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  • avatar karjunkie 01/26/09 4:36 pm PST

    I suspect you have a bad vehicle speed (VSS) sensor. The VSS sends the info to the speedometer and does a lot of other things as well. For example, the Variable Assist Power Steering (VAPS) system uses VSS input to regulate power steering pressures for higher assist at slow speeds. The Anti-Lock Brake System uses VSS information to determine when a wheel is locked up and releases pressure to that wheel to maintain directional stability. Transmissions rely on VSS information for shift strategy. Cruise control systems rely on the VSS for knowing when to activate and deactivate the system and also to maintain a constant speed. All Electronic Engine Control (EEC) systems utilize speed sensor information in one way or another. So it is not unusual that you are experiencing engine problems as well.

Answers

  • karjunkie 01/26/09 4:36 pm PST

    I suspect you have a bad vehicle speed (VSS) sensor. The VSS sends the info to the speedometer and does a lot of other things as well. For example, the Variable Assist Power Steering (VAPS) system uses VSS input to regulate power steering pressures for higher assist at slow speeds. The Anti-Lock Brake System uses VSS information to determine when a wheel is locked up and releases pressure to that wheel to maintain directional stability. Transmissions rely on VSS information for shift strategy. Cruise control systems rely on the VSS for knowing when to activate and deactivate the system and also to maintain a constant speed. All Electronic Engine Control (EEC) systems utilize speed sensor information in one way or another. So it is not unusual that you are experiencing engine problems as well.

  • rmalloy 01/26/09 7:38 pm PST

    Per the answer from "Karjunkie", does the transmission need to be pulled in order to get to the gear inside the trans that signals this VSS sensor? We were told that needs to be done and we might as well put in a "New" transmission then...very expensive!

  • karjunkie 01/27/09 7:08 am PST

    Firstly, the gear inside the transmission is purposely made much harder than the gear on the VSS, so it should be OK. Secondly, it would be ridiculous to have to replace the transmission for such a small repair. Lastly, I doubt the tranny has to be removed. It should be accesible with the car up on a lift. Please get a second opinion. I would go to Car Talk’s Mechanics Files site at:

    http://www.cartalk.com/content/mechx/fi
    nd.html


    Enter your zip code and you will get a list of mechanics in your area that other consumers have used and highly recommend. Look for ones that specialize either in the make of your car or the type of repair you need. Call 2-3 of them and ask for a ballpark figure on the repair. I have personally used this site with great success to find good honest mechanics and can highly recommend it. Good luck!

  • rmalloy 02/22/09 1:50 pm PST

    Per the answer from "KARJUNKIE" on Jan. 27th (we haven't had any problem with
    the car cutting out again until last night and it was really bad) . If I am understanding
    you correctly, you are saying that there are "two" gears....one inside the transmission
    which is very hard and another "outside" the trans which is the VSS gear which is what you think our problem is. WHERE is the VSS gear located?? The reason we were told we might as well replace the whole transmission, is because they said that the trans would need to be pulled and taken apart to get to this sensing gear. So, hopefully the VSS gear that you are talking about is OUTSIDE the trans. Is this correct??

    Also, an answer for a '95 Mercury Villager with a similar problem said to "have the
    codes pulled and let us know what they are. Trying to guess without them is
    pretty much useless. Your vechicle may be OBD1 (don't know what that means),
    if so, codes might be able to be pulled by you" and he gave a website e-address
    to go to: http://www.troublecodes.net/Ford/ Do you think this needs to be done?

    Lastly, we went to the Car Talk's Mechanics Files site that you mentioned and only
    found two listed in our area (within 10 miles). How do mechanics repair facilities get
    on this site? Do they have to pay to get on after they are recommended by someone?
    We will call these two on Monday and see what they think the problem is and
    a ballpark figure for fixing. Thanks.

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