Problem on cold start

I've got an n/a automatic. It's been running perfectly for ages but since the cold/damp mornings have come along has developed an odd problem.

It starts up first time idling at about 1300 which is normal (when warmed up this drops to about 700).

The problem occurs when I try to pull away. I'll move a few yards and then the revs suddenly drop to way below 1000. I let off the accelerator revs go back up. Try to gently accelerate again and the same thing happens. After that, the car pulls away absolutely fine and I don't have any problem for the rest of the day.

Any idea what might be causing this.

Thanks

Tony

1300 cold idle in an NA sounds a bit low. I'd expect around 2000rpm. It might not be linked to your problem, but just a thought...

1300 cold idle in an NA sounds a bit low. I'd expect around 2000rpm. It might not be linked to your problem, but just a thought...

Maybe. It could be a bit higher than 1300 but it's never been 2000 and I've had it nearly three years now.

N/A's usualy idle around the 1700 mark. Well all the 1s ive been in have done anyway

N/A's usualy idle around the 1700 mark. Well all the 1s ive been in have done anyway

Maybe I've got that wrong. I'll check later.

MY NA idles at 800 when it's warm and has done for years according to MOTs etc.

When it's cold it's up at 1500+ and nearer 2000 when i turn the lights and heaters on at first.

Idle speed will be different depending on whether it's in park or drive (with the brake on) too, and as Martin says if you've got the blower on it'll be different again.

Sorry Tony, don't know the answer to your question...maybe a sticking throttle cable?

Could be your battery on it's way out, do all the lights dim down when the rev's drop?

Ok. Checked and cold idle is around 1500. After the problem yesterday morning the car stood outside all day until 8pm, started and drove off no problem. This morning it did it again.

My N/A manual, in the three weeks I have had her anyway, idles at 2,000rpm when switched on first in the cold mornings - drops down to around 700rpm or so when warmed up.

Tony, have you had it serviced recently? Is the air filter in good condition?

Tony, have you had it serviced recently? Is the air filter in good condition?

No I haven't. Probably a good idea with the cold weather on the way.

Tony, have you had it serviced recently? Is the air filter in good condition?

Check ht leads, rotor arm and cap, plugs, air filter etc and reset ecu.

Maybe do a search on n/a cold start valves or whatever they use.