Thread: crazy ltft and wideband action

alright guys im kinda stumped here...

had a pretty solid tune the last month or so and lately my car has been freakin out. Ill be driving along and my ltfts will shoot up to like 16.4-20.3 range with the wideband reading 10.4-11.0... then ill accelerate/decelerate... resume... and itll be back to normal...

then when im at idle itll be doing the same thing while sputtering and having some misfires in the 2 and 4...

then reset itself and run normal...

any ideas? i cant figure it out...

thanx,
jarred

Why people dont read stickies is beyond me...

look at the thread at the top of the page that says "removing your rear o2 sensor, things you should know, aka read this thread"

Read it Bro...

I'm no noob so don't be a Dick I've searched the hell out of this...

I know that you think it might be a tuning issue...but have you checked everything else? Plugs/wires/coils/ICM/plug gap?

Originally Posted by darkhorizon

Read it again??

You removed the rear o2 sensor on a 01+ car and you have cat tests running... Its obvious....

I have a 2000 pcm... that I got EXACTLY for that reason...


and Nick, the reason I think its something in the tune is because it somehow comes back to normal... if it was something mechanical wouldn the problem constently pursist?

now that im thinking about it I haven checked for an exhaust leak...

Originally Posted by darkhorizon

Try running open loop for awhile and see if it does anything weird. Could be the o2 sensor failing.

oh good call ill run that for a couple days and see and check back...

got it! its gotta be the evap...

damnit!

so evap leaks can cause the ltfts to go crazy liek that? I currently have an evap leak and my ltft;s are weird as well.