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1986 BMW 535 Just Curious

Tiny
AB0918
  • MEMBER
  • 1986 BMW 535
  • 6 CYL
  • 2WD
  • MANUAL
  • 198,000 MILES
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?
Wednesday, May 14th, 2008 AT 7:54 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 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)
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Wednesday, May 14th, 2008 AT 9:51 PM

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