Got it to run and start up good with no ac. if the ac is on when I start it it fumbles a little then dies. have to keep the foot on the gas to keep it running. Once I get moving it runs great and no more problems. What should I be looking at? Dont think the RAF needs to be messed with since its running/idling great without AC. Tips? Suggestions? Coments?
99Z A4 w/ SS LT's, h/f cats, magnaflow catback, port/polish t/b, egr deleted, ls6 intake, lid, 3.73's, hpt, performabuilt level 1 tranny, 3600 stall, Stage 2.5 (5.3 heads), Torquer 2 cam, 42# reworked injectors, TR6 plugs.
2007 Avalanche LTZ - Catback and Eibach springs
I bet IAT relocation could help this. Easy enough to try.
I was thinking that too and did a little research on it. What does not make sense is that it only does it with the AC on. If that was the problem with a heat soak shouldnt it do it if it's on or off?Originally Posted by jimmyblue
99Z A4 w/ SS LT's, h/f cats, magnaflow catback, port/polish t/b, egr deleted, ls6 intake, lid, 3.73's, hpt, performabuilt level 1 tranny, 3600 stall, Stage 2.5 (5.3 heads), Torquer 2 cam, 42# reworked injectors, TR6 plugs.
2007 Avalanche LTZ - Catback and Eibach springs
Are you getting the correct ac airflow added to compensate the extra load?
2003 Chevy Silverado Daily Driver, 408 Iron Block,
LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.
Dunno. Where am I looking to see that and or what range should it be?
99Z A4 w/ SS LT's, h/f cats, magnaflow catback, port/polish t/b, egr deleted, ls6 intake, lid, 3.73's, hpt, performabuilt level 1 tranny, 3600 stall, Stage 2.5 (5.3 heads), Torquer 2 cam, 42# reworked injectors, TR6 plugs.
2007 Avalanche LTZ - Catback and Eibach springs
Looking at the log It is alright for the first 3-4 seconds. Then what ever it is (guess Decay??) pulls that startup airflow from it causing it to die. Like I said without AC on its fine, or if I give it some gas its fine. I believe it need more air, the question is what do i screw with or adjust that only will change the start up with the AC on? Dont want to mess with something that will then screw up my start up with AC off since that is running good.
99Z A4 w/ SS LT's, h/f cats, magnaflow catback, port/polish t/b, egr deleted, ls6 intake, lid, 3.73's, hpt, performabuilt level 1 tranny, 3600 stall, Stage 2.5 (5.3 heads), Torquer 2 cam, 42# reworked injectors, TR6 plugs.
2007 Avalanche LTZ - Catback and Eibach springs
Are your ac idle trims maxed out? If so, you'll need to add more airflow to the ac tables until your trims are lined out.
2003 Chevy Silverado Daily Driver, 408 Iron Block,
LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.
here is a cold start with out ac on and second one with ac on. cold start is no problem. after i started and the rpm leveled i put it in drive and still no stall. will do a log later with it hot.
99Z A4 w/ SS LT's, h/f cats, magnaflow catback, port/polish t/b, egr deleted, ls6 intake, lid, 3.73's, hpt, performabuilt level 1 tranny, 3600 stall, Stage 2.5 (5.3 heads), Torquer 2 cam, 42# reworked injectors, TR6 plugs.
2007 Avalanche LTZ - Catback and Eibach springs
Hot start with it stalling when I turned AC on. This is after I added 20% to the AC Torque vs IAT across the board.
Last edited by domestic rice; 05-27-2012 at 03:51 PM.
99Z A4 w/ SS LT's, h/f cats, magnaflow catback, port/polish t/b, egr deleted, ls6 intake, lid, 3.73's, hpt, performabuilt level 1 tranny, 3600 stall, Stage 2.5 (5.3 heads), Torquer 2 cam, 42# reworked injectors, TR6 plugs.
2007 Avalanche LTZ - Catback and Eibach springs
Your idle trims are way off. You need to work on the RAF and get your idle trims to 0 while in p/n and in gear. Do this with the a/c off. It's pretty easy especially if you have RTT. Also your fueling is crazy lean. In the mid 17's? You have some tuning to do.
2003 Chevy Silverado Daily Driver, 408 Iron Block,
LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.
Yeah I have been down that RAF route and everything was dead on. Now when i raise the airflow by hand higher than what the russ k config said to do, it actually makes ot better. As for being lean the wideband (at least mine) sucks and I don't believe it at idle. Thing is all over the place at idle. Have read a few places that none are really accurate at idle. Once I get going it looks good. I tuned the RAF, MAF and VE all very good near perfect before I moved on to the next. Now the only thing I can't get straight is the hot start AC on. reading about this AC Torque now and looks like this could be... Dunno...
99Z A4 w/ SS LT's, h/f cats, magnaflow catback, port/polish t/b, egr deleted, ls6 intake, lid, 3.73's, hpt, performabuilt level 1 tranny, 3600 stall, Stage 2.5 (5.3 heads), Torquer 2 cam, 42# reworked injectors, TR6 plugs.
2007 Avalanche LTZ - Catback and Eibach springs
Ac airflow is not your problem. You can clearly see that your raf is too low by your trims and by the idle desired airflow that your scanning.
2003 Chevy Silverado Daily Driver, 408 Iron Block,
LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.
All the russ k config does is log idle desired airflow. Just like what your logging in your config on the right side. You can see your idling around 1.300lb/min when your raf table is tuned at 1.00 or something like that. That's why your stit is so high
2003 Chevy Silverado Daily Driver, 408 Iron Block,
LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.
Reply With Quote