Drivability with air conditioning - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Yagz · 12-18-2004, 20:18

Heya guys..

Just wondering if anyone else here with a manual V8 finds that with air con on the car jerks alot, clunks, etc when shifting gears? I know the air con sucks alot of power, but the drivability lately with the aircon on has forced me not to have it on unless i am cruising in 5th.

It's gotten to the point where i have to have it turned off, because the drivability is useless!

With aircon off, it's fine..

Any ideas?

Cheers,
Yagz

banarcus · 12-19-2004, 13:33

Never mate. Mine runs fine even at night with all accessories on and its a Fairmont.

Brad · 12-20-2004, 00:15

Quote:

Originally Posted by Yagz

Heya guys..

Just wondering if anyone else here with a manual V8 finds that with air con on the car jerks alot, clunks, etc when shifting gears? I know the air con sucks alot of power, but the drivability lately with the aircon on has forced me not to have it on unless i am cruising in 5th.

It's gotten to the point where i have to have it turned off, because the drivability is useless!

With aircon off, it's fine..

Any ideas?

Cheers,
Yagz

mine used to do exactly the same thing. Never found out why cause when i stroked my motor and installed it again its being fine, works perfectly now. I used to push the clutch in to change gears and it would try to stall if you were'nt quick enough. Just stroke ur engine and it will be fine haha

Extreme_2020 · 12-20-2004, 02:19

Mine runs smooth as with AC and headlights on at the same time!

Dunno what would be wrong with yours...it could be that the ECU isint being told the AC is on, and not compensating for it?

Just a stab in the dark

Extreme

ebxr8240 · 12-20-2004, 04:31

Could be your battery has a dead cell as it seems volt related..?
Try turning throttle screw up 1/4 turn ???
Idle rpm could be alittle low??
Plugs and leads in good cond ???

Philaddis · 12-20-2004, 17:44

Could be your stepper motor. (Idle speed control unit). Check that all the wires are attached and that the idle adjusts itself when you turn the A/C on.

A mate of mine had an EB V8 that was doing exactly what you described and it turned out the be the stepper motor wasn't operating correctly. (adjusting idle for extra load on the car).

Yagz · 12-20-2004, 17:59

Nah, it's not so much that the revs are dropping out.. the idle's fine, and the revs are good, it's more the fact that it feels like there's a heap more extra load on the engine, and the clutch operation/driveline shunts, and every gearchange is jerky..

ebxr8240 · 12-20-2004, 20:40

YES maybe too low rpm and eec is trying to incease rpm also low rpm means more load on battery as there is no or little charge..Magnifying the situation....
Not sure but is there a switch on your clutch nr your peddal box ??It may not be working, it tells eec to increase rpm alittle to prevent these issues....

XplodEd EA · 12-21-2004, 00:00

Mine too has no trouble with the A/C on.

Could be just the way you drive dude.

Citric XR6 · 12-23-2004, 21:17

I know what your'e talking about. My BA XR6 manual had the same problem. I think it just a case of loose drivelines and the A/C compressor cutting in and out at bad times. Get an auto and you'll hardly know its on.