can an exhaust leak cause a rough idle?

 

u and i both want to know this one

 

same here

 

same here !

 

lol we all have exhaust leaks and all have bad idles on our cars
anyone else?

shawn
90 N/A Vert

 

haha, yeah. if a leak can actually cause a bad idle, i'll spend the time to fix the leak

 

lol
ok would anyone with a good idle would like to go loosen the exhaust bolts and tell us if there idle changed? (i prefer someone with an n/a s5)lol

 

I have an S4 and had a small exhuast leak where the precats connected to eachother. The pipe was rusted enough that it made a small hole, but anyways my idle was fine back then.

 

damn anyone know with an s5? i am hopeing its just an leak and the idle is rough cause of lack of back pressure r something related to that

 

shouldnt be because i had one of my mufflers off for a while and no messed up idle then .... big loss of power and back press. though

 

i'm talking about a leak before the main cat, mabe even the pre cats......... it might even be the manifold that is leaking on mine

 

manifold leak maybe but right now im wondering ur question too i have a leak at the main cat seeing thatz the only cat i have

 

I had a leak after the manifold, at the first pre-cat. Idle was good.

 

j-rat s4 r s5? r it dosen't make a diff. which series it is?

 

I wouldn't think the series would make any difference.

 

well does anyone have the answer to our question or what?

 

I have a series 4 with about 16 holes in it, starting at the main cat all the way back, idles rock solid at 750

 

lol sonic,

i have a leak right somewhere by my turbo or downpipe. can't diagnose it. Start the car and it has that really annoying noise, crappy exhaust leak. Gets really loud at 2-4 and then i can't hear it anymore. Ever since it developed it feels like my car is loosing power once boost hits. like not enough kick in the pants there anymore. getting the full exhaust replaced with 3inch mandrel bent single from the engine to a reactive muffler

 

S4

 

NO

Exhaust leak can not affect idle.

Intake leak can. Bad TPS can. Clogged filter and/or AFM can. etc etc......

I had MASSIVE exhaust leaks (exhaust manifold AND turbo were cracked like a ****) and the idle was perfect. TID cracked, or filter was slightly clogged, or the TPS out of specs, and the idle would bounce a bit (not much though....)

 

everything after th turbo is restriction, so get the **** rid of those cats, pre-cats, mufflers etc