HELP! Evo 9 AEM V2 idle surging issue
Oct 29, 2015, 03:17 PM
#1
HELP! Evo 9 AEM V2 idle surging issue
I got my car tuned a few weeks back and I've had this really bad idle surging issue that my tuner is having trouble figure out. Also wont idle when the car is cold. Anyone else come across this issue? It didn't have the issue when the stock ECU and MAF were on the car. Did he maybe miss a setting that needed to be changed in the ECU? I already replaced both cam angle sensors and IAC sensor and still the same results
I posted my dyno graph and video I uploaded on YouTube at the very bottom
Car made 746hp and 576tq on e70 at 38psi
Short mod list:
Zeitronix wideband is wired to ECU and being used as the primary o2 sensor (deleted the stock pre cat o2 sensor)
Built 2.3L stroker 9:1
AEM V2 with stainless AEM 150 psi MAP sensor and IAT sensor
standard mounted PTE V2 6466 kit
AMS F1 intake manifold
Bomba 75mm throttle body
GSC S3 cams
Walbro 450 double pumper (15psi hobbs on second pump)
Primary pump rewired with STM kit
-8AN feed
-6AN return
Fuel FPR set at 35psi at idle
I posted my dyno graph and video I uploaded on YouTube at the very bottom
Car made 746hp and 576tq on e70 at 38psi
Short mod list:
Zeitronix wideband is wired to ECU and being used as the primary o2 sensor (deleted the stock pre cat o2 sensor)
Built 2.3L stroker 9:1
AEM V2 with stainless AEM 150 psi MAP sensor and IAT sensor
standard mounted PTE V2 6466 kit
AMS F1 intake manifold
Bomba 75mm throttle body
GSC S3 cams
Walbro 450 double pumper (15psi hobbs on second pump)
Primary pump rewired with STM kit
-8AN feed
-6AN return
Fuel FPR set at 35psi at idle
Last edited by EvokidIX; Oct 29, 2015 at 03:38 PM.
Oct 29, 2015, 10:47 PM
#4
You also need to put some thread sealant on the bolts that hold the throttle body on. They thread all the way into the intake manifold. You can get a boost/vac leak there.
To get your CAL you just need AEM Tuner installed on your computer. Plug your ECU into your laptop and after it is done connecting, do a file save and save the cal to your desktop. You can also just take some screen shots of the fuel map, and ignition map. If it will not cold start the startup enrichment tables need to be adjusted, and or you need to put new plugs in the car. If you are E85 make sure your are running a 7 or 8 heat range plug.
I am in corona/eastvale if you want to come down here I can take a look at your cal, and see if I can give it a little love.
To get your CAL you just need AEM Tuner installed on your computer. Plug your ECU into your laptop and after it is done connecting, do a file save and save the cal to your desktop. You can also just take some screen shots of the fuel map, and ignition map. If it will not cold start the startup enrichment tables need to be adjusted, and or you need to put new plugs in the car. If you are E85 make sure your are running a 7 or 8 heat range plug.
I am in corona/eastvale if you want to come down here I can take a look at your cal, and see if I can give it a little love.
Last edited by TheBoz; Oct 29, 2015 at 10:56 PM.
Oct 29, 2015, 11:08 PM
#5
My tuner was telling me that with the GSC S3s I have to degree my cams so it will run better? I didn't think that would cause this issue though?? Figured you'd only do that to gain more power up top or down low depending which way you defree them?
Oct 29, 2015, 11:41 PM
#6
On speed density the leaks do t matter as much. But anything past the throttle body will affect the idle.
You might need to adjust your idle feedback settings, or adjust your timing at idle. If your afr is all over the map that will kill your idle. You should also have your idle about 1100 on the s3's.
You might need to adjust your idle feedback settings, or adjust your timing at idle. If your afr is all over the map that will kill your idle. You should also have your idle about 1100 on the s3's.
Oct 29, 2015, 11:48 PM
#7
On speed density the leaks do t matter as much. But anything past the throttle body will affect the idle.
You might need to adjust your idle feedback settings, or adjust your timing at idle. If your afr is all over the map that will kill your idle. You should also have your idle about 1100 on the s3's.
You might need to adjust your idle feedback settings, or adjust your timing at idle. If your afr is all over the map that will kill your idle. You should also have your idle about 1100 on the s3's.
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Oct 30, 2015, 10:37 AM
#8
Also you should consider going back to a stock curt brown ported intake manifold. My car got a fatter mid range going from the AMS F1i to the Stock ported. There is a thread on here where someone picked up like 50tq by switching back to the stock ported, and lost nothing on the top.
The AMS part looks amazing, and does preform if you are in that 800+hp range. I made 702whp on 32psi with a CB ported IM and a bone stock throttle body.
https://www.evolutionm.net/forums/pr...rt-2-a-22.html
The AMS part looks amazing, and does preform if you are in that 800+hp range. I made 702whp on 32psi with a CB ported IM and a bone stock throttle body.
https://www.evolutionm.net/forums/pr...rt-2-a-22.html
Nov 5, 2015, 05:47 AM
#10
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Basically, if you're running properly working injectors with equal flow, and the injector latency table is set up correctly, and the motor is mechanically sound, there should not be a reason why the car won't idle right. It's really not that difficult.
