My car runs rough when I turn on the ac... why?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

alkon - 31 Jul 2007 22:45 GMT

I have an old 91 Toyota Camry with a V6 engine. It is a great running
car except for a recent problem. I am finding that when I have the ac
on, it runs very rough in idle. When I cut the ac off, it runs just
fine. Is this because it is overcharged?? Any other possibility?

Thanks, Al Kondo

Reply to this Message

E Meyer - 31 Jul 2007 23:26 GMT

On 7/31/07 4:45 PM, in article
1185918325.412845.109760@b79g2000hse.googlegroups.com, "alkon"

> I have an old 91 Toyota Camry with a V6 engine. It is a great running
> car except for a recent problem. I am finding that when I have the ac
> on, it runs very rough in idle. When I cut the ac off, it runs just
> fine. Is this because it is overcharged?? Any other possibility?
>
> Thanks, Al Kondo

There is a mechanism that speeds up the idle when the AC is on to account
for the extra load on the engine. Sounds like yours is broken. Should be a
relatively inexpensive fix.

Reply to this Message

alkon - 01 Aug 2007 19:23 GMT

> On 7/31/07 4:45 PM, in article
> 1185918325.412845.109...@b79g2000hse.googlegroups.com, "alkon"
[quoted text clipped - 10 lines]
> for the extra load on the engine. Sounds like yours is broken. Should be a
> relatively inexpensive fix.

I drove my car today and found that the idle was at 700 rpm with the
ac on. Shouldn't it be higher? Also, I seemed to be getting some
rough idling even with the ac off as well. I will investigate other
causes of my problem in addition to the ac possibilities.

Thanks, Al Kondo

Reply to this Message

Comboverfish - 01 Aug 2007 20:01 GMT

> > On 7/31/07 4:45 PM, in article
> > 1185918325.412845.109...@b79g2000hse.googlegroups.com, "alkon"
[quoted text clipped - 17 lines]
>
> Thanks, Al Kondo

Be sure not to follow up with the fix in typical Al Kondo style.
Usenet is soley for your benefit. Thanks in advance.

Toyota MDT in MO

Reply to this Message

Don - 01 Aug 2007 04:58 GMT

>I have an old 91 Toyota Camry with a V6 engine. It is a great running
>car except for a recent problem. I am finding that when I have the ac
>on, it runs very rough in idle. When I cut the ac off, it runs just
>fine. Is this because it is overcharged?? Any other possibility?

Old collapsed motor mounts no longer absorb engine vibrations as well
as when a car is new. If the AC is on the motor is working harder.
Typically the problem is the very worst idling in drive with AC on.

Don
www.donsautomotive.com

>Thanks, Al Kondo

Reply to this Message