Changing the ATF once
seems to have cured the problem, but my fluid change didn't go quite as planned.
I'm a "by the book" guy. If there is a book I will try to follow it. If not, I'll write one to follow the next time.
According the 2008 Owners Manual AND 2007-09 Service Manual, the 5 speed AT
supposedly uses 2.6 qt (2qt-19.2oz)/spill & fill so 3 qts
should be enough for one change and 6 quarts
should be enough for 2 changes.
But it isn't! Both manuals have the wrong specifications for refill.(see photos). If you are going to do 2 changes, get 7 qts ATF, if 3 changes get 10 qts (and work carefully.)
I used a measuring cup to add the "last" expected partial quart. Then I added another 4 oz, and another 4 oz, and another, until I'd used 3 full quarts. The fluid still wasn't on the stick! I did this twice more, about 3.25 quarts. By the time I was done measuring the last fluid addition the engine was cold. The fluid level was just barely into the hatched area. The 3.3qt estimate is what I will use from now on.
I work slower than a pro mechanic and on the ground. I couldn't get the drain plug out with my 3/8 ratchet There wasn't enough room to apply leverage. Because the plug was so tight I had to jack the car up to crack it loose. Then I had to use my torque wrench which has a ratchet instead of my breaker bar which doesn't. It took 65 lbf-ft to get the AT plug loose. (36lbf-ft is the torque spec for installation. )
I had to lower the car to level it to drain, raise it to torque the drain plug with new crush washer, and lower it again to fill., then I noted the same thing doing the rear differential. (It took more than 80 lbf-ft to break those plugs free.)
All the previous maintenance was done by the Honda dealership that sold the car to its previous (first) owner. I will never again trust a mechanic who says he can torque these crush washer fittings by feel or believe he used a new crush washer. The ones I removed were galled and scored on both faces. That shouldn't happen with 35-36 lbf-ft of torque. I did all the oil and fluid changes of my previous Element. None of those removed washers looked as bad as these did.
I warmed it up the car by driving it slowly and then letting it idle with the headlights on high beam until the fan kicked in. I shut down the engine, and within the 60-90 second interval, checked the fluid level. It was right in the checked area.
My 12-year old used E's fluid was very dark with uncertain history. I notice some improvement in low speed shifting after one change and 10 miles driving. After driving it for a few days, I've decided to do a 2nd change, and have the supplies on hand to do a third one next spring or summer. (The way that COVID is playing out I doubt that I'll drive 2000 miles before then.)
For those considering multiple changes, if depends on the condition of your fluid whether it is necessary, but here are the numbers:
Total Used qt old after % old after % changed
1 change 3.3qt 3.9qt 54.2% 45.8%
2 changes 6.6qt 1.755qt* ~25% 75.2% *(.458*3.9)
3 changes 9.9qt 0.81qt* ~11.2% 88.8% *(.458*1.76)