Last post on Jan 25, 2012 at 5:39 PM
You are in the Mazda Mazda5
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Mazda MAZDA5, Van
#4 of 6 Re: mazda5 RPM bounce between 500 and 1000 from a cold start(idle) [joe379]
Dec 22, 2011 (3:32 pm)
Not necessarily! In cold starts it usually just jumps up to between 2000-2500 rpms and stay steady for a few seconds... which is high. Cold starts should be no more then 1800 rpms and quickly settle down to just about 1000 rpms.
You could also clean out the throttle body with some throttle body cleaner sprayed on a rag and wiping the inner bore and the butterfly. Then do a iddle learn procedure.
#5 of 6 Re: mazda5 RPM bounce between 500 and 1000 from a cold start(idle) [davicho]
Jan 25, 2012 (5:37 pm)
thanks to you both for probably perfect answer to my mystery of what happened after putting in new Costco battery yesterday for our 2006 MZ5 5MT -- warm idle fluctuating erratically between 500-750 rpm, almost stalling. The above is certainly worth a try. I'm heading out to try it right after dinner.
PS -- the Mazda OEM positive battery cable end was shockingly weak, I completely ruined it overtightening trying to get a solid connection to the new battery. But a new connector, labeled "marine", costing less than $5 from O'Reilly's was an easy fit after some filing to enlarge the bolt-hole, and adding some washers.
#6 of 6 Re: mazda5 RPM bounce between 500 and 1000 from a cold start(idle) [whobodym]
Jan 25, 2012 (5:39 pm)
and the new "marine" battery cable connector is about 10 times stronger than the OEM one. I'll live with the few-ounces weight penalty sapping my gas mileage, thanks.