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Check Engine Light is on and the car is shaking?

Tiny
MICHAELIU
  • MEMBER
  • 2000 TOYOTA SIENNA
  • V6
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
The check engine light is on but it’s not flashing. It has a weak ignition, so when I started the engine, its power was not that strong. And when I hit the accelerator slightly the car shakes but if I hit it strong and the speed comes up, it doesn’t shake. In addition, when I hit the brake and the speed goes down it starts to shake again. What is more, the battery is old.
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Tuesday, August 29th, 2023 AT 3:11 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

You need to start by having the computer scanned for diagnostic trouble codes. Since the light is on, there will be codes stored. Here is a link that explains how it's done.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Also, most parts stores will scan the computer for you free of charge, so have that done.

Next, often times a rough idle is caused by an engine vacuum leak. I would check to see if you can locate any.

Here is a link that explains how to do it:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know if you have already tried these two things. If you have and have codes, let me know what they are.

Take care,

Joe
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Tuesday, August 29th, 2023 AT 7:37 PM

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