Engine idles at 3,000 RPMs when hot

KONE NOREFA

MEMBER
2014 TOYOTA MR2
2.1L
6 CYL
2WD
128,949 MILES

I changed spark plugs, plus new valve seals and piston rings, changed throttle position sensor but still same. No smoke, no overheating engine running smoothly just high idles.

Tuesday, March 8th, 2022 AT 11:38 PM

7 Replies

KASEKENNY

MECHANIC
18,907 POSTS

There are a number of things that can cause a high idle. so here is a guide that will help with getting us started:

https://www.2carpros.com/articles/engine-idles-too-high

The most common of all these is an intake air sensor that is not reading correctly as the engine heats up or there is a vacuum leak opening up when the engine gets hot.

So, I would suggest starting with checking for a vacuum leak. Here is a guide that will help with this:

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

Let's start with this and let me know what you find, and we can go from there. Thanks

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Thursday, March 10th, 2022 AT 4:38 AM

KONE NOREFA

MEMBER
4 POSTS

Thanks, very much for your help and support I have found the problem, it's the gasket for the throttle body.
Best regards.

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Friday, March 11th, 2022 AT 7:56 AM

KONE NOREFA

MEMBER
4 POSTS

Hi Ken,

Everything running ok but engine idle going up and down when air condition on.
What do you think is the problem?

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Monday, March 14th, 2022 AT 10:20 AM

KASEKENNY

MECHANIC
18,907 POSTS

That is good news. This could be normal depending on how much it is ranging. Basically, when you add this load the idle will go up when the compressor is engaged and then drop when it is off.

However, if this is ranging a lot, let's get a new post started because I am sure others will be interested in that repair if they have the same issue. They just won't find it under this heading.

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Monday, March 14th, 2022 AT 2:18 PM

KONE NOREFA

MEMBER
4 POSTS

Hi Ken, I am currently working on a RAV4 1az engine and I have found 3errors which I will attach.I have changed the pedal position sensor and the throttle body, but cannot RAV more than 2000 rmp.