Any suggestions, did some work on my 2g now reading really lean.??

[JoEgsX90]

Ok so problem is now im running lean at idle wideband reads 17.3 i believe. Well i did a new oil pan on my 6bolt, also changed the o-ring on my oil cooler (leaked) I went ahead and put in my buddies big16g because my old 16 got messed up. Im hopping it even spools because has shaft play (nothing really crazy dangling) but not stiff at all. Anyway i have a wideband thats in my rear o2 sensor at the moment that i had there for almost 6 months now. I also went ahead and replaced my front o2 sensor because i was running rich and wasting ALOT of gas! so picked up one on here used. When put put the exhaust back in i shouldnt of but i used my old o2 gasket(didnt have time get new one) Also right before wideband rear o2 where the downpipe is, I had to make a gasket doupble it, I have done this before and did not leak but u never know. Im wondering if theres exhaust leak will the wideband read lean???? Let me know what u guys think. I have now taken the car out just idled it untill car was warm still have it on jack stands, making sure nothing is leaking.

 

[Gamble97]

I had this problem. If there is an exhaust leak BEFORE the wideband it will read lean. Also if the o2 is going bad it will read lean.

 

[snowborder714]

Yes, an exhaust leak will cause lean readings.

 

[CrazyboostinTSI]

check your base fuel pressure at idle with car warm vacuum hose off set it, put the hose back on, what do you have metering your air for the 16g

 

[CrazyboostinTSI]

plug the vacuum hose with your thumb of corse

 

[banshee04]

Yes, an exhaust leak will cause lean readings.

+1. Thats what happend to me.

 

[JoEgsX90]

its Raning the rest of the day, ill chek more things tom. Well I believe my old o2 sensor was bad before i did all the work and it was reading really rich all the time burning so much fuel. I thought o2 sensor bad it will run rich (thought ive heard that) Didnt know it could run lean with the o2 going bad. On my logger on my old o2 was reading a steady 0.05 at idle.. So i replaced it with a used o2 sensor got off here. Havnt cheaked with my logger yet, so have to tomorrow. (But im glad that so far no leaks on the pan and oil cooler!!) But Mayb it is leak not to crazy bought the gasket i made, i used this high temp gasket paper that i have used and worked actually really good with no leaks. Crazyboostintsi i have stock 2g MAS

Im going maybe take it out tom, should i attemt to even with the wideband reading 17.1 and see how it drives. Any risks of me doing that. I have a SAFC zereod out across the board with STOCK injectors and 190 reqird fuel pump... Broke in my motor last summer and winter came so never put in new bigger injectors.

 

[JoEgsX90]

update fixed a exhaust leak on my downpipe to o2 housing... now its reading about 15-16 on my wideband.