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Idle speed Lower than 500 when first time start , what cuase it? 200

Hello:

My car,1986 245 with 140K +M46+OD, idle speed lower than 500 when first time start in coold morning last month. It happed 2 time last month.

Becuase it run well after start and the weather was cold last month, I do not pay attaention on it at that time.

But this afternoon, the weather is very warm, The low idle speed happend again.

The symptom is:
When I first time start, the idel lower than 500 and keep there untill I gave it some gas. After I gave it some gas, the idel up to 700--800 , and keep there.

I drive it , everything is good. When I stop in red light, the idel speed keep 700-800.

Then I stop the car and re-star it, the idel is 700-800.

After one hour,when I star it again, the idel speed lower than 500, gave gas, it up to 700-800 and keep there.

The idel speed is 900 before and today is very warm.

I think there is some thing keep worse that cuase idel speed un-normal.
I am afread my car will keep worse if I can not find the reason and fix it.

Any one have experenced this before?

Thanks.






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