DAVID B. From United States of America, joined Jun 2001, 3148 posts, RR: 5 Posted (11 years 8 months 1 week 2 days ago) and read 625 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?