Idle fluctuates between 800 and 1,700 RPM in park

FOXDEN

MEMBER
2000 TOYOTA CELICA
1.8L
2WD
AUTOMATIC
129,000 MILES

Engine was replaced. There was no problem before that. We have replaced the O2 sensors, mass air flow sensor and idle sensor.

Friday, September 18th, 2020 AT 9:34 AM

8 Replies

KASEKENNY

MECHANIC
18,907 POSTS

When you replaced the engine was this a used engine and what was swapped over from the old engine? Meaning was the fuel injectors from the old engine or did they come with the used engine?

If this was a new engine, same question. Do you know what was swapped from the old engine?

Lastly do you still have the old engine?

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Friday, September 18th, 2020 AT 10:52 AM

FOXDEN

MEMBER
22 POSTS

It was a used engine. JDM was the seller on e-bay. It was to have between 50,000 and 65,000 on it. I do not recall if the injectors were swapped or not. It has been over a year since it was swapped. I no longer have the old engine.

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Sunday, September 20th, 2020 AT 7:12 AM

KASEKENNY

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18,907 POSTS

Okay. So this issue just started and it was running fine until now?

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Sunday, September 20th, 2020 AT 6:41 PM

FOXDEN

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22 POSTS

No, my son it idled a little high after we switched it out. Runs well except the idle.

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Monday, September 21st, 2020 AT 4:32 AM

KASEKENNY

MECHANIC
18,907 POSTS

Okay. I am sorry for asking this a number of times but it helps to know the history. The fluctuating idle between 800 and 1700 was not happening after the engine was replaced a year ago. The idle was higher but the fluctuating just started?

Fluctuating idle is most likely a vacuum leak. Here is a guide that we need to check and rule this out:

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