Black_Rain Posted May 27, 2011 Share Posted May 27, 2011 Hello - Car 100000% stock...no mods or anything. Lots of highway and some city. Pulled a learning view and saw no knock, took a sigh of relief. noticed the A/F Learning was a big high though, so I tried to read up about it. Would love your input. First LV was today. Second LV was after 1.5 hour drive, some stop/go traffic and a 3rd gear pull, but mostly highway. I'm concerned about the 14.7% and 15% http://img.photobucket.com/albums/v665/scr5008/LearningView_SS_5-27-201115544PM.jpg http://img.photobucket.com/albums/v665/scr5008/LearningView_SS_5-27-201140057PM.jpg Link to comment Share on other sites More sharing options...
NSFW Posted May 28, 2011 Share Posted May 28, 2011 I'm concerned about the 14.7% and 15% That typically indicates a vacuum leak. More info here: http://www.romraider.com/forum/viewtopic.php?f=33&t=7202 Link to comment Share on other sites More sharing options...
Black_Rain Posted May 29, 2011 Author Share Posted May 29, 2011 Wow, awesome write up on the vacuum leaks... I'll check it out tomorrow. My car is noticeably rougher at idle, so I wouldn't be surprised. Link to comment Share on other sites More sharing options...
Black_Rain Posted May 30, 2011 Author Share Posted May 30, 2011 So I did a lot of poking around for a vac leak today, nothing showed up under visual inspection. Going to do a little more research and another look. I also replaced the filter and will clean the MAF, any chance that'll help the higher numbers? Link to comment Share on other sites More sharing options...
rtbrjason Posted May 30, 2011 Share Posted May 30, 2011 Cleaning the filter would probably want to make the numbers higher if they could go higher. I've seen just not having the filter properly installed and box properly sealed cause that A trim to go full positive while not having as big an effect on the other trims. Make sure the filter is seated in there correctly and that the airbox is locked together correctly. Link to comment Share on other sites More sharing options...
Black_Rain Posted June 2, 2011 Author Share Posted June 2, 2011 Ok, so I did a lot of checking for vacuum leaks and couldn't find anything. I'll do a soap test on the up pipe soon, and possibly remove the intercooler to check the TB hose and t-tubing (unless someone can tell me how to get to the t-tube w/o removing it?), but I'm trying to link certain things together as well. I decided to log my roughness in all cylinders @ idle last night, I occasionally throw P0302/3/4 CELs, and just attributed it to bad gas/older plugs (replaced now)/injectors. I was seeing NO roughness on Cyl 1/3/4, but on Cyl 2 there were misfires every few seconds. It decreased around 1500 rpm, and I'm really not concerned. From what I learned doing my research, I could invest in new stock injectors or something like that, not sure if it's worth it. Thoughts? I also wanted to ask if that roughness/misfire count in cyl 2 at idle could be throwing the above A trim in my LV's off? Since I could find no vac. leaks, has anyone else seen this effect? My boost is peaking at 12.62 in two separate 3rd gear WOT logs, so I suppose a leak could be there, but also I'm running at 100 degree intake air temp... it's been hot these days! I feel like my engine just wont boost that high with such humidity/heat. I'm still very new to logging/interpereting all this data, so any thoughts on the above helps tremendously! Car - Stock map... just an sti up pipie installed w/ new gaskets by a real mechanic Also my FBKC was all 0 for my WOT logs, and no knock count... was real happy about that. **edit - I also pulled a LV last night after another 200 miles on my car since the first LV's posted above, A trim was down to 13.9. Going to keep monitoring it. I did replace the filter, didn't clean the MAF yet. Can't imagine the filter is dropping the A trim though (as stated above) Link to comment Share on other sites More sharing options...
TheBoostNazi Posted June 2, 2011 Share Posted June 2, 2011 Ok, so I did a lot of checking for vacuum leaks and couldn't find anything. I'll do a soap test on the up pipe soon, and possibly remove the intercooler to check the TB hose and t-tubing (unless someone can tell me how to get to the t-tube w/o removing it?), but I'm trying to link certain things together as well. I decided to log my roughness in all cylinders @ idle last night, I occasionally throw P0302/3/4 CELs, and just attributed it to bad gas/older plugs (replaced now)/injectors. I was seeing NO roughness on Cyl 1/3/4, but on Cyl 2 there were misfires every few seconds. It decreased around 1500 rpm, and I'm really not concerned. From what I learned doing my research, I could invest in new stock injectors or something like that, not sure if it's worth it. Thoughts? I also wanted to ask if that roughness/misfire count in cyl 2 at idle could be throwing the above A trim in my LV's off? Since I could find no vac. leaks, has anyone else seen this effect? My boost is peaking at 12.62 in two separate 3rd gear WOT logs, so I suppose a leak could be there, but also I'm running at 100 degree intake air temp... it's been hot these days! I feel like my engine just wont boost that high with such humidity/heat. I'm still very new to logging/interpereting all this data, so any thoughts on the above helps tremendously! Car - Stock map... just an sti up pipie installed w/ new gaskets by a real mechanic Also my FBKC was all 0 for my WOT logs, and no knock count... was real happy about that. **edit - I also pulled a LV last night after another 200 miles on my car since the first LV's posted above, A trim was down to 13.9. Going to keep monitoring it. I did replace the filter, didn't clean the MAF yet. Can't imagine the filter is dropping the A trim though (as stated above) still sounds like you have a vac leak. when you have a leak it can cause a misfire in 1 or more cylinders randomly. My 08 had bad intake manifold gaskets and would misfire on all cylinders with a lean code until the engine was up to temp (gaskets soften and seal). either you're intake manifold gaskets are leaking or you're not looking hard enough at ALL the vac tubes. there's hundreds of them. you want all the trims NO greater than +/- 5%. so until it's in that range, your leak is still there BRO. you need to remove the IC to get at the throttle body tube, it takes 5 seconds to pull off, 3 12mm bolts and 2 clamps. my STRONG suggestion is to remove the IC and look at all the vac tubes that lie under it into the manifold, there should be like 3 or 4...and they randomly pop off. and you're still not hitting factory boost so it should be a significant leak/tube popped off. BRO. Link to comment Share on other sites More sharing options...
Black_Rain Posted June 2, 2011 Author Share Posted June 2, 2011 Thanks, Brah. I'm not disagreeing w/ you at all, just thought now that I have a few more logs and observations, i'd throw them into the pot. I'll rip off the IC sometime next weekend, it was part of my plan, just out of town this weekend... I know it wont take long, but I can't risk an hour of unplanned struggle to get the TB hose to line back up. Link to comment Share on other sites More sharing options...
TheBoostNazi Posted June 2, 2011 Share Posted June 2, 2011 if your referring to that n00b that took three days to reinstall his IC, don't expect that. it all goes back on the same time as it comes off. Link to comment Share on other sites More sharing options...
YourConfused Posted June 2, 2011 Share Posted June 2, 2011 My 08 had bad intake manifold gaskets and would misfire on all cylinders with a lean code until the engine was up to temp (gaskets soften and seal). BRO. Isn't more likely the increased seal was due to the thermal expansion of the aluminum, therefore reducing the gap and tightening the tolerances? Most, if not all, of the gaskets are made of materials that do not soften to seal, but rather allow for a bit of flex (movement) due to above mentioned thermal expansion. What are the intake gaskets, basically something like EPDM or silicon, and the others are MLS? I don't know. I have not dealt with the ones on this car yet, but this what I gather. So to add to the list of "look for this" you may also check for loose bolts. Just a suggestion from an inexperienced LGT noob. lol. good luck with it! Link to comment Share on other sites More sharing options...
TheBoostNazi Posted June 2, 2011 Share Posted June 2, 2011 My 08 had bad intake manifold gaskets and would misfire on all cylinders with a lean code until the engine was up to temp (gaskets soften and seal). BRO. Isn't more likely the increased seal was due to the thermal expansion of the aluminum, therefore reducing the gap and tightening the tolerances? Most, if not all, of the gaskets are made of materials that do not soften to seal, but rather allow for a bit of flex (movement) due to above mentioned thermal expansion. What are the intake gaskets, basically something like EPDM or silicon, and the others are MLS? I don't know. I have not dealt with the ones on this car yet, but this what I gather. So to add to the list of "look for this" you may also check for loose bolts. Just a suggestion from an inexperienced LGT noob. lol. good luck with it! I'm not really 100% sure as i didn't measure the tolerance when the engine was cold or hot, all I know is the idle smoothed out when it was warmed and didn't misfire. Link to comment Share on other sites More sharing options...
Black_Rain Posted June 2, 2011 Author Share Posted June 2, 2011 if your referring to that n00b that took three days to reinstall his IC, don't expect that. it all goes back on the same time as it comes off. haha I guess I am, maybe i'll give it a try tomorrow if i'm not too hungover Link to comment Share on other sites More sharing options...
TheBoostNazi Posted June 2, 2011 Share Posted June 2, 2011 haha I guess I am, maybe i'll give it a try tomorrow if i'm not too hungover just don't vomit in the turbo outlet, the chunks may get hung up in the IC channels.. Link to comment Share on other sites More sharing options...
Black_Rain Posted June 2, 2011 Author Share Posted June 2, 2011 just don't vomit in the turbo outlet, the chunks may get hung up in the IC channels.. Why do you think I keep my dead trunk monkey around? Perfect size to plug the turbo during maintenance. Link to comment Share on other sites More sharing options...
ProjectS15 Posted January 23, 2012 Share Posted January 23, 2012 any update? Link to comment Share on other sites More sharing options...
timbo7 Posted June 9, 2012 Share Posted June 9, 2012 Did you everything find the leak? My trim a is high and I'm having trouble finding a problem. Just wondering what was wrong with yours. Link to comment Share on other sites More sharing options...
ericem Posted June 9, 2012 Share Posted June 9, 2012 im going to recommend replacing the turbo inlet especially after anyone touches the turbo. Link to comment Share on other sites More sharing options...
timbo7 Posted June 9, 2012 Share Posted June 9, 2012 im going to recommend replacing the turbo inlet especially after anyone touches the turbo. I actually just got done doing that last weekend as the old one was torn to hell. I want to go stage 2 shortly but can't seem to get the idle trim down. The other 3 trims are fine. Link to comment Share on other sites More sharing options...
ericem Posted June 9, 2012 Share Posted June 9, 2012 maybe its the o2 sensor. Link to comment Share on other sites More sharing options...
timbo7 Posted June 10, 2012 Share Posted June 10, 2012 maybe its the o2 sensor. Wouldnt that throw a code? Link to comment Share on other sites More sharing options...
ericem Posted June 10, 2012 Share Posted June 10, 2012 not necessarily. Link to comment Share on other sites More sharing options...
timbo7 Posted June 10, 2012 Share Posted June 10, 2012 No other way to tell other than replacing it? Its over $100 so I dont want to just replace it if I dont have to. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.