Hi guys. I have Idle problems. When I let off gas it drops all the way down and almost stalls, then bumps back up. Take a look at the graphs please. Started happening after RC 1000cc inj install, a tune and Buschur intake with stock pipe install, then AEM intake install. Same problem. Mods in my sig.Did some searching but no definite answer. Im on E85
Thanks

 

Your latencies look a little on the low side, compared to everything I have seen for rc1000's. Maybe try adding some latency? What do your trims look like?

 

Im just learning this. Is that what u r looking for? I have 2 tunes with map switch 91oct to e85
low oct map

high oct

 

Trims would be found in logging software, such as Mitsulogger, or EvoScan. They tell you whether the ECU is adding fuel or subtracting fuel for certain conditions, i.e. idle and cruise. Viewing and logging your trims is the best way to diagnose whether you have scaling and/or latency changes needed.

 

Is that it? But I dont think rpm dropped on this graph, do u need the one on idle with rpm drop? Thanks in advance

 

i'm sure a more advanced tuner can help you on your graphs, but since you're using the green, i'd say go back to the stock snorkel and just use the aem open element filter. verify you're not losing too much (or anything) during your pulls and call it a day.

if you must have the hard-pipe because it shows considerable gains, your ecu can be patched to counter the idle-rpm dip using bez's map to maf limiting/clamping code. keep us posted. thanks for the graphs and post what happens on the dip too. hopefully someone else can chime in with a straight tuning solution.

 

I am in california, so I needed a street legal intake system wich is that AEM intake with a carb sticker. I would stay with a stock air box but im on E85 right now so an open element filter is a big plus. But first I had a Buschur intake with stock plastic pipe and had the same issue.
So it is either a tune is needed to be tweeked(my tuner is arrainging another try prob next week)

Can something be wrong with the MAF adapter itself? Someone mentioned that it could be cleaned. What do I clean it with?

Also, can something be wrong with my stock 9 BOV? How to troubleshoot that?

Thanks again guys

 

You can't really tell from that graph what your fuel trims are. Your issue can be from a number of things, from injector scaling/latencies to your intake mods. In my opinion it is most likely due to the intake and/or filter, but getting your injectors dailed in perfectly may help lessen the issue.

To get your injectors dialed in perfectly, you need to get a log (after being warmed up) at idle with stft and ltft lo and one at a steady cruise of stft and ltft mid.

 

i'm going to have to suggest AGAINST cleaning the maf sensor with off the shelf MAF cleaner lol. i think i ruined mine doing that. make sure your MAF adapter plate is secured well with a gasket, but that should't cause the aformentioned problem by itself...do you have a another friend with an evo9 that you could swap maf's with for a moment?

you can visually check the BOV and physically push on the diaphram to make sure the spring is there/working (lol). other than that, since your problem is at idle, you shouldn't have to pressure test [the BOV] or anything.

like l2r99gst said, just make sure all of your scalings are 100%. if your tune is really good at WOT/cruise and your idle is impossible to dial after checking EVERYTHING mechanical (o2 sensor, o2 housing gasket, boost leak, TB seals, plugs, wires, coils, turbo seal, etc etc etc) and tune wise, then you can use the MAP to MAF code to stop the idle dip and have your car drivable again. i haven't ported it over to a 9 ecu rom yet, but i'll do it this weekend.

since many people with 9's haven't complained about this problem, you just may have a bad MAF or something simpler. you do have a bit of good airflow mods, so i wouldn't rule out just needing the patch either.

good luck.

 

Thanks a lot for your responce guys. Dang, I just bought a MAF cleaner off the shelf from Kragen. So I shouldnt clean with it, right? What do I use?
I someone with EVO9 so ill try to get him to swap MAF with me for a while.
Now the mechanical stuff:
Did the boost leak test - no leaks.
After Titek o2 housing install I used a brand new OEM metal gasket so it should be good.
Not sure how would I know if my o2 sensor is screwed up.
Just changed the plugs.
Didnt change coils.
Not sure what do u mean by Turbo seal. Everything connected to it pretty secure.
Can you guys see if all scalings are up to 100% by my graphs?
Ill log the car this weekend while cruising and at idle and post that too.
Does the injector scaling and latencies look right?
Thanks
P.S. can you please keep me in mind about that MAP to MAF code? Thx

Anything wrong with my o2 sensor here?