TriggerScope

[Knox]

Hello, here is a trigger scope from g4+ kurofune ecu. Engine is 4g63, engine starts but see low vacum and also it reads rpm high between 1500-3500, sometimes even it writes rpm limit activated (loe ect rev limit is at 5000rpm). There is signal from both sensors but it counts trig1 error. I saw some fluctuations on scope, I'm not sure but may be the issue is cam sensor? Can someone check this trigger scope? If this is not the sensors what can be the issue? mechanical? 

 

Trigger Scope Log 2023-12-5 4;21;57 pm.llg

[Knox]

Any advice from link stuff ? 

[Adamw]

It looks like the cam timing is out.  Trig 2 should be about 40deg further to the left than yours is.

Pink line shows roughly what trig 2 should look like. 

  

[Knox]

4 hours ago, Adamw said:

It looks like the cam timing is out.  Trig 2 should be about 40deg further to the left than yours is.

Pink line shows roughly what trig 2 should look like. 

  

Hello Adamw,

Thank you for reply. What can be the issue? Engine starts and works fine before this issue starts, can it be a mechanical issue or bad crank sensor? Because when engine starts (but misfires) ecu see that engine revs around 1500-3500 and less often cold rpm limit (5000rpm). What are you advise to me to check ?

[Adamw]

Most likely the cam timing is out as I said.