I think I have cured the engine stumbling i used to experience at higher elevations. I never had the problem at lower elevations. I most recently experienced the problem in december on a trip to the eastern sierra, where the elevation of the main highway (395) ranges from about 5,000 feet to 9,000 feet. The problem was at its worst during a fairly heavy snow storm. I also experienced the problem in january on a ski trip to the Lake Taho area, where the roadway elevation there and en-route ofter exceeds 6000 feet. based on the experience of others, I cleaned the contacts on my air flow meter and replaced the O2 sensor in an effort to correct the problem. To clean the AFM contacts, I had to pry the black plastic lid/box off of the AFM (it is glued on). Once i got the lid off, I sprayed pretty much everywhere with contact cleaner...esp. at the contacts...I also cleaned the carbon track with a Q-tip...and the contact area of the contact arm by very carefully rubbing a clean piece of heavy paper across the face of the contact until it no longer left a black mark on the paper. I again sprayed everything with contact cleaner...used low air pressure to gently clear out the excess contact cleaner...and then re-glued the plastic lid/box with silicone. I returned today from a several day trip to the eastern sierra...same places as before...it even snowed once like last time...there was no hesitation/stumbling at all... there always has been on each of my 4 prior trips to the area in the last year. The engine also seems to excelerate better. Hopefully the cure is not temporary and will last awhile... steve 1990 syncro westfalia |
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