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Question For Mechanics  
User currently offlineDAVID B. From United States of America, joined Jun 2001, 3148 posts, RR: 5
Posted (13 years 6 months 1 week 3 hours ago) and read 903 times:

Question for mechanics:

In cold weather gasoline engines tend to have a higher idle then normal. After a few minute, the RPMs fall back to normal. On a diesel this is different. The engine runs at normal RPM. If the driver wants to increase RPM, they have to step on the gas or hit the fast idle switch.

If gasoline engines can fast idle themselves why not diesels?

Teenage-know-it-alls should be shot on sight
3 replies: All unread, jump to last
User currently offlineMls515 From United States of America, joined Jun 2000, 3081 posts, RR: 8
Reply 1, posted (13 years 6 months 1 week ago) and read 893 times:

The fast idle on a diesel is not only for cold startups.

User currently offlineAdam84 From United States of America, joined Jul 1999, 1400 posts, RR: 2
Reply 2, posted (13 years 6 months 6 days 22 hours ago) and read 881 times:

I am going to venture to say it has to do with emissions.

Gasoline engines only fast idle to warm up the catalytic converter and 02 sensors faster, when the cat is cold it does not function as well as when its warmed up.

User currently offlineKlaus From Germany, joined Jul 2001, 21652 posts, RR: 53
Reply 3, posted (13 years 6 months 6 days 6 hours ago) and read 866 times:

It´s not a property of the engine; There´s a special add-on mechanism for this purpose.

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