AEM AEM EMS start problems

[Vinzleclipse]

Hi all !

I have issues starting my car with a brand new AEM V2 (30-6310).

My car started fine with a stock ECU.

But when I installed my new AEM EMS in the car, it won’t start. I made some research, and after changing the spark ordering wire (4123 to 3214), the car finally hardly started.
It then ran fine, and after a little bit of tuning, it was even possible to do a first shot.

But the day after, when the car was cold, it was impossible to start it.
We tried all day long with my tuner, but nothing happened, except the starter that left us…

The car has MAP and IAT sensors, FIC 850cc, and we selected those specs in the AEM base map.

Could someone please help us ? And tell us why the car hardly started when hot and do not start at all when cold ?

Thank you !

 

[Vinzleclipse]

Can you try this cal file to see if it would make any difference. I changed the injector setup. Your injectors are low-z FIC 850cc correct?

Please ask your tuner to add at least the wideband, IAT, MAP, coolant temp and TPS sensors into log.
And let us know to what pin you connected the wideband, IAT and MAP sensors and how you deleted the resistor pack.
Are you 100% sure that your car doesn't have any issues while you were running with the stock ECU?

Thank you ! He will try and I’ll let you know !
I asked him if he could provide all those informations in the future log by the way.

That’s correct, these are low-z FIC 850.

And yes, car ran well with the stock ECU. However, tuner tested all the sensors, wires, sparks, coils, injectors, etc… and everything’s fine !

 

[Vinzleclipse]

Can you try this cal file to see if it would make any difference. I changed the injector setup. Your injectors are low-z FIC 850cc correct?

Sorry but your map didn’t make any difference…
Is it possible to provide me another one with your own sync setup ?
And with your own start and idle setup ? Into the Adv Pickup page please.

 

[DSMPT]

Is it possible to provide me another one with your own sync setup ?

with your own sync setup ?

As already mentioned that you don't usually need to change anything as long as if you use the stock ignition setup. So mine is as the stock. Please tell your tuner to stop messing with the ignition parameters for now. That is making the situation more complicated.

And with your own start

I already gave you above.

please provide how the wiring goes, and the pinout differences between the US and Euro ECU if you know.

Please ask the tuner to send at least some video, pics, or log etc.

Please ask your tuner to add at least the wideband, IAT, MAP, coolant temp and TPS sensors into log.

let us know to what pin you connected the wideband, IAT and MAP sensors

how you deleted the resistor pack.

Actually you have not provided/answered anything what I asked.

 

[Vinzleclipse]

As already mentioned that you don't usually need to change anything as long as if you use the stock ignition setup. So mine is as the stock. Please tell your tuner to stop messing with the ignition parameters for now. That is making the situation more complicated.


I already gave you above.






Actually you have not provided/answered anything what I asked.

Ok, here are the EDM vs USDM wiring to ECU (sorry only found it in german).
And here is how the tuner connected the wires to the AEM (everything in pink is connected).

Wideband is connected straight to ECU I presume (it worked well when the engine started).

IAT and MAP are connected using the previous MAF connector.

For everything else, I already asked the tuner to provide it to me, just waiting…

Knowing the car uses a 95-96 cam sensor, he tried to swap the spark plug wires, and changed the firing order from 1-3-4-2 to 3-4-2-1 yesterday. But the car wouldn’t start either…

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[DSMPT]

Wideband is connected straight to ECU I presume (it worked well when the engine started).

IAT and MAP are connected using the previous MAF connector.

For everything else, I already asked the tuner to provide it to me, just waiting…

That still doesn't answer my question... I don't know how come this is so difficult to know. Can you PLEASE ask your tuner to show us what sensor to what pin number he connected?

IAT and MAP are connected using the previous MAF connector.

What sensor to which pin? If this is true, then this could be the cause of no-start or one of causes. Because ECU may not be seeing the MAP sensor signal. You have the sensor assignment improperly according the cal file you sent me. This is WHY I have been asking you to add all sensors to log and show how you wired all sensors to where. That's to allow people to see if all sensors are working properly. Please forget what you or your tuner believe for now and eliminate all guesstimation/prejudice/assumption. Sometimes that may disturb to solve the issue.

 

[Vinzleclipse]

That still doesn't answer my question... I don't know how come this is so difficult to know. Can you PLEASE ask your tuner to show us what sensor to what pin number he connected?

It is written in the pictures I posted : IAT to pin 72, and MAP to pin 73.

For the logs, I asked him and am still waiting for him to send it to me, with all the sensors you asked for.

 

[DSMPT]

It is written in the pictures I posted : IAT to pin 72, and MAP to pin 73.

It seems you are not understanding. The pics you upload is as the default pins from factory, this doesn't guarantee your tuner wired like that. This is a standalone ECU, he can change to any pins as long as if the pin accepts the signal.

IAT and MAP are connected using the previous MAF connector.

You just said this ^^^. The MAP is connected to the MAF connector. This is NOT the pin 73. If you use the MAF connector for the MAP, this should probably be pin 85.
Please try the file I upload.