hello, so i change the ignition coils, sparks plugs, ignition wire couple months ago. Finally save up enough money for engine mounts. Did them this morning but still shake(idle).

NO CEL is on.

Been having real shitty luck, hate that it pass on to my 8.

2005 about 73k on the engine

thanks in advance bm

 

If the idle is smooth but the car is shaking, then yes, it's your motor mounts.

 

shakes at idle, not smooth. i bought new oem mounts but still shake

 

How steady is the RPM needle at idle?

 

steady but when it drops below 1k shacking begins

 

I'll try a 3rd way of asking the question:

Your car is supposed to idle at 850rpm. When the shaking exists, is it holding at 850rpm? Or is it fluctuating even slightly? Or is it at some other rpm?

 

let me make sure right now, 2 mins

 

steady stays at 850 rpm

 

 

So the shaking of the car is not the engine itself changing speed.

The only other option left is that the shaking of the car is from the natural vibration of the engine being transmitted to the chassis.

I.e, motor mounts. If you have new mounts in there, are you sure they were installed correctly?

 

yea i follow the diy step by step. Thanks man for your help, am going to take it to one of my buddy in the afternoon. I call the dealership they wanted 100.00 to check it out. Is it like that everywhere? thanks again

 

Yeah, standard diagnostics fee runs from $79 to $110ish based on the dealer.

I'm pondering other methods for the idle vibrations to get through to the chassis, and coming up empty.

 

Are we missing some more information here? Based on one of your older threads you mention that even though you changed your coils/plugs/wires/etc that you got misfires?

https://www.rx8club.com/series-i-tec...please-244902/

 

a thought,

Clean the MAF, Clean the ESS, 20 brake stomp. You may need a few drive cycles for the ecu to re-learn your motor.

Then, look at grounds.

 

mine does this too, in my case its the engine, but i would do the ESS clean and reset

 

I was an idiot back then, still now lol. it wasnt a misfire. thanks for your respond.

 

thanks man am going to try all of them now.