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In Reply to: How does your car run when cold? posted by Todd Kenyon on December 28, 2001 at 16:19:15:
It's been in the mid 30s the past few weeks in seattle and i have no pinging, hestitation, or other issues with my M5. It sits all night uncovered and starts right up, and runs great. It cold-idles at like 11 or 1200 rpm or so, and it stays up there for about a minute of driving. it starts to come down over the course of the next few minutes.
One thing i have noticed is that i'f im holding constant load and rpm, there's definitely a discrete "snap" when the engine just finishes warming up. It's very noticeable. I.e. there's a sudden 100rpm change, even though road and throttle remain constant. It's like the idle control system (do our S38s have a cold injector like the M30 does ?) shuts the last little percentage of cold-start enrichment off but its too large a granularity to not be detectable. I get a kick out of it when it happens :)
Quick survey - does anyone else's car drive poorly when stone cold (in other words, engine at ambient temp, not run for at least 4 hours)- do you experience any hesitation in the 2500-4000 rpm range, or surging, or backfire? As many of you know, mine has these issues but only when absolutely cold. Sheldon's also does it. Drove another M5 today that ALMOST did it.... just wondering if it is a widespread phenomenon in the S38...
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