94 automatic Vibrates at standstill in Drive ( but not while in Neutral)

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Old 22 Apr 2005, 04:38 pm   #1 (permalink)
Henny bogan
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Default 94 automatic Vibrates at standstill in Drive ( but not while in Neutral)



Once the car is warmed up - not when it is cold, the car has quite a
bit of vibration while at a red light. I noticed that if I threw it
into neutral it totally stopped.

I explained to my mechanic and he had the "deer in the headlights"
look.

He already changed to motor mounts to fix this and frankly it did
nothing but cost me a lot of money.

Any advice on this would be appreciated.

Barry

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Barry
Glen Head NY
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Old 22 Apr 2005, 05:43 pm   #2 (permalink)
m Ransley
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Default Re: 94 automatic Vibrates at standstill in Drive ( but not whilei...

That is normal for a car needing a tune up. I had plugs with 17000 on
them. Changing to Bosch 4 cured it. If wires cap and rotor are original
replace them. You don`t say what the idle is, a stretched timing belt
will retard timing , reducing power , milage and idle. Were your mounts
broke or was your mechanic broke.

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Old 22 Apr 2005, 09:31 pm   #3 (permalink)
Philip
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Default Re: 94 automatic Vibrates at standstill in Drive ( but not while in Neutral)

Henny bogan wrote:
> Once the car is warmed up - not when it is cold, the car has quite a
> bit of vibration while at a red light. I noticed that if I threw it
> into neutral it totally stopped.
>
> I explained to my mechanic and he had the "deer in the headlights"
> look.
>
> He already changed to motor mounts to fix this and frankly it did
> nothing but cost me a lot of money.
>
> Any advice on this would be appreciated.
>
> Barry


I assume the engine is tuned properly (not idling too low) and is not
misfiring. OTHERWISE, the vibration you are experiencing in Drive is normal
for any four cylinder engine. Some makes do a better job of isolating this
vibration (due to 180 degree crank throw spacing that all four cylinder
engines feature) than others. But the -tendency- will ALWAYS been there.
Raise the idle speed a little bit and you'll notice a sharp decrease.
Nature of the beastie.
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- Philip



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Old 23 Apr 2005, 09:55 am   #4 (permalink)
Henny bogan
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Default Re: 94 automatic Vibrates at standstill in Drive ( but not while i...

I actually found a site that said that Toyota will send new mounts -
that this was a widespread problem. After I put up my post of course

www.cartalk.com/content/columns/ Archive/1996/September/06.html


thanks for the input!

Barry


In article <14846-42697E22-46@storefull-3132.bay.webtv.net>, m Ransley
<ransley@webtv.net> wrote:

> That is normal for a car needing a tune up. I had plugs with 17000 on
> them. Changing to Bosch 4 cured it. If wires cap and rotor are original
> replace them. You don`t say what the idle is, a stretched timing belt
> will retard timing , reducing power , milage and idle. Were your mounts
> broke or was your mechanic broke.
>

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Old 23 Apr 2005, 09:59 am   #5 (permalink)
Daniel
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Default Re: 94 automatic Vibrates at standstill in Drive ( but not while in Neutral)

http://www.redlineoil.com/products_fueladditives.asp

Read the technical data section - safe for continuous use, Toyota four
cylinder benefits after 10,000 miles, but you may also notice some
immediate improvement.
The main idea, is cleaning the valve faces and injectors to equalize
each cylinder resulting in a smoother idle plus the side benefit of
better overall power.
Much of the efficiency of the Toyota four cylinder engine derives from
the four valve per cylinder engine configuration, so if the breathing
capacity is even slightly restricted over time, there can be an adverse
effect.
Check the spark plug wires also. One of mine had been shorting inside
the spark plug tube near the bottom, although that type of weak spark
was more apparent under load, ie., acceleration. I just used the
service manual recommendation of not more than 25K ohm resistance per
wire, and two showed infinite resistance.
For my money, you want to stay with factory stock plugs for Toyota. The
Bosch have a very small center electrode prone to fouling. ND should be
the stock plug if needed.
Wouldn't hurt to also check the PCV valve (and grommet also if you
replace).
Not sure this would have an effect, but always a good idea to check the
transmission fluid also, should be relatively clean, not darkened from
overheating or extended drain intervals.
Also may be helpful to check accessory drive belt tension. This is a
maintenance item that is often over looked.
Power steering fluid another item to check for condition. There doesn't
seem to be an official service recommendation, but old dirty fluid
can't be good for the system. May not be affecting your idle though.
Just ideas. Areas to check.
By keeping up on all the maintenance items, have found the four
cylinder vibration at idle in Drive quite minimal.

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