Excessively jerking at idling (high engine vibration)?

MALLYBOY

MEMBER
2006 TOYOTA CAMRY
2.4L
4 CYL
2WD
AUTOMATIC
106,786 MILES

This vibrates excessively to the extent that it causes discomfort while idling. A lot of steps have been taken such as engine replacement and some other components, but it doesn't solve it. When you start this vehicle first thing in the morning, it will idle fine and after 15 minutes you will begin to notice slight misfire on all the coils. Then I began to trace the fault and noticed that on coil connector there was Resistance on terminal 1(coil power) and terminal 4(coil ground) that is Short to Voltage and ground and it is applicable to all the coils. Which components are switching this terminals to suffer this vehicle?
I have loosened the Dashboard to see if I can see where components were burnt may be R/B power distribution box, but I haven't seen, what do you think can cause this problem?

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,722 POSTS

Is the check engine light on? If so, we should turn the codes to see what comes up. Here is a guide to help, also let's do a compression test to make sure the engine is okay. You could have an ECM that is going out.

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

and

https://www.2carpros.com/articles/how-to-test-engine-compression

When you remove the spark plugs check the condition to see if one looks different than the rest. This will be the cylinder that is having the problem. Please go over these guides and report back.

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Thursday, January 19th, 2023 AT 10:35 AM

MALLYBOY

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309 POSTS

Hi!
I have come to tell you that I finally trace the fault by isolating the power cable on terminal 1 of coil connector and I used a difference cable to run it to all the coils and I also isolate the ground cable and use another cable to run it and tighten it on different location. Now I cranked the vehicle and allow to idle at 934 RPMs, It idles for 40 minutes without jerking or misfiring, I turn on the A/C instead of the ECM to increase the RPM to 1,100 RPMs, it drops to 880 RPMs and it begins to do slight jerking, at this point I suspect that the throttle body did not reach target idle to control the engine. How do I adjust or calibrate the throttle angle for this vehicle to maintain 1,100 RPMs at engine idling load?

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Thursday, January 19th, 2023 AT 11:36 AM

KEN L

MASTER CERTIFIED MECHANIC
47,722 POSTS

The PCM will not allow you to adjust idle speed, and there is no adjustment because the throttle body is sealed unit. Can you upload a short video of what the engine is doing? Is the engine misfiring at idle?

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Friday, January 20th, 2023 AT 9:33 AM

MALLYBOY

MEMBER
309 POSTS

Is it not possible that I can use scanner to increase the Throttle Angle at Idle?

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Friday, January 20th, 2023 AT 11:48 PM

KEN L

MASTER CERTIFIED MECHANIC
47,722 POSTS

I don't think so, it is set by the PCM. I would check for a vacuum leak when the engine is cold only.

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

Please go over this guide and report back.