Rattling sound and dropping RPM

Tiny
THORNOFCARRION
  • MEMBER
  • 2005 TOYOTA VITZ
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 65,000 MILES
Getting two problems:
1. The car drops RPM and my car vibrates in low speed or in standing position.

2. I get a rattling sound in low speed.
Tuesday, January 11th, 2011 AT 6:37 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This could be a number of things, but I am going to suggest we start with two things. First and foremost, we should check for codes even if the light is not on.

Here is a guide that will help with this:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If there are no codes, then we should check and see if there is a vacuum leak. I suspect this is going to be the issue so here is a guide that will help with locating it:

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

Depending on the results of this info we can also determine what is happening by watching the o2 sensor data. I am attaching a guide that will help with determining what the short-term fuel trim data means. I suspect this will show it is lean and if that is the case then we do have a vacuum leak or low fuel pressure.

Here is a guide that will show how to check fuel pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please see below and let us know what you find with this, and we can go from there.

Thanks
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Friday, February 25th, 2022 AT 7:04 PM

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