Setup:
Fully built F23 head and block
AEM EMS 1010
GM 3bar MAP
Stock throttle position sensor
RC 750cc injectors (12ohms)

The car was running hours before with smaller injectors and on the SAFC Hack. So the only thing that changed was the installation of new injectors, GM 3 bar MAP sensor and the removal of the SAFC.

I had an AEM certified tuner come to install a base map on the car to get me to the dyno. For some reason the EMS showed 50% throttle and high MAP signal from the start. After several attempts of different maps it started showing 100% throttle and high MAP signals.

Another odd problem is that it shows Injector 1, 2, 4 and 5. I have no idea why it’s not 1, 2, 3 and 4.

Here is a picture of the screen to show you what’s going on.

 

You load is a little off too...sure you cut off the MAP sensor plug and wired the 3 Bar to that and not the TPS sensor?

 

I'm sure. When it first was plugged in I could tap the throttle and it would show it going from 50-100%.

 

The car was also swapped from auto to manual. All the wires were swapped over and even ran on stock ECU.

 

was the throttle range set? also watch the tps voltage, should go betwen ~.5-4.5.

on a 1010, it goes inject 1,2,4,5. 3 is skipped

sounds like ur map is wired incorrectly jacking up ur 5v refernce, which only the tps and map use...

 

I thought it was supposed to be plug and play.

 

you have to run ecu setup and set the throttle range and ignition aswell.. it is plug and play but you still need to calibrate a few small things..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">I thought it was supposed to be plug and play. </TD></TR></TABLE>

plug and pay....someone that knows what they are doing

 

haha, you guys should rename it. And maybe be a little more specific in your "certified tuners". lol It worries me that that map i sent you impressed you guys. haha

 

we dont "certifiy" tuners....we factory train them, we dont cert them for anything! lol

 

I'll check the MAP wiring today. I'll get back to you soon.

 

I just finished doing some tests. Here is what I found. Please tell me if you think the AEM EMS that is broken or my logic with the test I performed is some how flawed.

I plugged in the factory computer. I tested the MAP and TPS voltage between the harness ground and the harness REF voltage (5V). That showed almost a perfect 5 volts between the two.

I then plugged in the AEM EMS and ran the same test. The ground for both harness no longer acted like grounds. So I now used the engine block as the ground and tested the voltage across all three wires (ground, ref and signal). They all showed 6-7 volts. So now the ground is somehow a voltage source.

Any thoughts?

 

you can also view the voltages the ems is seeing inside aempro as parameters. see what that says

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HYBRID_H@TCH &raquo;</TD></TR><TR><TD CLASS="quote">you have to run ecu setup and set the throttle range and ignition aswell.. it is plug and play but you still need to calibrate a few small things..</TD></TR></TABLE>

x2

I'm gonna step out on a limb here and guess that Tony doesn't care for the aem ems.

 

just like anything thing aem is just as good as the tuner behind it....

hey dude something isnt right upload you base map on here im.... something in your setting in the aem can not be right

 

also like other have asked have you set your throttle range?

 

We loaded the stock map from AEM and changed the MAP sensor to GM 3bar. Then changed the injectors to 750cc. We also set the voltage ranges.

No matter what the settings are why would the ground no longer act as a ground?

 

post your map..
also you have to set the throttle range in ecu setup or it will be off

 

The tuner has all the maps we tried. The range was adjusted, but that didn't change anything.

 

Okay, I decided to take another try at it on my own. I initially planned on doing the tuning myself, but I became gun shy and decided to pay a tuner. So I'm not completely in the dark with how the system works.

I started from scratch. I uploaded V1.19 firmware to the EMS. I then uploaded a file from my friends F23 EMS that I know for a fact ran his system. I made the MAP and injector size changes appropriately. I attempted to change the throttle range but that made no difference.

With all the fresh updates to the EMS and software I decided to ignore the entire wire harness and probe the outputs on the back of the EMS. There are two pins in the back that should output 5 volts to the MAP and TPS. Those two pins are at 7volts. The voltage problems I had earlier did not change with the updates.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KeyserSoze &raquo;</TD></TR><TR><TD CLASS="quote">

x2

I'm gonna step out on a limb here and guess that Tony doesn't care for the aem ems. </TD></TR></TABLE>

Actually, i wasn't fond of the EMS when it came out, but they have come a long way. The new software is very good, i've been very happy with it on everything i've done in the past year or so.

 

Bump for the night crew.

 

make sure you have MAP output set to voltage or your load will follow your TPS

its in the sensors-MAP-options settings

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wHOAlly &raquo;</TD></TR><TR><TD CLASS="quote">

plug and pay....someone that knows what they are doing </TD></TR></TABLE>

You guys both got it wrong! It's PLUG and PRAY!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stinker504 &raquo;</TD></TR><TR><TD CLASS="quote">Bump for the night crew.</TD></TR></TABLE>

stinker504,

AEM's Quality Control has been, well, really shitty lately. I wouldn't be surprised if your AEM is faulty. Here's a couple of things I would check before you get an RGA# for that aem box.

Connect to the ecu
Go to your full list of options by pressing Ctrl+O
In the find box type in MAP and search for "MAP Analog Input" make sure it's set to MAP Voltage. Next, search your full list again for "Throttle Analog Input" make sure it's set to TPS Voltage. Other than that, I would suggest CHECKING all the wiring. I think it varies from aem box to box, if the aem ecu doesn't see a correct MAP INPUT voltage, it defaults itself to TPS based fueling. Good luck.

 

Try and find someone in your area with a 30-1050 box. Switch it out and see what happens. Have you tried changing your MAP Min and MAP Max voltage? Is your MAP Analog Input set to MAP Voltage?