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another ltft/wtf's wtong with my tune

M

mskram1

New member
Ok I kno this ones been posted to death so sorry in advance... ok first off my mods are cai, headers, 3.4, overkill tune hs1.9's, intense or pushrods still on stock springs for the moment, so the problem is my ltft's, kr and maybe timing... at idle my ltft's are 16.4 and timing is 27*... on a wide open run timing goes from 27* up to 35* then the ltft's and timing start to go down steadily and at wot I'm at 5*kr, 2.3 ltft's and 16* timing... I have no kr unless I'm goin wot but then its 5* so I'm confused all brand new vac lines, new aluminum lim gasket sc gasket and o'rings so maybe fp or bad overkill tune(dont believe it)
 


If you are getting 5* of knock and at the same time have 16* of timing, that means your timing in the table is 21*. Your 2.3 ltft is well within the accepted range of +/-5%
 
Re: another ltft/wtf's wrong with my tune

Sorry 35* is at about 1500 rpm, 27* idle, 16*wot and 11* when its trying to stop 5*kr... so what ur sayin blue is that I could have a vac leak causing me to lean out ultimately causing my kr??? And are my timing readings safe for my mods I have no kr till wot and its only an overkill tune for my 3.4, headers,intake, egr and rear o2 delete... haven't quite tuned for the rr's yet but I had the same problem before I put those in... oh and this thread got posted twice could u delete the the other one please...
 


Checked vac lines... huge blowout on my lim line idle ltfts got a little better still sittin at about a 16.4 to13.2 and as close to wot as I felt comfortable id say about 4500 rpm it was set at -1.5 ltft 2*kr and within +/-4% of 0 so I'm gonna get an fp next week and hope that solves it... unless someone has any other suggestions... its got a new fuel filter so its not that unfortunately
 
Hey billboost if my ltfts are ok then my kr is comin from too much timing??? I'm still getting kr and 16.4 idle ltfts after vac lines were replaced probably about 30miles ago lol
 


not throwin any codes but when im just driving no wot runs my o2 millivolts bounce all over the place and sometimes go as low as 30 and as high as 920 and everywhere in between... i did have to wire my own o2 extension but its soldered not crimped, u think that might cause all my problems??? ipw's start at 2 and go up to 16ish when the kr starts if that helps any... ltfts still start at 16.4 and then at 2k rpm it sits at -.7 to .7 anything higher its 1.7 to 4.5 lower than 2k its anywhere from 16.4 to 7...
 
also something new ive noticed when scanning the misfires right after startup cyl 3 and 4 miss like crazy but stop completely as i start driving
 
went vac leak and false kr hunting today... where does the really long line coming from the center port on the sc vac tree and looping around the pass side strut tower then following the wiring harness the rest of the way under the car go??? ac or fp??? oh and i tightened my egr to header block off plate and now my ltfts are always 0 at all rpms in park
 
New development... now my aeroforce isn't showing data for ltfts or maf and I have p0102, p0122 and p1646 wtf... it has to b in the wiring because I just got a new maf after it started and that didn't fix the code
 


ok fixed the misfiring and missing data... maf fuse:) still running a 16.4 idle ltft and 0 at wot, with blips of what im guessing is part throttle kr of 2.5* to 3.5*, p0171 and a disconnected evap(still has vac lines just unplugged to be always open)... havent been able to get the fuel pressures checked but i did just finish cleaning my o2 sensor with a little soaking in gas but i havent been able to test yet...
 
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