disclaimer: I tried searching and didn't find a thread with same exact sympoms as i've seen. i didn't have 4 hours to scour the threads so i'm asking for help.

problem: when my engine (stock VIII except for IX blow off valve) is idling, it has a slight fluctuation that started a few days ago for no particular reason. when I drive, it seems to run fine. when I'm stopped at a red light I can hear the murmur again. it is consistent, not wild and usually idles at 900ish

any help is greatly appreciated. please only reply if you feel you have the experience to know a solution

 

does it happen after driving at constant speeds like highway driving,or does it happen once you start the car and all thr time

 

you have no mods no exhaust no nothing other than the bypass valve? how many miles on the car?

 

almost 70k miles, no mods but the IX valve, and it happens after i start engine, at red lights, when i park at home, anytime its idling

 

Do a boost leak.

 

havnt had the chance to check on this for a few days. could you explain what it means to do a boost leak

 

considering you have 70k and you havent modded, im gonna take an educated guess and say check your EGR for loose vacuum hose

 

I second. If no modding has done is has to be a vacuum line somewhere in the emissions setup under the hood, behind the intake manifold, or it is a boost leak at a coupler somewhere.

Ted B did this a while back. You don't have to use welded nice parts as he did, many people use PVC and it works just the same.

 

sorry "boost leak test" https://www.evolutionm.net/forums/ev...g-how-why.html

 

Click here for a boostleak tester - PPI

I use this and they are really good.

best of luck!

 

wow so much information. thanks evo g8, cfdfireman1, buchnerj and mifesto

ill letu guys know what turns out

 

yup im betting that the green striped vacuum line came off the egr

 

so I finally got her to the shop, turned out to be running rich due to a bad O2 sensor. expensive

 

oh that sucks.. like 400ish right

 

do you not have a a/f ratio gauge, if not id invest... you would have known the reason for your problem a long time ago