Register FAQ Members List Calendar Search Today's Posts Mark Forums Read   Cars Lounge > Cars Lounge > Hyundai stumble when first start driving cold User Name Remember Me? Password   Thread Tools Search this Thread Display Modes   #1   10-08-2006, 04:56 AM kjr Junior Member   Join Date: Dec 2005 Posts: 12 stumble when first start driving cold 2002 XG350L with 42,000 miles has stumble when first strarting driving. Car starts fine, revs up, idle drops down then I put it in gear to drive. Car starts to bog as if it is going to die then takes off. This is every day lately. Once warmed up runs fine. I have tried a bottle of CHevron's Techron but did not help. Any ideas HyundaiTech? kjr View Public Profile Find all posts by kjr Add kjr to Your Buddy List   #2   10-08-2006, 02:49 PM hyundaitech Junior Member   Join Date: Oct 2004 Posts: 1,438 stumble when first start driving cold Dunno. If you've got a check engine lamp, you should start there. But I'm presuming you don't. Try reinitializing the throttle: Turn the key on (don't start the car) and back off immediately and wait ten seconds. Your throttle will do a sweep. Also do an idle learn. Start the car with the a/c on and let it reach operating temperature. Let it run for 10 more minutes. Then turn the a/c off and let it run for another ten minutes. hyundaitech View Public Profile Find all posts by hyundaitech Add hyundaitech to Your Buddy List   #3   10-08-2006, 05:30 PM Matthew S. Whiting Junior Member   Join Date: Jul 2003 Posts: 977 stumble when first start driving cold hyundaitech wrote: Quote: Dunno. If you've got a check engine lamp, you should start there. But I'm presuming you don't. Try reinitializing the throttle: Turn the key on (don't start the car) and back off immediately and wait ten seconds. Your throttle will do a sweep. Is there any indication that the throttle sweep has been completed? Is there a beep or any dashboard light indication? Matt Matthew S. Whiting View Public Profile Find all posts by Matthew S. Whiting Add Matthew S. Whiting to Your Buddy List   #4   10-09-2006, 03:39 AM kjr Junior Member   Join Date: Dec 2005 Posts: 12 stumble when first start driving cold Idle learn? Never heard of that. I did try the sweep but it didn't help. With the idle learn I just leave it idling the whole time? kjr View Public Profile Find all posts by kjr Add kjr to Your Buddy List   #5   10-09-2006, 08:53 AM hyundaitech Junior Member   Join Date: Oct 2004 Posts: 1,438 stumble when first start driving cold Unfortunately, no. The only way you'd know for certain is to have someone listen or watch under the hood while you try to make it happen. hyundaitech View Public Profile Find all posts by hyundaitech Add hyundaitech to Your Buddy List   #6   10-09-2006, 08:59 AM hyundaitech Junior Member   Join Date: Oct 2004 Posts: 1,438 stumble when first start driving cold Yep, just leave it idling. It'll watch and learn where it needs to leave the throttle plate for proper idle rpm. hyundaitech View Public Profile Find all posts by hyundaitech Add hyundaitech to Your Buddy List   #7   10-10-2006, 03:48 PM kjr Junior Member   Join Date: Dec 2005 Posts: 12 stumble when first start driving cold Is it safe to clean the throttle plate with cleaner? Engine running or not? I know a lot of cars can be harmed if this is not done properly (ruin O2 sensors, remove coatings, set trouble codes, etc). Also, thanks for all the assistance on here. Your feedback and advice is invaluable! kjr View Public Profile Find all posts by kjr Add kjr to Your Buddy List   #8   10-11-2006, 04:22 PM hyundaitech Junior Member   Join Date: Oct 2004 Posts: 1,438 stumble when first start driving cold It's okay to clean the throttle plate with carb cleaner (while not running). hyundaitech View Public Profile Find all posts by hyundaitech Add hyundaitech to Your Buddy List « Previous Thread | Next Thread » Thread Tools Search this Thread Show Printable Version Email this Page Search this Thread: Advanced Search Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts vB code is On Smilies are On [IMG] code is On HTML code is Off Forum Jump Please select one User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home -------------------- Cars Lounge     General     Acura     Alfa Romeo     Audi     BMW     Dodge     Ferrari     Fiat     Ford         Ford Explorer         Ford Falcon         Ford Festiva         Ford Flathead         Ford Focus         Ford Mustang     GM         GM Cadillac         GM Cadillac Deville         GM Camaro         GM Camaro Firebird         GM Chevy Malibu         GM Corvette         GM Fiero         GM Oldsmobile         GM Pontiac     Honda     Hyundai     Infiniti     Isuzu     Jaguar     Kia     Lexus     Mercedes Benz     Mini     Mitsubishi     Nissan     Peugeot     Porsche         Porsche 911         Porsche 928         Porsche 944     Rolls Royce     Saab     Subaru     Toyota         Toyota Camry         Toyota MR2         Toyota Prius     Volkswagen         Volkswagen Beetle     Volvo All times are GMT -8. 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