AEM EMS problem - Dodge SRT Forum
 2Likes
  • 2 Post By atroph
 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-29-2016, 10:17 PM Thread Starter
SRTforums Member
 
nel_srt4's Avatar
 
Join Date: Jun 2008
Location: Puerto Rico
Posts: 19
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Question AEM EMS problem

HELLO EVERYONE. IM NEW IN THIS FORUM. I GOT A USED AEM EMS FOR SOME TIME NOW. I NEVER INSTALLED, SO I NEVER KNEW IF THE ECU WAS GOOD OR NO. I NEEDED SOME MONEY SO I SELL IT TO SOMEONE. FEW DAYS LATER THAT SAME PERSON CAME BACK SAYING THAT THE ECU WAS DAMAGE BECAUSE THE 4 CYLINDER DIDN'T HAVE SPARK AND FUEL PULSE. HE SAID THAT HE LOOK TO EVERYTHING. MAP, PLUGS, SENSORS, INJECTOR, EVERYTHING. SO I RETURNED HIS MONEY. NOW IM WONDERING IF THE ECU ITS REALLY BAD OR NO. HOW CAN I FIND OUT???

SORRY IF I POST A LOT OF CRAP.
IM FROM PUERTO RICO AND IM BAD ON MY ENGLISH
nel_srt4 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 05-30-2016, 12:35 AM
SRTforums Member
 
atroph's Avatar
 
Join Date: Dec 2008
Location: Chesapeake, VA
Posts: 1,921
Mentioned: 4 Post(s)
Tagged: 1 Thread(s)
Quoted: 226 Post(s)
Garage
You need to be experienced with the EMS to be able to fully identify the box as faulty. This is achieved by the backyard mechanic with a lot of reading and hands-on experience with the EMS, or by an experienced AEM EMS tuner that can look at what is being displayed while cranking (via internal logs at a minimum). The EMS will tell you everything you want or need to know and you must possess the ability to extract and interpret the data to effectively troubleshoot a "no-start" condition.

Fuel and spark are dependant on cam/crank synchronization, and I have not seen an instance where both are dead UNLESS there is no "stat sync". If you do not know what "stat sync" is then it is time to hit the books, or find a competent AEM tuner; Period. If you attack the EMS blindly you will be very very disappointed.

Usually coil drivers go bad by someone using a MSD/Grantelli (sp)/et al coil pack (other than stock) which puts too much of a load on the drivers and eventually fries them.

The easiest way to tell if the injectors are firing is to hook up a noid light to the injector pigtail and attempt to start the car. At a minimum you should see 1 brief pulse which is the initial crank pulse.

Here is a quote from AEM which describes it much better (source: http://aemelectronics.com/?q=forum/c...al-crank-pulse --and-- http://aemelectronics.com/?q=forum/engine-start-detail ):

"The EMS will never fire coils or injectors unless Stat Sync is ON. That's rule #1 . Crank Inject All simply fires all the injectors at the same time when the Initial Crank Pulse fuel is delivered. Initial Crank Pulse is the first "squirt" of fuel that gets delivered during starting which is then followed by Crank Injector Time. When Crank Inject All is OFF, the Initial Crank Pulse is delivered sequentially. "

I must warn you that no 2 cars are alike and getting the EMS to "fire" with a stock canned tune will not always work. For instance my car had a crap tune on it when I purchased it. I rescaled the "stock" tune to match my fuel pressure and injectors and it would never sync cam and crank (stat sync). I took the crap tune settings that dealt with the timing sequence, merged it into the stock/rescaled tune, and it fired right up.

From a distant internet armchair quarterback perspective I willing to bet that the person that you sold the EMS to had no clue what they were doing.
HybridKid and SER-ious like this.

Last edited by atroph; 05-30-2016 at 12:43 AM.
atroph is offline  
post #3 of 3 (permalink) Old 05-31-2016, 05:35 AM
SRTforums Member
 
Bwap's Avatar
 
Join Date: Jun 2006
Location: Louisville
Posts: 451
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
The guy you sold it to clearly didn't have a clue.

Did he have it professionally installed by an AEM CERTIFIED dealer/tuner? How could be possibly say that it's bad otherwise? Shouldn't have given the fool his money back.

Atroph is dead on as well btw.


Last edited by Bwap; 05-31-2016 at 05:35 AM. Reason: for clarity
Bwap is offline  
Sponsored Links
Advertisement
 
Reply

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome