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Your idle air control motor or valve may be faulty. Or the throttle position sensor may be out of whack, out of range. It sounds like a high idle problem, not a problem in the gearbox. Have the engine computer scanned for any trouble codes.
Good luck.
Try checking your timing to solve the ping problem, your timing might be too far advanced. For the downshifting problem, I have this same issue on my odyssey, On the top of your efi manifold you will see 2 wires that control your throttle, One of them extends to the transmission and basically lets it know when you are pressing firmly on your gas pedal, telling it to downshift. I would adjust it so the cable has some more slack in it, therefore requiring a harder press on the pedal before downshift, and hopefully a sooner upshift. You can also slightly adjust idling problems if the van is running high while in park or drive while sitting. As for the gas vapor purge code, I would first try replacing the egr valve, its only a couple bucks and takes no more than 5 minutes.
1999-2003 Honda Odysseys have trouble with their transmissions. Google "honda odyssey transmission" and look at the wikipedia article that comes up for Honda odysseys. In about the fourth paragraph you will find out about the transmission problems. If your van is acting up, have the transmission checked out sooner vs. later. It won't get better on it's own. Have the diagnostic trouble codes retrieved from the car's computer--any code that starts with 17 as in "1740" or codes that start with zero like "0730" are transmission codes and signs of impending failure. I know because my 2002 with 165,000 miles just failed.
The owner's manual offers these tips on starting in cold weather. First, do not touch the gas pedal and crank the engine for no longer than 15 seconds. If no start, hold the gas pedal halfway down and crank for no longer than 15 seconds. If no start, hold gas pedal all the way down and crank for 15 seconds. If no start, hold gas pedal halfway down and crank for 15 seconds. During any one of the start attempts with the gas pedal part/all the way down, if the engine should start, slowly release the pedal so the engine will not race. Remember that fuel does not atomize as easily in cold weather and can be a problem.
Hi! This is not a code. Instead it is an indication that you are running the van in "overdrive off" mode.
Your van is equiped with a 5 speed automatic transmission. By running in overdrive off you are essentially running in 3rd gear, out of 5 gears. This will cause your van to run at a much higher engine speed, while not going very fast at all and consuming a lot more gas than normal.
You can deactivate this mode by:
1) start the van
2) Press the break pedal
3) Shift to 'D' (drive mode)
4) press the little button that is located on the left side of the shifter, under the shifter button.
If the light does not go out after pressing this button, you may need to take the van to your Honda dealership. Your van should still be under warranty as it is a 2007 model.
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