Corrosion can form between the male pin and female contacts, or the female contacts lose spring pressure on the male pin. The speedo female-side contacts are usually the culprit. With the speedo to your right, you will notice a plastic arm with a printed circuit run that plugs into the speedo input connector. Remove the module back cover being very careful to not damage the gasket. Remove all the perimeter phillips screws. Remove the entire module from the bike and lay it on a towel, face down on your work bench. Intermittent speedos are usually caused by a fault in the internal connector to the speedo subassembly. New modules are identifiable by two small Gore-Tex vents on their undersides.Īssuming you’ve got the older type and can’t get it replaced for free, try the following: Nothing really fixed the problem until Iron Horse in Tucson replaced the entire instrument module under warranty. One more thing: mechanical speedometer gears are not likely to help you since the 2007 335i coupe doesn't use a mechanical odometer, and quite likely, your wife's Honda Accord doesn't either, unless it's an EXTREMELY old model (pre-1990).Dan Eggert asked what can be done to fix Motometer speedometers on Ks:ĭan, I had numerous (I think 4 or 5) speedometer failures soon after I purchased my K75S new in ’87. But do you really think the IRS is going to come after you if your vehicle odometer is off by 11.2 miles out of every 100 traveled? I'm inclined to think that the IRS has far larger fish to fry than worrying about ONE odometer (yours) being off by 11.2 percent.Įither that, or you really are that obsessive-compulsive that this is keeping you up at night. You mention that you have to keep track of your mileage for business purposes, and that's understandable.
Wouldn't that mean our cars would have to be SWISS to be imported, and wouldn't the inside of an odometer look more like the guts of a Rolex watch than a circuit board?
That and every car sold with these diamond precision odometers would have to be sold for 10 times what they sell for now just to pay that sort of microscopic precision. If it were, we'd have aerospace quality sensors that would measure distance in INCHES, not MILES. A fraction of a mile here, a couple more fractions of a mile here.īMW never intended the vehicle odometer to be a scientific-precision instrument. While we're shaving copper off pennies and splitting hairs, did you account for any mileage deducted while backing up, parking, stopping for gas, trips to restaurants, as well as compensating for the earth's rotational speed while slowing for a traffic light or a stop sign, etc? I'm more inclined to take your word for the mile marker distances than I am for your GPS accuracy, without the need to buy a 10-mile long tape measure. Accurate enough to shave the hairs off a tick - or in this case, overcome a 11.2 percent speedometer error? Not likely. If you disagree, I'd love to watch someone hit the exact geometric center of a 65 foot wide target from a distance of 12,500 miles with only a glass scope, a rifle, and 20/20 vision.Īccurate enough for 99.99 percent of consumers to find their location? OMG yes. 65 feet out of 12,550 miles is still a remarkable amount of accuracy, but it's by no means a perfect system. The average accuracy for GPS is within 65 feet of your true position, but if you can PROVE yours is significantly more accurate than that from a distance of 12,550 miles (the current altitude of GPS satellites) - watching you prove it should be a very entertaining exercise. Do a search on "GPS errors" and you will find a surprising amount of "fudging" for GPS accuracy to make it a surprisingly questionable instrument for accurate numbers. Especially when I am seeing words like "about," "almost," "averaged," "i can account for 'a lot' of this mileage," etc.įirst of all, not to discredit or cast doubt on any of your findings, but there's enough of a "fudge" factor for GPS to toss out the GPS numbers entirely. I'm not doubting you, but I have to wonder why people are being so obsessive about this? I also see several instances where you want to be "scientific" but at the same time, you're choosing "fudge" words. Not to cast doubt on your findings, but how "scientific" is this?