Korupt28

Hi Guys, I just wanna say thanks in advance. Im looking for your help. I own a 2005 MT6 with 57720 miles on it. Spark plugs, coils, wires were replaced about 2k miles ago as well as the decarb service bulletin performed by dealership.. Oil and trans fluid replaced this weekend..

My question is, when I turn my car on from a cold start it idles at the usual 2k but after a few seconds the RPMs would go from 2k down to 1.5k back up all the way till it warms up... Even after it warms up and driven when its idled it still does the same but at much lower rpm.. my guess is 1k to 1.2k.

Few my buddies told me it could be my throttle body sensor. Honestly I dnt know much about vehicles. Im an aircraft mechanic but when it comes to vehicles I dnt know much. I wanted to get some opinions from rotary owners before I did anything. Thank u very much!

jasonrxeight

didnt we answer that before?

Korupt28

negative. all I was suggested was clean MAF, and check plugs.. which I did.

RotaryResurrection

iTrader: (3)

Remove throttle body and clean the blade and body gently. Push the blade open by hand and hold it there, moving it slowly and as little as necessary. You can either sandblast it, or use several cans of carb/brake cleaner and some rags.

This will remove the carbon between the throttle plate and body, and restore lost clearance between the two, allowing the proper amount of airflow for idle.

Otherwise you may have a vacuum leak somewhere although this is fairly unlikely given the rx-8's intake system and lack of significant number of vacuum hoses.