I was driving today and my 7m developed an intermittent missfire under boost. Within a couple minutes it suddenly developed a dead cylinder. I stopped to investigate and #1 has zero spark from the coilpack. Number 6 still has spark, so does that mean that the coil pack has to be bad and it's not a wiring issue?
7MGTE lost spark only on cylinder #1
- Thread starter jake8790
- Start date
Yes, it is wiring issue, but not the coil pack. It is impossible to have your symptom and be the coil pack. Now you need to change the high tension cord.
jake8790;1960308 said:
Unless you broke the stud, that can not happen.
jake8790;1960308 said:
You are not seeing obvious physical damage. There is one coil for each pair of cylinders. The only way to do what you claim is if the stud was broke. If the stud was broke, the plug boot would not fit right. You would know it.
Coils I would assume. But I had the exact same thing happen to my car. I don't know exactly what was causing it.. but I only had one dead cylinder, and it turned out the coil was bad.
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I can't really think of a good reason it would do what you have in the video. Toyota implies the two ends complete the circuit. I am the one that is missing something.
I understand what you're saying. If one side was dead and shorted to ground then the whole coil should fire through that side.. correct? Path of least resistance? I am going out on a limb here and thinking there was corrosion where the plug wire hooks up, and enough built up to the point of having a dead cylinder.
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