Over the labor day weekend, I was making a 4-hour drive and noticed that my speedometer started flying all over the place. Around hour 4, it started staying at 0 mph, no matter how fast or slow I was driving. I knew it would have to be repaired/replaced, and thought nothing of it. On the way back (another 4-hour drive), I noticed that my transmission started slipping. Staying at 80mph, it would shift up, then down, then back up. It did this, very annoyingly, about every 30 seconds for the entire 4 hour drive. I also noticed it would shift especially hard when the speedometer would fall to 0mph and then jump back up to 80mph. I brought it in to have it looked at, and they couldn't reproduce the slipping, and could not find anything wrong the the transmission. They told me the speedometer would need to be replaced, but did not specify exactly which part (it was only a free diagnostic). Can anyone give me any clues as to what exactly could be the problem?
2007-09-07 09:54:21 · 4 answers · asked by Mike 2 in Cars & Transportation ➔ Car Makes ➔ Honda
Your car uses a vehicle speed sensor as an input to the on-board computer that controls the fuel injection and transmission systems. Whenever you lose a signal from that sensor the microcomputer switches to pre-programmed values to use in determining the right fuel mixture. For the transmission, the critical speed is about 40 mph when a device called a torque converter clutch engages or disengages.
The vehicle speed sensor is also the input for the operation of the speedometer. What I think is happening is that with a rise in temperature the vehicle speed sensor starts breaking contact in the signal circuit and causes an erratic signal or a total loss of the signal to the on-board electronic control module and to the speedometer. The first reaction of that control module is to switch to the pre-programmed values which cause some change in the engine performance. The second thing is that the transmission control portion doesn't know what the speed of the car is so it cuts the torque convertor clutch out. then, when the signal is reaquired the torque converter clutch kicks back in because the vehicle speed is over 40 mph. The continual apply/unapply of the torque converter clutch will feel like someone keeps running into your back bumper or it will feel as though you are losing then gaining power. The speedometer gauge is simply reflecting what the signal from the vehicle speed sensor is and as such, the speedometer itself should not be the problem.
My bet is that if you change the vehicle speed sensor you'll solve your problem. By the way, the sensor is a magnetic pick up and you don't have a plastic drive gear in the trans that a car with a conventional speedometer cable would have.
hope that helps answer your question
2007-09-07 11:10:23 · answer #1 · answered by honda guy 7 · 1⤊ 0⤋
it could be the speedometer gear in the trans.,follow the speedo cable to where it gos into the the trans.,remove the retainer clip and pull out the cable,look at the little plastic gear,is the teeth chewed up if so you can buy a replacement at your dealer and you should also change the trans filter and oil
2007-09-07 10:17:04 · answer #2 · answered by easy 4 · 0⤊ 0⤋
right this is a pair of issues to remember. Your trans. could desire to be overheating. while your trans. does this, it starts performing unevenly, such as you have descibed. a pair of issues possibly to examine out, are the cooling strains, and your trans. fluid filter out and fluid. If the fluid is burned and not clean it could have very undesirable consequences over the years. prevalent fluid and filter out alterations are continuously a plus for any transmission. i think of from what curiously such as you may desire to flow with an entire trans. provider in case you havent broken it previous restore yet.
2016-10-18 06:21:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Time to ship it off to the old bone yard.
2007-09-07 10:01:52 · answer #4 · answered by Anonymous · 0⤊ 0⤋