ihaveavibe wrote:I also have vibration at idle and it's starting to get annoying, so thread is very timely. Unfortunately, I have more questions for you guys and no answers:
How can you detect/diagnose the vacuum leak mentioned above?
There are different methods. Most common is to use a carb cleaner and spray it at suspected areas while the engine idles. If the engine reacts to the spray you found the vacuum leak. You can also use a length of a garden hose, hold one end to your ear and put the other at suspect parts along the intake. You may be able to hear a hissing sound.
Where is the IACV and same question, how can you diagnose it?
Somewhere at the throttle body, I believe
Is there any way to diagnose the condition of the motor mounts without removing them?
Visual inspection: Are there cracks? Put the gear in neutral and have someone stepping on the accelerator. Watch for excessive tilting of the engine
I am basically aware of three mounts, but some places I see references to a transmission mount. Where is this, and is this different from one of the three motor mounts?
See this thread: viewtopic.php?f=12&t=38461
Vibrologist mentions a balance shaft in I-4 engines. Does 1zzfe have that? I'm guessing not.
Your guess is correct.
Lastly, could it be the harmonic balancer? Or would that cause vibrations also at higher RPM, i.e. not just at idle?
I don't know
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