Bambam7

Well, I'l sure be glad when my engine isn't running crazy rich anymore.
I just took my plugs out to clean them, I've had them for MAYBE 6 months, with 5,000 kilo's on them
The was so much carbon I had to SCRAPE it off.. big nasty clumps!
Some probably almost a mil thick!! (metric !)
Anyways, I cleaned them up, and put em back in my car.
Wow- what a difference in smoothness!
Anyways- then I bumped the timing back to stock, and I can now definately say that the car makes more power when advanced about 5-10 degrees more than stock. 100% sure.
I left it because it was getting late.
After all that, I unhooked a vacuum line, revved it up to 2000, and let it suck in about a 1/2 quart of water... a bit at a time. Sure had steam out of the exhaust!
Anysways, I've heard it is supposed to clean up carbon- but since my plugs were already clean, I had no way to tell. My compression was good to begin with because th motor is only a year old...
Well, I guess it didn't hurt, but I didn't notice any difference.
I also cut the crush washers off the leading plugs.

Anyways- no real point to this post, other than "Clean plugs make things smooth", and "You get more power if you bump the timing up a tad!"
Later.

mazdaspeed7

Any luck with the hesitation? I am almost sure my hesitation was from running too rich top end. If that is the case(like it as for me), advanced timing will make the hesitation less noticable, while stock timing will make it very harsh. Are you running a stock fuel system currently?

tmak26b

Do running stock timing make the car run lean at the top end? My plugs are always tan when i change it, should i bump it up a little?

SureShot

Tan is good.
If it aint broke - don't fix it

mazdaspeed7

Tan is ideal for a n/a rotary. No need to mess with anything, it wont help.