Rough idle?

RWALBROEHL

MEMBER
2006 TOYOTA COROLLA
2.2L
4 CYL
2WD
AUTOMATIC
72,000 MILES

When idling car is not as smooth as it used to be. Cleaned throttle body with spray, changed air cleaner.

Thursday, November 3rd, 2022 AT 8:11 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

This can be a vacuum leak which I would test when the engine is cold only. here is a guide to help you also have you installed new spark plugs and coils. That is a problem with these cars, here is how to change them out as well:

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

Spark Plug Type:
DENSO .................... SK20R11
NGK .................... IFR6A11

Spark Plug Gap New - mm (in.): .................... 1.0 - 1.3 (0.039 - 0.051)
Torque: .................... 18 N.m (178 kgf.cm, 13 ft.lb)

This guide will help walk you through the replacement:

https://www.2carpros.com/articles/how-to-change-spark-plugs

Please go over these guides and report back.

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Thursday, November 3rd, 2022 AT 1:10 PM

RWALBROEHL

MEMBER
80 POSTS

I believe my 2006 Toyota corolla takes sk16r11 and not sk20r11 that you suggest. Could you double check that? Thanks, Robert

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Thursday, November 3rd, 2022 AT 5:04 PM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Hi Robert,

I show 1.8 liter engines for this car can you please confirm the engine size?

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Saturday, November 5th, 2022 AT 11:41 AM

RWALBROEHL

MEMBER
80 POSTS

Yes, 1.8 liter.

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Sunday, November 6th, 2022 AT 12:15 PM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

There are two different 1.8 liter engines here is the spark plugs for this option, L4-1.8L (1ZZ-FE)

Spark Plug Type:
DENSO. SK16R11
NGK. IFR5A11

Spark Plug Gap New - mm (in.):. 1.0 - 1.3 (0.039 - 0.051)

Torque:. 25 N.M (255 kgf. Cm, 18 ft. Lb)

Please let us know what happens.