

Thanks

jaycal3

Had my plugs changed recently - within a 1000 miles and gained a bit.... a lot of it is driving habits though - more traffic? Heavier skinny pedal... these things will decrease your mpg. I am assuming you reset your mpg's and have been watching?

healthservices

Is this after going through a new tank of gas? Remember the car may have been sitting, idling a lot wasting gas when it was at the shop.

Shlooky

Thanks for the replies, I forgot to mention that I did the change a month ago and been monitoring it since. So I filled up a number of times and been resetting the litres/km every fill up, and did noticed a jump.

Will continue to monitor. Wonder if the make of spark plugs have something to do gas consumption. Could it also be the weather? My e39 back in the day would consume more gas in the winter than summer. Perhaps my e60 is the same.

AchtungE60

Did they reset adaption values afterward? This will make a difference in what you notice. Car may run rough for the first 25 miles or so and may throw errors all over the place. None are to worry about unless they set adaptions when engine was running which is a no no.
If they didn't do it, I wouldn't worry about it, you wont notice much of a difference for the first 1000 miles anyway.

BMW535xia

what is the reset procedure for mpg? outlined in idrive? owner's manual? thanks.

AchtungE60

I was referring to adaption values and that can only be done in INPA or SSS. Perferrably SSS. It will set your engine's values to a value of 0 because your engine and all modules have learning capabilities. You can reset your consumption on iDrive and maybe that will reset the algorithm.

BMW535xia

yes, and thanks. i was referring to resetting "consumption" in the idrive. do you know the procedure, or is it in the owner's manual?

jaycal3

There is no procedure to reset the mpg, its pretty much like any other car. In my car its selectable on the turn signal stalk and once on the mpg display bon the dash I hold the "bc" button until it resets to zero... I can also access it through the "Car Data" screen in the idrive. Once there you select consumption and it asks you if you want to reset.

pjinca

WOW, when I changed my plugs I instantly gained 2.5 mpg, it has leveled off since to about 1.8 mpg gained. Can't imagine LOSING mpg with new plugs. BTW, I used Bosch Platinum +4 - same as came OEM on my car