No Ignition Mercruiser 350 Mpi
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No Ignition Mercruiser 350 Mpi
I recently bought a boat with a 99 350 MAG MPI / BRAVO 1. Engine had head gasket issues and engine was already partially dismantled. I replaced both gaskets and completed the engine.
Engine is not firing up, no ignition (no spark at the plugs)
I can hear the fuel pump working for a couple seconds when turning the switch on.
When switch is in “on” position, I have 12V at the + side of the coil (red wire)
But I also continuously have 12V at the negative side of the coil (white wire), (not only when switch is on, but also when cranking)
At the distributor, only 2 wires; white/green which is connected to purple/white and red/white which is connected to pink wire.
What’s the problem? How to test the distributor?
Anyone an electrical scheme?
Engine is not firing up, no ignition (no spark at the plugs)
I can hear the fuel pump working for a couple seconds when turning the switch on.
When switch is in “on” position, I have 12V at the + side of the coil (red wire)
But I also continuously have 12V at the negative side of the coil (white wire), (not only when switch is on, but also when cranking)
At the distributor, only 2 wires; white/green which is connected to purple/white and red/white which is connected to pink wire.
What’s the problem? How to test the distributor?
Anyone an electrical scheme?
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Thx fast reply, wished it was that easy…
I grounded the – side of the coil directly to the battery (better discription would be "court circuiting" seeing the sparks…
With white (negative) wire disconnected, always 12 v on the – side
When properly grounded, no 12V at the – side, but no changes when cranking, so distributor is not intermittent???
Replaced coil by spare one (good working order???) , no luck, same issues
What’s next???
I grounded the – side of the coil directly to the battery (better discription would be "court circuiting" seeing the sparks…
With white (negative) wire disconnected, always 12 v on the – side
When properly grounded, no 12V at the – side, but no changes when cranking, so distributor is not intermittent???
Replaced coil by spare one (good working order???) , no luck, same issues
What’s next???
#4
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bad control module inside distributor if it doesnt have points style
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#6
Negative teminal of coil should not go to ground. I had the same issue when putting my engine back in after a long layup with no engine. Neg side should have 2 grey wires, one goes into harness and leads to the tach, the other leads to the ignition pickup coil in the distributor. + side of coil will have 2 purple wires, one coming from harness (and ign key), the other goin to distributor. Distributor also had the white/green and white/red wires coming out of it and going to the ignition module on the exh riser.
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According to the merc fault diagnosis, I disconnected the wht/red wire and there is 12V
Striking the coil lead to a grounded wire, no spark
When disconnecting the wht/green wire (after grounding the coil/distributor lead) and intermittently striking to a ground no spark!
Only when striking with a grounded wire to the negative (-) side of the coil, I can see a very small spark out of the coil lead
I replaced coil again (3° coil) still no spark
I replaced the distributor sensor, leads and cap, still no spark
Finally I replaced the ecm module, still no spark
Meaning I almost replaced the whole ignition system and still no good
What’s next to try?
Striking the coil lead to a grounded wire, no spark
When disconnecting the wht/green wire (after grounding the coil/distributor lead) and intermittently striking to a ground no spark!
Only when striking with a grounded wire to the negative (-) side of the coil, I can see a very small spark out of the coil lead
I replaced coil again (3° coil) still no spark
I replaced the distributor sensor, leads and cap, still no spark
Finally I replaced the ecm module, still no spark
Meaning I almost replaced the whole ignition system and still no good
What’s next to try?
#8
According to the merc fault diagnosis, I disconnected the wht/red wire and there is 12V
Striking the coil lead to a grounded wire, no spark
When disconnecting the wht/green wire (after grounding the coil/distributor lead) and intermittently striking to a ground no spark!
Only when striking with a grounded wire to the negative (-) side of the coil, I can see a very small spark out of the coil lead
I replaced coil again (3° coil) still no spark
I replaced the distributor sensor, leads and cap, still no spark
Finally I replaced the ecm module, still no spark
Meaning I almost replaced the whole ignition system and still no good
What’s next to try?
Striking the coil lead to a grounded wire, no spark
When disconnecting the wht/green wire (after grounding the coil/distributor lead) and intermittently striking to a ground no spark!
Only when striking with a grounded wire to the negative (-) side of the coil, I can see a very small spark out of the coil lead
I replaced coil again (3° coil) still no spark
I replaced the distributor sensor, leads and cap, still no spark
Finally I replaced the ecm module, still no spark
Meaning I almost replaced the whole ignition system and still no good
What’s next to try?
#9
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Bypassing the 12V + wire, I already tried which didn't changed anything
Does someone has a good electrical schema for this particular engine?
350 Mag Mpi 99 TBV ignition Bravo setup
Does someone has a good electrical schema for this particular engine?
350 Mag Mpi 99 TBV ignition Bravo setup
#10
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sorry dude wasnt thinking when i replied to you earlier.
1- white wire should go to neg side of coil
2- red wire to pos side of coil
3-wht/red wire from distrib. wheel sensor should be connected to the pink wire
4-white/green wire from distib. whhel sensor should be connected to the purp/white wire.
also google code 45 (coil driver fault) this fault code should guide you on how to troubleshoot your coil wiring. good luck
1- white wire should go to neg side of coil
2- red wire to pos side of coil
3-wht/red wire from distrib. wheel sensor should be connected to the pink wire
4-white/green wire from distib. whhel sensor should be connected to the purp/white wire.
also google code 45 (coil driver fault) this fault code should guide you on how to troubleshoot your coil wiring. good luck