Erizo

Replaced Plugs Wires and coils. Cleaned MAF sensor. Shot TB Cleaner through the maf sensor hole to the TB. Will take off TB completely Tomorrow. Also next is cleaning the ECCENTRIC SHAFT SENSOR. Any Other Ideas?? the Car Basically Starts fine and everything it is just when the rpms start getting close to normal Idle when the car is warm it starts shaking really bad. The steering wheel rattles amongst other things. The needle sometimes "very rarely will drop to 500ish rpm" then climb back up.

Yes I have used the search button. Should I post a video?

Erizo

Also I want to add acceleration seems fine. It is pretty smooth accelerating 0-60 it is just the idle is not good. I also tried the 20 pump Brake reset to see if that would help.

RIWWP

iTrader: (2)

Is the RPM itself fluctuating? or is the RPM holding steady it just vibrates a lot?

RX8Soldier

iTrader: (24)

Year of car? Miles? Mods? MT/AT?

When you say you did the 20 brake stomp, did you do complete it successfully? (ie did you see the oil gauge sweep)
I'd also be suspicious of the motor mounts.

Erizo

It will hold steady most of the time when holding steady it vibrates. Also If I rev it and then let go it will drop down then dip a little bit more then slighty go back up and then vibrate. Yes the oil gauge did sweep.

2004 Rx8 35000 Stock MT

Erizo

I am thinking that just because I shot the TB fluid through the hole instead of actually taking it off and cleaning it there is no real way that I know that it is clean..

tpb7463

iTrader: (1)

Correct. Take the hose off and get a helper if you really want to clean it:

But really, at that mileage I would doubt the TB is the culprit. It can also be motor mounts, low fuel pressure (failing fuel pump) or clogged injectors.

Erizo

I have a bottle of trchron in it now. Hope it clears it up

RIWWP

iTrader: (2)

Vibration with the idle stable = motor mounts
Vibration with the idle moving around = combustion problem (vacuum leak, O2 sensor, MAF, ignition failure, compression loss, etc....)

Sounds like your motor mounts are going because your idle is stable, even if it dips a bit more than normal.

Cleaning the throttle body to smooth out a rough idle due to motor mounts is kind of like washing the dump truck to see if it drives down the unpaved road any smoother

Erizo

35,000k is normal for motor mounts to go out?

monchie

I don't know, but i have 40k miles and mine does not shake.

MadCat360

Check the main ground wire plug (the white one, I think, near the front). If it's only grounded through the starter it might idle a bit rougher. Yours sounds more extreme than that though.