david b.
Topic Author
Posts: 2894
Joined: Fri Jun 15, 2001 7:18 pm

Question For Mechanics

Tue Nov 26, 2002 9:28 am

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
Posts: 2955
Joined: Mon Jun 26, 2000 5:56 am

RE: Question For Mechanics

Tue Nov 26, 2002 11:55 am

The fast idle on a diesel is not only for cold startups.
Posts: 1368
Joined: Sat Jul 24, 1999 6:10 pm

RE: Question For Mechanics

Tue Nov 26, 2002 1:59 pm

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.
Posts: 20713
Joined: Wed Jul 11, 2001 7:41 am

RE: Question For Mechanics

Wed Nov 27, 2002 5:37 am

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

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