hi,i have a toyota previa 2.4L engine came in with a dead missfire.
the other workshop already put a set of new ignition coil,but the car is still missfiring.
so my first step is to hook up my scope,
i checked the power feed,trigger signal,primary current ramp.
but i found that the current was extremely low,and the power feed voltage drops when the trigger is on.
it can hardly start the engine when the engine is hot,but even if we cold start the engine,the missfire will slowly coming and getting worse and dead.
i have few captures here.
- acr30 ignition feed current bad.psdata
- (443.34 KiB) Downloaded 150 times