Vibration in My '96 Geo Tracker

Discussion in 'Technical' started by Pimpmobile Caddy, Oct 23, 2006.

  1. I have a '96 Geo Tracker with 110K miles on it. It was running pretty well until I had to get the water pump replaced.

    Well, now I have a new water pump, but there's a new problem now; my car don't run so smoothly. It vibrates pretty badly, both with and without the gas pedal pushed. Also, because of the vibration, can't climb into high RPMs real well, so now it drives slowly. Another thing is that if driven hard, smoke blows out the engine.

    Does anybody have any idea what could be causing this problem? Any help or hints would be appreciated.
  2. This is one of those things that could be anything, and should probably be checked by a certified mechanic because they can actually see the car, but..

    First signs I would look at are:
    Head gasket?
    Something might have been #$%#ed when (or the reason why) you got the water pump replaced.
    Check your coolant reservoir for signs of oil (oil will mix with the coolant if you have blown a head gasket).. and conversely check your oil for signs of coolant (after letting the car sit for a while, and if you're doing an oil change is a good time to check)
    The "smoke blows out of engine" thing would also indicate head gasket.
    It seems like an easy fix, but its really not. It can be time consuming, and you should probably take it to a certified technician.

    Second thing I would check is ignition system:
    Note that if you are having problems with this, it is actually dangerous to be driving, as you're sending unburnt fuel through the exhaust system which could cause a fire.
    "Vibration" and hesitation is also caused by bad spark plugs (check them each; make sure the gap is still good, and make sure they aren't too fouled up). If the plugs are fine, move onto the wires. Test the wires by pulling them one at a time, if you get no effect when you pull a wire then its a problem with that wire. If replacing the wires has no effect, that vehicle 99% has electronic ignition, so you'll probably have a couple of coil packs where the wires plug into (I'm assuming this is a 4 cyl.). Change the coil pack that had the (supposedly) bad wire going to it. If not that, then you probably have ignition module problems.
  3. Thanks.

    I'm guessing it is a head gasket, since I remember a similiar problem in my dad's Isuzu Trooper, which we once previously owned.

    Here's the thing though. If the guy fixing the car happenned to do something wrong that gave me that problem, what kind of #$%#-up could happen along the way replacing a water pump that gives me this problem?
  4. I don't know where the water pump is on that, I mean its doubtful that anything was disturbed, but there is always that possibility on a 10 year old vehicle.

    Please don't call them up and yell at them because some nerd on a messageboard wrote that it could be a remote possibility. <A BORDER="0" HREF=""><IMG BORDER="0" SRC="pitlane/emoticons/disappointed.gif"></A>
  5. Though any tech worth his wit would do a combustion leak test if a vehicle comes in with an overheating/coolant leak issue. The leak test would immediately spot a blow head gasket.
  6. Like run it cold with the rad cap off to see if there are gases getting into the coolant?
    Yah, but its easier for him to pop the cap off and check for oil.
    Am I worth my wit as a non-tech?

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