Clean up tune??
#1
Clean up tune??
I don't frequent as much here since I purchased a G8 GT earlier this year but I have what I think is a tuning related question. 06 LSJ, 60's, 2.9 pulley, dual pass, zzp HE, full ZZP 2.5" exhaust, etc. Anyway, I had my car dyno tuned about 30k miles ago (spring of last year I believe) and it ran/runs great for the most part with the exception of an idle hunting issue. When I first got it tuned, since it was spring, the outside temps weren't that high. When it got to summer I did notice that every once in a while the car would hunt/surge around for the correct idle speed when coming to a stop. Nothing crazy and usually a couple ups and downs and it would correct itself. If it wouldn't, a quick blip of the throttle would fix it. Now this summer I've noticed that it seems to be doing it more frequently. It does it more when it's really hot and humid out. I can watch my wideband when it does it and it follows the hunting idle by going really lean to really rich. I don't have anyway to data log but I'm just curious if anyone has experience with a similar issue. It hasn't gotten to the point that I feel I must fix it but it is annoying when I pull up to a light and it's doing it. Sorry for the long post and thanks for any assistance. Oh, I do know there have been issues with 60's and idle.
#8
Senior Member
iTrader: (1)
I don't know, I just know with my Trifecta experience that my car doesn't like to idle sometimes because of the tune. I know it's the tune because I can smooth it out by manipulating the throttle. It starts to swing and doesn't like to stop. Temperature extremes can change the intensity of the effect. I don't know what it would take to correct this issue but Trifecta can't seem to figure it out for me. It's very annoying. Stop lights are embarrassing for me.
#18
I didn't notice the idle issue until months after the initial tune since it didn't present itself until the heat of summer. That was last year and it annoyed me a little but now it seems to be getting worse/more frequent. I didn't have the greatest experience with the shop so I don't know that I'd want to go back there. They supposedly road tuned it as well. There is someone local that road tunes. I think ecoboost's and mazdaspeed's mainly but dabbles in others. I may look into him at some point. I just wanted to get some feedback as to whether yes it could be the tune or maybe other mechanical places to check. I do have a scangauge, should I set that to monitor STFT? I don't know what numbers I'm looking for exactly.
I also don't think I've ever really posted a picture of my car. Got it bone stock at 133k. At 176k now.
I also don't think I've ever really posted a picture of my car. Got it bone stock at 133k. At 176k now.
#19
Senior Member
iTrader: (6)
Honestly checking mechanical health is always a good idea, I'd start with checking for any vacuum leaks and get a leak down test performed. How old are you spark plugs and your oxygen sensors?
#20
Spark plugs were changed at 170k (NGK one step colder). O2 sensors are Front at 133k and rear at 157k with OEM ones. Air filter cleaned with MAF at 174k. Fuel Filter at 157k (could probably stand to change that again). Fuel pump changed at 135k. MAP sensor at 148k. Crank position sensor at 145k.
I maintain the car pretty religously since it was my baby before getting the G8. I've rebuilt the whole suspension, swapped out the few vaccuum lines it does have, changed the timing chain, balance chain, tensioner, added head studs, changed the supercharger coupler and added new oil, etc. I know most of that has nothing to do with the problem but just an idea of how I've maintained it. Oil gets changed regularly around 4k miles also.
I maintain the car pretty religously since it was my baby before getting the G8. I've rebuilt the whole suspension, swapped out the few vaccuum lines it does have, changed the timing chain, balance chain, tensioner, added head studs, changed the supercharger coupler and added new oil, etc. I know most of that has nothing to do with the problem but just an idea of how I've maintained it. Oil gets changed regularly around 4k miles also.
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jmix (10-04-2018)