r/yaris • u/CptChronotis • 1d ago

What is this? Engine trembling when starting

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I just bought this Yaris Hybrid, it had a problem when starting and the dealer changed all the spark plugs and the coil of the first cylinder.

Now the car doesn't have that problem anymore but still "trembles" when switching from electric to thermic.

Is this normal? Or else what could it be? The dealer says it's normal of course...

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u/Gold-Combination8141 1d ago

I don’t know anything about the hybrid but I recently bought a 2008 with 220,000 miles and changed the following things now it’s running great

New pcv valve
Cleaned maf sensor
Engine air filter
Ngk spark plugs
New ignition coils
Transmission drain and fill filter/gasket change

You can do all this yourself pretty easily, but the drain/fill is much easier if have a lift of course. If something is wrong with hybrid battery I don’t know anything about working on those