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From: dvo on 16 Jul 2007 21:29
Drive a 1992 Toyota Camry LE. Car warms up, drive a few miles and it idles
rough and has no acceleration. Open hood, unplug vacuum hose to vacuum
sensor assembly. Car stalls. Refasten the vacuum hose to assembly.
Problem solved. Drive for a few miles and car goes through the same
sequence. What is wrong and how can I troubleshoot this problem in order
to fix it?

From: johngdole on 21 Jul 2007 01:04
In many older cars, many engine functions are controlled by vacuum.
For example, the EGR valve on Camrys are operated by varying vacuum to
the valve. You may have a leaking hose that affects the accuracy of
the vacuum signal to the parts that cause rough idles, stalls, etc.

Just about all newer cars use electronic control. Like the GM EGR
valve from a few decades ago started using stepper motors to control
the EGR valve lift. The accelerator pedal on BMWs control the amount
of air intake by Continuously Variable Valve Lift -- they use no
throttle plates! And yes, Camrys still use good 'ol jack screws to set
belt tensions.

In any case you should not disable the control signals by unplugging
vacuum lines. Check for vacuum leaks and replace gaskets or bad
hoses.



On Jul 16, 6:29 pm, "dvo" <good...(a)hotmail.com> wrote:
> Drive a 1992 Toyota Camry LE. Car warms up, drive a few miles and it idles
> rough and has no acceleration. Open hood, unplug vacuum hose to vacuum
> sensor assembly. Car stalls. Refasten the vacuum hose to assembly.
> Problem solved. Drive for a few miles and car goes through the same
> sequence. What is wrong and how can I troubleshoot this problem in order
> to fix it?


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