JcL Posted September 9, 2022 Report Share Posted September 9, 2022 Hello everyone, I just finished my project, a fiat with a 1.2 8 valve engine with a turbocharger. I have a problem with my moonsoonX I can't start the engine. I explain a little my setup: 4 ignition coil one per cylinder , fuel injectors one per cylinder in size 240cc at 4bar fuel pressure. -vr crank sensor in trigger 1 input. -crank trigger wheel 60-2 cyl1 in tdc in tooth 17. -hall cam sensor in trigger 2 input. -cam trigger wheel 1 tooth. -1 single tooth 40-50 degree before tdc cyl1 combustion stroke. I adjust my ignition with my timing light at -94º offset and get my 10º timing aligned with the original flywheel mark. It is the only point that I get that the brand concides. the only thing I get is a very very slight explosion in the exhaust, but zero attempt to start... attached basemap , log startup and log trigger scope. Currently I feel stuck and I don't know where to act and I'm desperate, I appreciate any help you can offer me. Thanks in advance Quote Link to comment Share on other sites More sharing options...
JcL Posted September 9, 2022 Author Report Share Posted September 9, 2022 I attach photos of things that may be interesting... the signal from the cam sensor is correct? use a hall sensor, powered with 5v, sensor ground gnd and connected according to the photo. photos: https://ibb.co/SrtxyWw https://ibb.co/MCtgShb https://ibb.co/0fww2xS https://ibb.co/tCrDjZ1 Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 9, 2022 Report Share Posted September 9, 2022 Everything looks good in the log and scope. Your trigger offset is possibly 360 deg out so you are sparking on exhaust stroke rather than compression stroke. Try the offset at 266deg. Quote Link to comment Share on other sites More sharing options...
JcL Posted September 10, 2022 Author Report Share Posted September 10, 2022 thanks adam for answering I changed the offset to 266 degree and I can't start the engine... in fact today I have not got any explosion in the exhaust neither in -94 nor in 266 degree. I was playing with the master fuel (8-14-20ms) in case it wasn't enough fuel to start but nothing. My afr meter reads around 13afr. Remove the entire fuel and put new fuel recently purchased. Checked the compression cylinder , it is in the expected 150psi. New spark plugs and check the injectors and coils in test mode and all work correctly, each one in its output. I don't know what to think or do anymore... could it be that the spark from the coils is too weak inside the cylinder? outside looks good. the coils and injectors are wired like this.. IGN1 and INJ1 - CYL1. IGN2 and INJ2 - CYL2. IGN3 and INJ3 - CYL3. IGN4 and INJ4 - CYL4. Firing orden in pclink set 1-3-4-2. I use a oem coil of this type, in falling spark edge mode. the coil works fine and doesn't get hot. I feel exhausted, I can't get anything... thanks Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 10, 2022 Report Share Posted September 10, 2022 That is a dumb coil. Have you fitted an ignitor as well? Quote Link to comment Share on other sites More sharing options...
JcL Posted September 10, 2022 Author Report Share Posted September 10, 2022 Not ignitor installer , coil direct to ecu. could the fault be there? Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 10, 2022 Report Share Posted September 10, 2022 Yes, that coil cannot be directly connected to the ecu, it will need a 4 channel ignitor to drive it. You will have only a very weak spark, as soon as there is compression or combustion there will not be enough energy to spark. Quote Link to comment Share on other sites More sharing options...
JcL Posted September 10, 2022 Author Report Share Posted September 10, 2022 ok understood. Since the coil is also used and I don't know what state it is in, I'm thinking of buying 4 independent coils. Due to the little space available, I cannot mount pencil coils with igniter built-in, can I use 4 coils of this type? I think they have an integrated igniter and I get them fast and cheap here. Tranks very much adam Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 10, 2022 Report Share Posted September 10, 2022 What engine is this coil from? Quote Link to comment Share on other sites More sharing options...
JcL Posted September 10, 2022 Author Report Share Posted September 10, 2022 Vw 1.4 engine aex. I was looking and for that engine the loose igniter is not sold and also in the photo I put before you can see the igniter in the lower part of the coil. This coil is for an engine with a distributor, would it be too much to mount 4 one for each cylinder? Will they be falling or rising? Thanks adam Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 10, 2022 Report Share Posted September 10, 2022 Yes 4 x AEX coil will be fine. Spark edge = Falling. Quote Link to comment Share on other sites More sharing options...
JcL Posted September 12, 2022 Author Report Share Posted September 12, 2022 Hi Adam, Thank you so much for all the help, engine now starts and runs fine. However when I turn on the ignition after shutting the engine off there is a massive explosion. All four coils generate a spark at the same time when I turn on the ignition switch. Any solution on this matter ??? it's very anoying.. Quote Link to comment Share on other sites More sharing options...
JcL Posted September 12, 2022 Author Report Share Posted September 12, 2022 Fixed, it was just too much fuel. now it runs fine. Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 12, 2022 Report Share Posted September 12, 2022 That is very odd, there should be no spark during power up? Quote Link to comment Share on other sites More sharing options...
JcL Posted September 12, 2022 Author Report Share Posted September 12, 2022 Well, every time I put the ignition switch on, the 4 coils discharge a spark... removing fuel from the fuel map 1, there is no longer an explosion when I put the ignition switch on again. Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 13, 2022 Report Share Posted September 13, 2022 I just checked your ECU serial number and there is a chance there is a hardware issue that is causing your spark at power up. We made a hardware change when this was discovered and your ecu serial number is right around the number this change was made. If you continue to have backfires at power up then contact [email protected] and they will arrange to get the ecu updated. k fuku 1 Quote Link to comment Share on other sites More sharing options...
jrdnclrk Posted September 20, 2022 Report Share Posted September 20, 2022 On 9/12/2022 at 4:34 PM, JcL said: Well, every time I put the ignition switch on, the 4 coils discharge a spark... removing fuel from the fuel map 1, there is no longer an explosion when I put the ignition switch on again. I've recently run into this issue when building the basemap for my 1.5jz i would have a single very loud backfire through the exhaust on key on. the solution to this problem was to have a ignition switch input to a Digital Input so the ecu knows when the key is on. and not having the ignition switch set to always on. it will also help with starting as the precrank prime feature can be set to while ignition switch is on. Just adding this input 100% solved this issue for me. i recommend using your DI3 input for this cause you dont have anything allocated to that yet. Quote Link to comment Share on other sites More sharing options...
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