1986 BMW 535 Just Curious

1986 BMW 535
198,000 MILES • 6 CYL • 2WD • MANUAL
Avatar
AB0918
  • MEMBER
  • 1 POST
Why do most cars have fast cold idle and a select few don't? Do non-fast idle cars have to run extra rich during warm up? Why don't more cars have the slow cold idle?
May 14, 2008 at 7:54 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
MHPAUTOS
  • CAR REPAIR CONTRIBUTOR
  • 31,937 POSTS
Hi there,

This is just at the whim of the designer i feel, some cars just use a cold start injector which makes it richer (like an old choke system, others use a idle air by pass system which is more complex and costs more, some of the systems are a nightmare to get right (early Nissan) while Toyota (cold start injector) is a dram and realy give a problem. I don.t know why there are so many different systems about, but i know one thing, each company will say theirs is the best.

mark (mhpautos)
May 14, 2008 at 9:51 PM
Advertisement