Quote:
Originally Posted by spools420a
i never like to leave dead end threads for those who have the same issue the fix was fixing the exhaust leak pre o2.
what happens is your engine creates pulses at idle these pulses suck in and blow out air and exhaust gasses,so when these pulses accure your getting fresh air drawn into the leak which the o2 then sees a lean condition,
if you have a lean idle that goes away when you increase rpm suspect either exhaust leak like i had or vacuum leak/boost leak,a vacuum leak will cause identical condition because you are at most vacuum during idle and the more rpm the less vacuum which means less vacuum leak of unmetered air drawn in bwith increased rpm.
best method for finding both type of leaks is building a homemade boost leak tester thats basically a coupler with pvc cap and tire shrader valve installed in it so you can pump air into the system and find leaks,beause there are countless videos and threads on this topic just youtube "diy boost leak tester" and you can use this to also find exhaust leaks by installing it on exhaust tip.
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Actually I should post my vacuum leak tester DIY part numbers... I know there are a lot of DIYs, but it never gets too specific enough.
Question for you, when I did my leak testing, from what I can tell, it actually doesn't hold air, you just have to listen for leaks or spray soap right? I had to cap off my electronic boost solenoid....