kinko_ben Posted May 28, 2019 Report Share Posted May 28, 2019 My vehicle is MX-5 NA8 model (swapped to NB8 VVT engine) and controlled by MX5-Link plug-in I have setup triger1, triger2 and VVT solenoid as recommended in help. But sometimes I was facing “Trigger1 err” in the driving over the 5,000rpm. And when trriger1 err occurred, RPM has indicated around 15,000 to 20,000. So, hit rev limit and cut the fuel by engine protection function. I have done the following to resolve this issue. 1. Changed the Cam and crank angle sensor to new one.(triger1 and 2) 2. Connected sensor ground lines to chassis ground. that seems like resolved when the driving on the public road. A few days ago, I have driven on the truck and after several laps, I have faced this issue again in over the 5,500 rpm. Unfortunate I don’t have any log of that time. Does anyone experienced that issue like me? I hope someone gives any advice to me. regards Quote Link to comment Share on other sites More sharing options...
cj Posted May 28, 2019 Report Share Posted May 28, 2019 Sounds like you should run a trigger scope capture while holding rpm at just over 5500, maybe we will see some noise in the trigger signals Adamw 1 Quote Link to comment Share on other sites More sharing options...
kinko_ben Posted May 28, 2019 Author Report Share Posted May 28, 2019 6 hours ago, cj said: Sounds like you should run a trigger scope capture while holding rpm at just over 5500, maybe we will see some noise in the trigger signals Mr. CJ Thanks for your advise. currently i can't reproduce that issue easily. because it was occur on the truck with heated engine so will revert to old sensors and try to reproduce for trigger scope capturing. regards, Quote Link to comment Share on other sites More sharing options...
cj Posted May 28, 2019 Report Share Posted May 28, 2019 sometimes the trigger scope will show some noise or signal degradation, or signals wired backwards etc, even when its behaving normally, and from this we can see that if it was just a little bit worse you would have a problem. I'd suggest leave your sensors as they are (your last instance of this problem was with the same sensors you have now right?), warming the engine right up, then hold it at 5500-5700rpm and run a scope capture. Quote Link to comment Share on other sites More sharing options...
kinko_ben Posted May 29, 2019 Author Report Share Posted May 29, 2019 14 hours ago, cj said: sometimes the trigger scope will show some noise or signal degradation, or signals wired backwards etc, even when its behaving normally, and from this we can see that if it was just a little bit worse you would have a problem. I'd suggest leave your sensors as they are (your last instance of this problem was with the same sensors you have now right?), warming the engine right up, then hold it at 5500-5700rpm and run a scope capture. Hi cj, thank you for your clarification. one of cause of this issue was sensor, but it is not all. will see the trigger signal by trigger scope on the weekend! and will shield sensor harness and compare the signal with no shield. regards kinko_ben Quote Link to comment Share on other sites More sharing options...
kinko_ben Posted June 8, 2019 Author Report Share Posted June 8, 2019 On 5/29/2019 at 8:24 AM, cj said: sometimes the trigger scope will show some noise or signal degradation, or signals wired backwards etc, even when its behaving normally, and from this we can see that if it was just a little bit worse you would have a problem. I'd suggest leave your sensors as they are (your last instance of this problem was with the same sensors you have now right?), warming the engine right up, then hold it at 5500-5700rpm and run a scope capture. Hi, cj I have change plug cable to new one amd add new ground wire between battery- to engine block. also wrapped Crank and Cam Sensor harness using shield tube. but i have faced trigger1 error above 7,000 rpm sometimes. . I caught signal figure by trigger scope in the error. is this a noise ? as you can see, my cam trigger has three tooth. regards, Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 9, 2019 Report Share Posted June 9, 2019 Yes it appears to be some type of interference getting into the trigger circuit. You said earlier that you had connected sensor ground to chassis ground, that is the first thing I would undo. Does it have resistor spark plugs? What sort of coils does it have? Where are the coils grounded? Quote Link to comment Share on other sites More sharing options...
kinko_ben Posted June 9, 2019 Author Report Share Posted June 9, 2019 5 hours ago, Adamw said: Yes it appears to be some type of interference getting into the trigger circuit. You said earlier that you had connected sensor ground to chassis ground, that is the first thing I would undo. Does it have resistor spark plugs? What sort of coils does it have? Where are the coils grounded? Hi Adam, currently the sensor ground is connected to engine block. and both chassis ground and battery ground are connected to Engine block by OEM. yes, it has resistor spark plugs. wasted spark is given by two coils and grounded to chassis. Where should I connect sensor ground ? Thanks Quote Link to comment Share on other sites More sharing options...
Stevieturbo Posted June 9, 2019 Report Share Posted June 9, 2019 Sensor ground should only run from sensors to the sensor ground on the ecu...as the name kinda implies, and as the instructions tell you. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 10, 2019 Report Share Posted June 10, 2019 Normal practice is coils/ignitors should be grounded to the cylinder head and as per Stevies comment the sesnor grounds should be connected to ECU sensor ground only. These are the first things I would fix. Quote Link to comment Share on other sites More sharing options...
kinko_ben Posted June 10, 2019 Author Report Share Posted June 10, 2019 15 hours ago, Stevieturbo said: Sensor ground should only run from sensors to the sensor ground on the ecu...as the name kinda implies, and as the instructions tell you. 10 hours ago, Adamw said: Normal practice is coils/ignitors should be grounded to the cylinder head and as per Stevies comment the sesnor grounds should be connected to ECU sensor ground only. These are the first things I would fix. Steve and Adam, Thanks for your suggestion. I got means that sensor grounds should be connected to ECU sensor ground out. My G4+ is plug in model for MX-5 and all genuine harnes has connected to G4+. and OEM ECU has two ground out pin. One is connected to water temp , throttle position and O2 sensor ground. Another one is connected to cam, crank, air mass(with air temp) sensor and engine cylinder block. Since I have two questions. 1. Does two ground outs work on the MX5 Plug-in same as OEM ECU? 2. If 1. was YES, should I remove ground connection to the cylinder block for sensor ground? Regards, Quote Link to comment Share on other sites More sharing options...
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