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94 Turbo Mustang missfires or cutoff at 4800 after install AEM

  • Thread starter Thread starter 94TurbostangKSA
  • Start date Start date Jul 19, 2008

94TurbostangKSA

New Member
Jul 19, 2008
3
0
0
Jul 19, 2008
#1
  • Jul 19, 2008
  • #1
After installing AEM with basic tunning car runs fine with 5 bar aem map sensor(mafless) when i took the car to the dyno rpm does not exceedes 4800 it seems it hits a rev limiter or cutoff.

I tried to lower the dwell factor from 35 to 30 then to 27 the car revs better but still there is a cut around 4800 to 5200, i also tried to play with dwell vs rpm table and dwell vs volt at the point which has the problem but no sucess.

The car has the stock distributer + msd 2F coil and msd 6a ignition box i tried to disconnect the msd and also tried another coil from crane and made the adjustments but the problem is still there.

The car has 347 stroker, Spyder intake + 90mm TB, edelbrock victor jr heads, custom bennett cam+1.7 RRA, T76 precission unit, pro turbo kits, AEM, TKO 600, 65lb injectors, dual fuel pump + fuel lines.

The boost level now at 13psi, the car did not has this problem before the AEM it just appears after i installed it.

I tried to look the timing by removing the spout, first run with little cut and second run it revs OK, but the third run the problem came back (when i removed the spout all the dwell settings remain unchanged from the best run before removing the spout).

Any ideas or help!!!!!!!!!!!!!:crying:
 

toyman

10 Year Member
Jul 19, 2007
1,944
54
79
Vernon BC
Jul 19, 2008
#2
  • Jul 19, 2008
  • #2
94TurbostangKSA said:
After installing AEM with basic tunning car runs fine with 5 bar aem map sensor(mafless) when i took the car to the dyno rpm does not exceedes 4800 it seems it hits a rev limiter or cutoff.

I tried to lower the dwell factor from 35 to 30 then to 27 the car revs better but still there is a cut around 4800 to 5200, i also tried to play with dwell vs rpm table and dwell vs volt at the point which has the problem but no sucess.

The car has the stock distributer + msd 2F coil and msd 6a ignition box i tried to disconnect the msd and also tried another coil from crane and made the adjustments but the problem is still there.

The car has 347 stroker, Spyder intake + 90mm TB, edelbrock victor jr heads, custom bennett cam+1.7 RRA, T76 precission unit, pro turbo kits, AEM, TKO 600, 65lb injectors, dual fuel pump + fuel lines.

The boost level now at 13psi, the car did not has this problem before the AEM it just appears after i installed it.

I tried to look the timing by removing the spout, first run with little cut and second run it revs OK, but the third run the problem came back (when i removed the spout all the dwell settings remain unchanged from the best run before removing the spout).

Any ideas or help!!!!!!!!!!!!!:crying:
Click to expand...

Also experiencing the same problem. Mine seems to hit a rev limiter at 5300 and I and the tuner can't find anything that's triggering the event. A call to AEM tech didn't shed any light on the problem. Rev limiter fuel cut and ignition cut is set at 7500. Fuel cut load set at 205.99 kPa. I have an AODE if that is important.
 

94TurbostangKSA

New Member
Jul 19, 2008
3
0
0
Jul 20, 2008
#3
  • Jul 20, 2008
  • #3
Today i removed the spout and set the dwell factor to 35, timing set at 22 degree the problem SOLVED. but in this case the timing is locked to what i set manually.

If i put the spout back the problem came again. and i am planning to use AEM ignition map for max accuracy instead of decreasing the timing at the max torque point.
 

Stanger007

Founding Member
Sep 26, 2001
2,015
2
46
Baton Rouge, LA
Jul 20, 2008
#4
  • Jul 20, 2008
  • #4
Thought about spark blowout?

Wes
 

toyman

10 Year Member
Jul 19, 2007
1,944
54
79
Vernon BC
Jul 20, 2008
#5
  • Jul 20, 2008
  • #5
Stanger007 said:
Thought about spark blowout?

Wes
Click to expand...

On all 8 cylinders? I'll check on the gap but the plugs are new and installed just 2 weeks ago.

It behaves just as you would expect a rev limiter to. The engine just dies as if the spark was killed. No missing and sputtering. On the dyno sheets my HP is still climbing when it shuts down.
 

94TurbostangKSA

New Member
Jul 19, 2008
3
0
0
Jul 21, 2008
#6
  • Jul 21, 2008
  • #6
The car was blowing sparks before the msd ignition box, after i installed it the car revs like hell, the only changes done to the car was the AEM, then this problem came out.
 
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