1986 BMW 535 Just Curious

1986 BMW 535
198,000 MILES • 6 CYL • 2WD • MANUAL
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AB0918
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  • 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
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
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
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