il bambino martino Posted January 16, 2009 Report Share Posted January 16, 2009 Every once in a while, regardles of whether the car is cold or warmed up, the RPM will dip for just a split-second. It's easier to spot it when I'm sitting at a light, but I can swear it feels like it also happens when I'm cruising down the freeway @ 70mph (yeah I know I'm a ). When I say cruising, I don't mean in cruise control - that hasn't worked since I bought it. Link to comment Share on other sites More sharing options...
--Aaron-- Posted January 16, 2009 Report Share Posted January 16, 2009 If it's happening at idle you may want to clean your IAC, inspect your TB for build up while you're in the area, maybe clean the electrical portion of the IAC w/ some contact cleaner. You may also want to clean the element in your MAF with some MAF specific cleaner...CNC produces it I beleive....a few things to try, also you can clean the MAF plug prongs with some contact cleaner as well. Also take a look at this....securing the MAF connection. Link to comment Share on other sites More sharing options...
Distort Posted January 16, 2009 Report Share Posted January 16, 2009 Mine does that when I have the A/C on, I have read a few threads, cause may be an evaporator? Mine is like it's cycling, annoying, but not killing me to fix it. Link to comment Share on other sites More sharing options...
early_november Posted January 16, 2009 Report Share Posted January 16, 2009 Mine does that when I have the A/C on, I have read a few threads, cause may be an evaporator? Mine is like it's cycling, annoying, but not killing me to fix it.My sisters XC does that occasional drop in rpm (maybe 100-200) for a split second at stop signs. Never figured it out. Link to comment Share on other sites More sharing options...
ozzimark Posted January 16, 2009 Report Share Posted January 16, 2009 Does it feel like a hiccup/hesitation when you're cruising? I believe it's ECU related, my S70 does the same thing, I did some poking about, and apparently there is a service bulletin for the issue. I can't find it now, but if you do some searching, it'll turn up. The problem description will sound pretty familiar For the cruise control, it's possible that the rubber elbow going to the vacuum pump is broken, have a look at it ;) Link to comment Share on other sites More sharing options...
il bambino martino Posted January 16, 2009 Author Report Share Posted January 16, 2009 Does it feel like a hiccup/hesitation when you're cruising? I believe it's ECU related, my S70 does the same thing, I did some poking about, and apparently there is a service bulletin for the issue. I can't find it now, but if you do some searching, it'll turn up. The problem description will sound pretty familiar For the cruise control, it's possible that the rubber elbow going to the vacuum pump is broken, have a look at it Yup, and I was mildly freaked out when I first felt it.Thanks for the info! Link to comment Share on other sites More sharing options...
ozzimark Posted January 16, 2009 Report Share Posted January 16, 2009 If it's the same thing as my issue, don't worry about it. It's not harmful, unless it causes mental anguish knowing that your car isn't behaving. I'm sure if you take it to the dealer and describe the problem, and suggest that there is an ECU update to fix the issue, a good tech may know what you're talking about, and download the update to your ECU Link to comment Share on other sites More sharing options...
Distort Posted January 16, 2009 Report Share Posted January 16, 2009 My sisters XC does that occasional drop in rpm (maybe 100-200) for a split second at stop signs. Never figured it out.Yeah, mine does it anytime with the A/C on, never with it off. Try not using the A/C to find out if it's the problem, or have it tested, don't know how. Link to comment Share on other sites More sharing options...
flyfishing3 Posted January 16, 2009 Report Share Posted January 16, 2009 yeah, isn't there a mystery 98 hiccup on some cars. Link to comment Share on other sites More sharing options...
ozzimark Posted January 16, 2009 Report Share Posted January 16, 2009 yeah, isn't there a mystery 98 hiccup on some cars.Forgive me for posting to swedespeed, but I found what I was lookging for. http://forums.swedespeed.com/zerothread?id...p;postid=696000 Link to comment Share on other sites More sharing options...
il bambino martino Posted January 16, 2009 Author Report Share Posted January 16, 2009 Awesome!Did you ever find out how much they dealer would charge for that? Link to comment Share on other sites More sharing options...
ozzimark Posted January 16, 2009 Report Share Posted January 16, 2009 No clue, I never took mine in. I think it varies from place to place, I would imagine between $0 and 50. :P Link to comment Share on other sites More sharing options...
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