Anyone having or had issues with the spark breaking up above 7000 RPM?
I searched and tired there forum, but no help. Any AEM users or tuners feel free to jump in.

 

is it turboed?

 

NO. All motor

 

if it has high compression and the air fuel is good check the plugs try closing up the cap a bit

 

check spark plug gap.

 

this was a completely stock GSR motor that we tested the chassis and electronics with. But we need to figure it out before the race engine goes in for the new season starts.

 

spark plugs, cap, rotor, coil, maybe change the distributor.......will the factory ecu rev higher?? or you could try adjusting the the coil dwell time on the aem??

 

Are you using a cd ignition box (MSD)? There are issues with RFI and AEM EMS. AEM EMS does not have noise suppression, so that sometimes causes the ignition to break up. Happens often with MSD ignitions.. If you are usinf stock, I would check the cap, rotor, coil first..

 

We have seen this many times....Ill need the box # Serial # type of distributor and a copy of the Map to compare to a few maps here to find the exact problem...but it sounds like you have some problems in the setup of the cam/crank and injector phasing....these options were incorrect in early versions of the firmware and software...if you updated, these options will remain incorrect.

Howard

 

I have the same problem, I have #0040 and it's went back to aem & have replaced the proms it's 30- 1010 version 119

 

do an internal log and check for sync errors

 

do you have a factory distributor or reman (distributor king) dist. aem's have some problems with the aftermarket pick-ups on the ones from distributor king.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by speedworks &raquo;</TD></TR><TR><TD CLASS="quote">do you have a factory distributor or reman (distributor king) dist. aem's have some problems with the aftermarket pick-ups on the ones from distributor king. </TD></TR></TABLE>

true

 

What distributor do you have? Timing errors? Synch errors? What does the T2PER parameter show throughout the pull? New plugs?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by speedworks &raquo;</TD></TR><TR><TD CLASS="quote">do you have a factory distributor or reman (distributor king) dist. aem's have some problems with the aftermarket pick-ups on the ones from distributor king. </TD></TR></TABLE>

Very true. I dealt with this last night.

 

Thanks alot everyone. I'll try to get more info on it but I do know the box we have is for a 99 SI, and was the newest one out 6 months back. heres a pick of the set up so you guys know what we're dealing with

 

noice!

 

If you have msd ignition box get rid of it..Alot of cars have problems with breakup with msd's and they get rid of it and its gone..I had problems with msds on my old rx-7..Maybe something else though in your case..

 

Actually we have a digi.6. the first one went bad, never even started the car up.

 

Check the parameters everyone suggested and get back to us

 

When it comes to electrical stuff I always find that it is easier to do process of elimination so try to just get it to start without the msd and see if it works?I also had a ignition coil or driver go bad in my aem about a month ago so maybe thats the problem but i wouldnt know how to check for that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by siblues &raquo;</TD></TR><TR><TD CLASS="quote">I also had a ignition coil or driver go bad in my aem about a month ago so maybe thats the problem but i wouldnt know how to check for that?</TD></TR></TABLE>

i belive you could test for voltage at the specified output on the ecu. either that or check in your aem user manual that came with the ecu, and move the wire to a differant location(a known working one)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cptengineer &raquo;</TD></TR><TR><TD CLASS="quote">Actually we have a digi.6. the first one went bad, never even started the car up. </TD></TR></TABLE>

TRY IT W/O THE MSD.

 

I went through the same problems as you stated. I would hit a hard cut at 7000 and it seems like everything i did would not help the problem out. After 40 more pulls on the dyno, I said F it and went to a Hall Sensor from Tony at T1 and it fixed everything. Also i was funning a Digi 6 with a Blaster SS.

 

try swapping to a different distributor that is known to be running. had issues like that before misfiring at 5k on my aem 30-1000. swapped my friends dizzy and problem gone.