Guest

I replaced the O2 sensor, the PCV value, and put in some fuel injector cleaner but I still have a rough idle. Any other suggestions??

DA-MAX

iTrader: (10)

spark plugs, wires, fuel filter, do the usual maintenece and I bet it'll disapear!!! if it doesn't after that I say fuel injector(s) might be acting screwy!!!!!!

Tom

Does you car idle rough in P or N, but smoothly in D yet runs smooth in higher RPMs?

Foo90SE

mine idles rough when in D or R, but semi-smooth in N or P. I think its either bearing clearances or bad o2 sensor on mine(going to test the 02 sensor theory over holidays)
Iv done plugs-wires-dist. cap-rotor button-fuel filter-PCV valve. and it didnt make any difference in idle quality. Not to say someone else wouldnt have different results..just my experience.

Spaz

I've heard that a bad EGR valve can cause that too.

speednsound007

yea, mine idles rough also in drive. After sitting at stoplights for a while the vibrations get so annoying i often put it into neutral where it idles smooth. I havent gotten anythign replaced to try and fix it though, no money! This summer I'm gonna do the O2 sensor tho because I am barely getting 300 miles to a tank.

PJ

Foo90SE

hehe..yeah mine does that too...it isnt too bad when i first stop but it gets to numbing stage pretty quick
ill let ya know if an 02 fixes it.

John van de Pol

Check your fuel pressure regulator. It's there to enrich your mixture on acceleration, and it is vacuum controlled. If it's malfunctioning, it will give the engine too much fuel pressure resulting in a too rich mixture and rough idle.

John

Guest

its an 93 SE auto that only idles rough in D. I have replaced the fuel filter too. Is there anyway to test the coils, EGR valve, or fuel pressure regulator?