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STILL running lean..why!?

BwolfGT

BwolfGT

New member
Well I've still got the rough idle issue and it's throwing a "system too lean on bank one" code. Thought I had a bad MAF, so I replaced that, nothing. Any ideas?
 


something to read LTFT, o2 levels, and other things that you NEED to know with your swap. get on that NOW.
 


scan tool is a lot cheaper than a new motor
It could also be a bad 02 contributing as well...no way to know unless you are scanning.
 
99% sure there's a horrible vac leak somewhere. All symptoms point to vac leak and it's idling at 1k.
Wouldn't an o2 throw a code?
 


mine threw that same code because it was missing the maf screen. i put 1 in it and its never come back on ever since. the maf wasnt reading correctly.
 
a98gtp4u said:
mine threw that same code because it was missing the maf screen. i put 1 in it and its never come back on ever since. the maf wasnt reading correctly.
Click to expand...

Really? No I don't have the screen, but it's been doing fine without if for about half a year now.
 


well i removed my screen and next thing u know i was throwing a code saying running lean bank 1, obviously the air coming in wasnt being read correctly by the maf and it had a rough idle. i put it back in and no probs since. try it out, put 1 in it and c what happens, cant hurt.
 
First thing I'd do is toss el screeno back in. Some cars complain and toss codes, some don't. Being that you are getting a code, a screen is an easy thing to try.

Next thing is ....do you still have an EGR tube going to the LIM? They crack pretty easy and you'd have to pull it off the car to check it. Can't tell you guys how many lean banks have been solved by the tube.
 
BillBoost37 said:
First thing I'd do is toss el screeno back in. Some cars complain and toss codes, some don't. Being that you are getting a code, a screen is an easy thing to try.

Next thing is ....do you still have an EGR tube going to the LIM? They crack pretty easy and you'd have to pull it off the car to check it. Can't tell you guys how many lean banks have been solved by the tube.
Click to expand...

Alright thanks, after I break out the brake cleaner and check for the vac leak that I'm pretty sure is there and fix that, I'll try both those things if the problem isn't solved. Odd that the screen would cause it though, I took that out when I installed my FWI so that was about half a year ago and I've never had a problem.
 
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