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Why do I have to turn ac off while stopped at traffic-lights because engine wants to push car forward?
Wiki User
∙ 15y ago
The best I can do is to guess, so bear with me.
When your AC is on, it places quite a burden on the engine.
You can probably hear the RPM's drop when you turn the
AC on. In a car with a big V8 engine, this is no big deal. The
amount of power "stolen" by the AC compressor, compared
with the total power available, is negligible. BUT, in our little
4 bangers, that ratio changes considerably.
When you're stopped with the AC on, the car just doesn't
idle quite as fast as it does with the AC off. I don't really know
if there is something that's supposed to compensate for this or
not, but I don't think so.
But on to your pushing problem. I would guess that at idle with the
car in gear and the AC running, your idle is not consistent. It may
be fluctuating and when the RPM's come up, you have more power
to the car and it wants to move. When the RPM's drop, this tendency
stops. I'm wondering if your engine is surging. Is this something you've
encountered with the AC off and the car in park? The engine speed rising
and falling? If so, I'd look for a vacuum leak under the hood. Have a look
at all the hoses and make sure they're in good condition and connected
tightly.
If this doesn't help, it may be time for a tuneup. If it's been a while since you
replaced plugs, plug wires and the fuel filter, I'd start there and see what
happens. It couldn't hurt to run a container of injector cleaner through the
gas tank either.
FriPilot
Wiki User
∙ 15y ago
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