Emanage Blue causing premature combustion
04-15-2007 | 01:23 PM
#1
Emanage Blue causing premature combustion
Well im not sure if the Title is fine but there is my problem:
I installed emanage blue, everything works. a/f, ignition harness, tps, etc...
I drove around, then came back turned car off. after a few minutes of car being off, i turn key to the ON positions (without attempting to crank), i hear BOOOM. didnt know what it was. i start car everything runs fine. then turn car off, leave, come back home i try to put key to on, and BOOOM even louder.
Basically whats happening is that the Coils are turning on when i put key to ON position (since the emanage turns on). Is the emanage supposed to be turning the coils on even though the car is off? also I think the reason there is an explosion inside a cylinder is because I might have leaky injectors (only thing i can think off that makes sense). anyone have this issue?
BTW, i installed diodes to prevent burnt coils.
I installed emanage blue, everything works. a/f, ignition harness, tps, etc...
I drove around, then came back turned car off. after a few minutes of car being off, i turn key to the ON positions (without attempting to crank), i hear BOOOM. didnt know what it was. i start car everything runs fine. then turn car off, leave, come back home i try to put key to on, and BOOOM even louder.
Basically whats happening is that the Coils are turning on when i put key to ON position (since the emanage turns on). Is the emanage supposed to be turning the coils on even though the car is off? also I think the reason there is an explosion inside a cylinder is because I might have leaky injectors (only thing i can think off that makes sense). anyone have this issue?
BTW, i installed diodes to prevent burnt coils.
04-15-2007 | 09:07 PM
#3
could that be the reason why that the emanage's prematurely fry the ig coils if its left in the on position for extended periods of time? but i mean regardless even if the emanage is firing the coils when in the on position, you shouldnt have any fuel in the cylinders lesspossibly one hte injectors is shorting out or there is a bad seal.
04-16-2007 | 08:17 AM
#5
Originally Posted by panda_1
could that be the reason why that the emanage's prematurely fry the ig coils if its left in the on position for extended periods of time? but i mean regardless even if the emanage is firing the coils when in the on position, you shouldnt have any fuel in the cylinders lesspossibly one hte injectors is shorting out or there is a bad seal.
Yes it is one of the reasons.
04-16-2007 | 08:33 AM
#6
According to an electrical engineer over at J&S, this is his theory on precisely why this happens...
http://forums.maxima.org/showpost.ph...7&postcount=14
Originally Posted by John at J&S
Key on, engine not running, the coils should be off, and the emanage outputs should be at 0v.
I think there is a grounding issue between the emanage and the igniter transistor, inside the coils. Some of the J&S units had the problem as well, until I changed the output driver structure.
The emanage outputs are open collector transistors with 1k ohm pullups. My theory is that the emanage ground is at a slightly higher potential than the coil ground, allowing a trickle current to flow out of the pullup resistor, into the igniter transistor. Note that the trickle current is amplified by the gain of the transistor.
Use diodes with the highest forward voltage drop. In other words, the best diodes would be the worst ones.
I changed from open collector NPN's to P channel MOSFETs. This way, there is no pullup resistor to leak.
Rewiring the power is not a guaranteed fix, either, since some coils are lost with the engine running.
The igniter transistors are pulsed on and off. They pass high currents when on, heating them, then cool down when off. What happens if they are never fully off?
Most ignitions you see have heat sinks to keep the transistors cool, but the coils have no heat sink, unless the engineers hope that enough heat will go out the mounting bolt.
I think there is a grounding issue between the emanage and the igniter transistor, inside the coils. Some of the J&S units had the problem as well, until I changed the output driver structure.
The emanage outputs are open collector transistors with 1k ohm pullups. My theory is that the emanage ground is at a slightly higher potential than the coil ground, allowing a trickle current to flow out of the pullup resistor, into the igniter transistor. Note that the trickle current is amplified by the gain of the transistor.
Use diodes with the highest forward voltage drop. In other words, the best diodes would be the worst ones.
I changed from open collector NPN's to P channel MOSFETs. This way, there is no pullup resistor to leak.
Rewiring the power is not a guaranteed fix, either, since some coils are lost with the engine running.
The igniter transistors are pulsed on and off. They pass high currents when on, heating them, then cool down when off. What happens if they are never fully off?
Most ignitions you see have heat sinks to keep the transistors cool, but the coils have no heat sink, unless the engineers hope that enough heat will go out the mounting bolt.
04-25-2007 | 05:38 AM
#7
Senior Member
Joined: Nov 2002
Posts: 576
From: indiana
Same problem
My emanage does the same thing. I directly soldered everything and no resistors/diodes. I also have the same starting problem. Ie my car never starts!!! Its like it floods out! I have deatchwerks injectors 550. If I push start and pop the clutch it fires right up! and runs fine.
(still tuning though my af is 10.5 across the board had to stop tuning cause I got pulled over doing a 4th gear pull-we all know how fast that is.-got lucky only got warning.)
(still tuning though my af is 10.5 across the board had to stop tuning cause I got pulled over doing a 4th gear pull-we all know how fast that is.-got lucky only got warning.)
04-25-2007 | 11:28 AM
#9
Originally Posted by crewchief264
My emanage does the same thing. I directly soldered everything and no resistors/diodes. I also have the same starting problem. Ie my car never starts!!! Its like it floods out! I have deatchwerks injectors 550. If I push start and pop the clutch it fires right up! and runs fine.
(still tuning though my af is 10.5 across the board had to stop tuning cause I got pulled over doing a 4th gear pull-we all know how fast that is.-got lucky only got warning.)
(still tuning though my af is 10.5 across the board had to stop tuning cause I got pulled over doing a 4th gear pull-we all know how fast that is.-got lucky only got warning.)
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