AEM guys...come here please

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IJ.

Grumpy Old Man
Mar 30, 2005
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My brand new CPS wouldn't fire the MoTeC consistantly so I ended up pulling the unused Coil/magnet and regapping the other 2 using a piece of writing paper folded in half at the suggestion of a MoTeC engineer.

Once I reset the trigger voltage levels it fired right away, not saying this is your issue Chris but it's worth looking at.
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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Interesting...

What affect does pulling out the other coil and magnet have on it? I'm not questioning the suggestion... I just don't know what it does.

I may have to try it, but I'm unsure if there is one that isn't used by the AEM
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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I'll be checking on a bunch of these suggestions tomorrow to see if anything different comes of it. Thanks for all the help thus far guys, and keep it coming...

I'm going to make over 600 one day...lol
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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Doesn't the AEM use all three, since it has cam teeth listed as 4?

I don't know... This seriously has me considering parting the car...

I'm leaning very hard toward the box being bad. I have tried 5 CPS's now, 4 coil packs, and 7 ignitors... none of this changed anything. It's dead consistant on where it is...

The harness is brand new(less than 1 year old, less than 3k miles)

I wonder if AEM will sell me a new board. I don't understand how other people's maps and harware will work with their AEM on their car and the same hardware and map not work on mine...
 
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figgie

Supramania Contributor
Mar 30, 2005
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Twin Cities, Minnesot-ah
gixxer750 said:
Doesn't the AEM use all three, since it has cam teeth listed as 4?

I don't know... This seriously has me considering parting the car...

I'm leaning very hard toward the box being bad. I have tried 5 CPS's now, 4 coil packs, and 7 ignitors... none of this changed anything. It's dead consistant on where it is...

The harness is brand new(less than 1 year old, less than 3k miles)

I wonder if AEM will sell me a new board. I don't understand how other people's maps and harware will work with their AEM on their car and the same hardware and map not work on mine...
Click to expand...

A couple more ideas.

you said the car does not rev past 5300 rpm.

Is this at WOT or not?

If it is at wot. Have you tried a light load pull past 5300 rpm? If it still does it at even light load. Then that rules out ignition system as at light load it does not take that much to initiate the spark. have a current map you can email me?

figuwx@hotmail.com
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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I've done it at light load... it will rev past it under like 10 percent throttle... going in very slowly... above 10% though... :(

I'm extremely frustrated... I think I'm going to take a break from the car for a few days.

Figgie:

The map the car is currently using is posted on AEMforums. It is titled marshall's cal file. Its under ems tuning, and the thread under my name.
 
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figgie

Supramania Contributor
Mar 30, 2005
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gixxer750 said:
I've done it at light load... it will rev past it under like 10 percent throttle... going in very slowly... above 10% though... :(

I'm extremely frustrated... I think I'm going to take a break from the car for a few days.

Figgie:

The map the car is currently using is posted on AEMforums. It is titled marshall's cal file. Its under ems tuning, and the thread under my name.
Click to expand...

Have you measured and adjusted your TPS per TSRM and made sure the AEM is reading the correct TPS also?

btw MAP based or AFM?
 
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John Reed

Supramania Contributor
Mar 23, 2007
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Portland, OR
I will be honest, I just saw this thread and only skimmed the last page so pardon if I have missed something from the first pages. Sounds like it won't rev past 5300, is it misfiring? View the paramenter "Timing Errors" and see if this changes when the misfire happens. Feel free to email me your map! And if there is a cliff notes version of the problem, post that up also. :biglaugh:
 
turbogate

turbogate

Life is Boost
May 18, 2005
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South, FL
gixxer750 said:
Map based, I have measured and adjusted my TPS according to the nissan service manual(Q45).
Click to expand...

Have you told the AEM what CPS voltage/range to expect? (correct me if I'm wrong guys), but doesn't the AEM need to be set to know which voltage(range) is 0% throttle up to 100% from the CPS right? If it's set-up to expect the Toyota cps voltage range, it may not work properly when it see a different range. Again, I'm no expert at AEMs, but for example, the S-AFC and stock computer needs to see a certain voltage range for example when running an Q45 TB. Again, if I'm way off, I apologize and will edit my post.

Also, you just got very lucky, lol it doesn't get better than John Reed when it comes to tuning, from his resume :), you better send him your map asap, lol

Good luck
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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The TPS range is set when you do the startup on the aem. It checks the voltage at throttle closed and throttle wide open and assumes it is linear.
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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From what I have looked at, it appears to be completly linear.

Henry @ AEM has verified from my logs that I am NOT losing cam or crank signal at the problem area.
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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well Dr. I don't have the stumble @ all that most of the mk3 owners complain of...

I haven't had it yet, even with multiple hardware changes. I think it's the box itself that causes it on the mk3 supra
 
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gixxer750

2jzget comingsoon!
Mar 30, 2005
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Do you think it is the same problem?


I know with the stumble, from HALMK3supra's car, you get a tach jump at the stumble area @ 3k... I don't get the tach bounce at the problem point... its like the engine just WON'T rev any higher, but I know thats not the case.
 
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figgie

Supramania Contributor
Mar 30, 2005
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gix

I am going to side with Adam.

we have looked at the problem and you are still having an the no rev past 5300 rpm issue. This leads to a couple of possibilities but the more likely being the ignitor especially if the ignitor is not feeding the coils enough juice.

On that note have you tried to close the gap down to .28 or even .20 for the sake of experimenting?
 
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