car shakes/rough idle when in reverse

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Hello - 18 Jun 2005 16:14 GMT

92 Teg GS with just replaced engine. Whenever I'm about to back out of a
parkade or drive way, I shift in reverse and the car's idle would drop
enough to make the car shake. The idle stays lower and when I start turning
my steering wheel, it starts to shake even more.

What could be wrong? Why is it when I go in reverse, it seems to drop my
idle more than when I'm going forward?

Thanx in advance for any advice.

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Hello - 20 Jun 2005 04:14 GMT

Found out the reason the car shakes...because of the A/C compressor going on
and off when I have the A/C on. I just recently got my A/C recharged. When
I'm driving or at idle, I can hear a little "tick" sound coming from under
the dashboard. The "tick" sound I think is the A/C compressor turning on
and off to control the pressure in the A/C system. I think when the
compressor turns on, then my car shakes. Wonder why that is....could there
be AIR in the A/C system when it was recharged with R134?

> 92 Teg GS with just replaced engine. Whenever I'm about to back out of a
> parkade or drive way, I shift in reverse and the car's idle would drop
[quoted text clipped - 5 lines]
>
> Thanx in advance for any advice.

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Michael Pardee - 21 Jun 2005 06:25 GMT

> Found out the reason the car shakes...because of the A/C compressor going
> on and off when I have the A/C on. I just recently got my A/C recharged.
[quoted text clipped - 4 lines]
> is....could there be AIR in the A/C system when it was recharged with
> R134?

My guess is that the shaking is just from the increased load of the A/C
after recharge. It is pretty common, and sometimes recharging will even
cause a weakened part (like a compressor clutch) to fail. But recharging
when the system is low is still the right thing to do.

The shaking when the A/C on is normal, at least to some extent.

Mike

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