finally boosted but....
10-03-2013, 10:45 AM
#31
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no i understand. i been trying to get ahold of nelsons all morning no luck. my buddies in town has hp-tuners but since the pcm is locked all we can do is read and logg. im going to try and get some logs this afternoon and ill send them to allen and post them on here. i put in the 1-bar and it runs worse. in boost the afr is good. but if you boost say 2-3 psi and just let off the gass the afr goes to 20 and the truck shutters alittle. and if i come to a stop i gotta mess with the gas to keep the rpms up so the AFR is good and the truck doesnt die. its throwing a po171 and po174 codes but only at idle and deceleration. i can cruse it fine but any little change in the gas pedal and it goes lean.
10-03-2013, 05:05 PM
#34
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High ltrims.
Common causes, huge vac leak or bad maf.
o2's appear to be working correctly.
if you need more detail or suggestions on troubleshooting, contact me thru email.
Common causes, huge vac leak or bad maf.
o2's appear to be working correctly.
if you need more detail or suggestions on troubleshooting, contact me thru email.
10-03-2013, 09:19 PM
#35
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the AFR in boost is running about 11.5 ish as far as a vacuum leak im not sure were one would be? i never took off the intake and the truck ran fine before. iis there a way to test the MAF? it was working fine before as well? im not sure what i need to do? retune?
10-05-2013, 05:48 PM
#40
it sounds like your tune for the injectors is not where it should be. when coasting its suppose to go lean because its in dfco. if the injector pulse widths and adders are not correct they will basically mis-fire at light loads and cause lean ruff idle situations. under heavy throttle it will be fine becqause they are required to be "on" long enough that they wont mis-fire. really short pulse widths is where it can get tricky if the offsets are not correct. also if its tuned for 2bar and you have a 1 bar installed it will not run right. the maf being connected while running 2 bar shouldnt matter if its tuned correctly because it should fail the maf right away.