SLK/R170: engine surge-"limp home" mode
09-09-2008, 10:20 PM
#1
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'97 red miata (for sale)/ '03 red slk230
engine surge-"limp home" mode
yesterday as I was arriving at work in my '03 slk230 the engine started to surge. there was no throttle response, the car would move at about 20 mph. the trouble code shows as PO638....I can't find a reference anywhere for PO638. Any ideas?? help?? thanks, Larry
09-11-2008, 12:01 AM
#2
Sounds like its lost throttle adaption.
Start car, put in drive, hold foot on brake for a couple of minutes.
See if idle settles down.
May also be connector on throttle or pots their selves.
Try cleaning the maf with maf spray as a long shot.
Seen similar faults on here. http://www.benzworld.org/forums/r170-slk-class/
Start car, put in drive, hold foot on brake for a couple of minutes.
See if idle settles down.
May also be connector on throttle or pots their selves.
Try cleaning the maf with maf spray as a long shot.
Seen similar faults on here. http://www.benzworld.org/forums/r170-slk-class/
09-11-2008, 04:09 PM
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'97 red miata (for sale)/ '03 red slk230
Bazzle--thanks for the reply--I had to drive it several blocks in this situation--the throttle does not respond at all--just goes 20 mph. I did try the MAS cleaning--no difference--BAS/EPS lights stay on, CEL stays on---code still shows PO638, and even the MB dealer has no clue as to what PO638 is??
