Mega Users seabass07 Posted November 5, 2010 Mega Users Share Posted November 5, 2010 This is a recent anomaly with my car. It happens every time doing WOT pulls in 3rd at around 5k rpm. It drops to 4800 and keeps going strong after that. It FEELS like a knock correction, so I logged for knock and looked at learning view. Nothing out of the ordinary except for the A/F correction in +40 range is at -2 (I don't think it problematic, just new). There is no learned knock and I am not getting knock at all. I confirmed this by resetting the ECU and doing a pull. No knock, but still a rev dip. I logged for misfires, and nothing at all. What are the other factors that could cause the ecu to pull timing other than knock and IAT? Any suggestions on possible causes? Or other things to log? My biggest worry is that my 5eat is slipping under peak boost and catching when boost dips a bit. The only thing that changed at the same time this started was my rear struts (obviously not related) and the air filter went from an AFE dry filter to an STP stock paper filter. Everything is completely stock. AFAIK this car has never been modded, so I'd be very shocked if the trans is slipping! BTW I know I am logging a bunch of useless crap, so the resolution is not very good. I was just playing with the logger. Here's the log.rev dip.csv Link to comment Share on other sites More sharing options...
dudeondacouch Posted November 5, 2010 Share Posted November 5, 2010 did you check it at wot in another gear? that way you could narrow it down. maybe it's not the rev range, it's the load range. Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted November 5, 2010 Author Mega Users Share Posted November 5, 2010 True. Maybe I'll try 4th...on a closed road. But it definitely does not happen in 1st or second. Link to comment Share on other sites More sharing options...
NSFW Posted November 6, 2010 Share Posted November 6, 2010 Is your transmission just shifting gears? Link to comment Share on other sites More sharing options...
SonicSpecB Posted November 6, 2010 Share Posted November 6, 2010 Somebody said torque converter lockup..that uasually happen on 5eats Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted November 7, 2010 Author Mega Users Share Posted November 7, 2010 Nope. It was in manual mode in 3rd. TC lockup should be at around 3500 rpm. I'm hoping it was just timing pulled for something heat related, but I'm still confused. I'll be doing a bit of logging tonight and I'll see if it does it in 4th in the same load range. I'm going to log coolant temp and see if there is any correlation. I know it will pull timing if the temp gets too high. Other than that, I'm at a loss...the temps are in the 60s now so I'll see if it even does it. If it's the transmission it should be a little bit worse with lower temps. Link to comment Share on other sites More sharing options...
SonicSpecB Posted November 7, 2010 Share Posted November 7, 2010 This always happens to me around 5300rpm logs show nothing at all except drop in airflow,rpm and load. Link to comment Share on other sites More sharing options...
07spec_b Posted November 7, 2010 Share Posted November 7, 2010 thats slippage, probably not the tires so its unfortunetly the transmission Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted November 7, 2010 Author Mega Users Share Posted November 7, 2010 does anyone have a 3rd gear pull on the 5eat with revs and mph? that should tell me if its slipping. its not doing it now.its just a flat spot now. Link to comment Share on other sites More sharing options...
Yamarocket630 Posted November 7, 2010 Share Posted November 7, 2010 What does the throttle do? Is it closing slightly at this point? Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted November 7, 2010 Author Mega Users Share Posted November 7, 2010 No I've logged the same thing with the throttle at a constant 99.8% Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted November 9, 2010 Author Mega Users Share Posted November 9, 2010 Thanks for the help guys. The weather cooled down and it went away. If it was transmission slippage, it would be worse with cold weather. I think it may have been heat related. I'll see what happens when it gets hot again. I also just went to a stage 1 map. It's up 2 psi at 5100 and it is solid with no flat spot and no slippage. Link to comment Share on other sites More sharing options...
utc_pyro Posted November 9, 2010 Share Posted November 9, 2010 I get strange stuff in that range too. The lockup map is funny in that area, the car tries to lock up the torque converter, but normally fails to fully do so. In my logs I can see a slight "blip" down, at times, and then it goes back to normal. Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted November 10, 2010 Author Mega Users Share Posted November 10, 2010 One interesting side note... I upped the requested torque tables on my stock map and the flat spot wasn't there in the logs. It must have effected the lockup. Link to comment Share on other sites More sharing options...
mineENGR Posted February 3, 2011 Share Posted February 3, 2011 I know this a dead thread but I'm really glad to read this as I had my own worries today about the tranny slipping also. Same situation as yours with it only happening in 3rd around 5k rpm. Also I tried it a second time in D, but backed off from WOT earlier than I usually do and got 2 rough shifts up to 5th. Hope it's nothing serious. Thanks for the info anyways! Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted February 3, 2011 Author Mega Users Share Posted February 3, 2011 I'm still confused about this! It has never happened since then and it's colder now. If it was slippage, I think it would be worse now. It was a temporary anomaly whatever it was. Link to comment Share on other sites More sharing options...
Saltygt Posted February 3, 2011 Share Posted February 3, 2011 My car has done the same thing since the day I bought it. It does not always happen but more often than not I feel it. In 55k miles it hasnt gotten worse or better so I think it is more of an annoyance than a problem. I would love if someone could diagnose it and figure out a solution because after the blip the car almost gets a second wind. If it could just feel that way all the way through without the blip I would be happy. Link to comment Share on other sites More sharing options...
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