Bad vibration durign idle speed.

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dan.lacroix@gmail.com - 26 Feb 2008 01:34 GMT

My 1999 Toyota Tacoma vibrates badly during idle speed. I've taken it
to a few mechanics and they were unable to fix the problem. One
mechanic suggested changing the engine mounts. This fix didn't change
the vibration. The truck only gets the vibration after the car is
warmed up and once the RPMs drop below 1000. The performance of the
truck isn't effected by the vibration, its just annoying for driver
and passengers. Any ideas?

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Jeff Strickland - 26 Feb 2008 03:21 GMT

It sounds like it's missing.

Have you pulled codes to see if the computer is trying to communicate with
you?

Your truck is OBD II compliant, this means you can plug in a scan tool and
see what the computer thinks might be problematic. AutoZone will pull codes
for free, or give you the scan tool and let you do it. The data port is
located along the bottom of the dash, either completely exposed, or stashed
behind a cover that is clearly marked as containing a dianostic port behind
it. When you find the data port, it will remind you of an LPT2 printer
connector, except it only has 16 pins instead of the 40 pins found on the
printer. The look and feel of the pins is similar, that's why I describe it
that way.

Your truck can feel bad, and store a diagnostic code, but NOT turn the Check
light on. I think any problem that causes rough running at idle would set
the Check light on, but you should pull codes to see if the computer knows
something is not right with the universe.

> My 1999 Toyota Tacoma vibrates badly during idle speed. I've taken it
> to a few mechanics and they were unable to fix the problem. One
[quoted text clipped - 3 lines]
> truck isn't effected by the vibration, its just annoying for driver
> and passengers. Any ideas?

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jsacho@gmail.com - 27 Feb 2008 02:45 GMT

On Feb 25, 5:34 pm, dan.lacr...@gmail.com wrote:

Dan, I have an '07 Tacoma 2.7 L with a similar problem. The truck only
has 7000 miles on it and it ides very poorly when it is warmed up. The
idle is about 600 rpm If I increase the engine speed just slightly ,
maybe 50 rpm with the gas pedal it will smooth out. I have had it to
the dealer and they tell me everything is in spec and that no bad
codes were found. Basically they told me thats just the way it is. I
called Toyota customer service and they told me 4 cylinder engines
idle rough and it it doesn't bother most people! Well ...... It
bothers me and I plan to fix this one way or the other. The real
problem with this truck as I see it is that you cant adjust the idle
even a little. It is controlled by the computer and if the computer
says its OK then it must be OK. This may not be relevant to the 1999
Tacoma but I thought i would follow this topic for any ideas

joel

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johngdole@hotmail.com - 27 Feb 2008 02:58 GMT

I think a couple of weeks ago a 2.7 owner commented how smooth and
quiet the engine ran. Must be manufactured by a different Toyota! ;)

On Feb 26, 6:45 pm, jsa...@gmail.com wrote:

> Dan, I have an '07 Tacoma 2.7 L with a similar problem. The truck only
> has 7000 miles on it and it ides very poorly when it is warmed up. The
[quoted text clipped - 11 lines]
>
> joel

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johngdole@hotmail.com - 27 Feb 2008 03:00 GMT

Engine mount was a reasonable suspect. Also fuel injectors, fuel
filter (restriction), plugs, plug wires, valve clearance, timing. Just
some thoughts.

On Feb 25, 5:34 pm, dan.lacr...@gmail.com wrote:

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