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Old 12-03-2007, 04:20 PM   #1
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Question Want to try some remote diagnostics??

Hi there!

Having some issues with my 2000 Sahara I6 5speed and was wondering if you guys have any ideas what it could be so that I don't get totally screwed over when I bring it to the shop (since I don't have much technical understanding)

For one the engine seems to have some misfires at highway speeds - there is no bang associated with it, it just feels like it has hickups. When I drive around in town everything is fine, idle is smooth, it starts up right away etc. but when cruising on the freeway it has infrequent hickups (for the lack of a better word...) Now the check engine light came on, too.

The other thing is that when driving at very low speeds (literally crawling, right before coming to a stop) it feels as if one of the tires has a flat spot from braking/skidding. It's kind of a limping sound, pretty faint, though - but I can feel it in the brake pedal. I don't think it's the brakes, though, because it continues when I release.

As far as the second thing is concerned, when I just called the shop to make an appointment the guy mentioned it might be a broken axle or something. That seems a bit far fetched since it is driving well otherwise and I have had the symptom for some time.

Does anybody have any ideas what this could be just so that I am a little more informed when I bring it in?? It's not that I totally mistrust the garage, but it's nice to have a little better idea, too.

I know it's a shot in the dark, but maybe somebody has a good guess?

Thanks!

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Old 12-03-2007, 05:24 PM   #2
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Sounds like your miss could be plug boots breaking down, a sensor loading up, or a cracked/fouled plug.

If you had a broken axle shaft on a c-clip style rear end you would know it. The axle would fall out. I would lean toward you having a bent axle shaft, tweaked axle tube, bad axle bearings, something loose or damaged in your carrier, or something warped or out of place in the rear brake system.

It is hard to web diagnose anything on a vehicle, These are just a few ideas and I hope it helps you out.

Odhinn

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Old 12-04-2007, 08:05 AM   #3
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Quote:
Originally Posted by Odhinn View Post
Sounds like your miss could be plug boots breaking down, a sensor loading up, or a cracked/fouled plug.

If you had a broken axle shaft on a c-clip style rear end you would know it. The axle would fall out. I would lean toward you having a bent axle shaft, tweaked axle tube, bad axle bearings, something loose or damaged in your carrier, or something warped or out of place in the rear brake system.

It is hard to web diagnose anything on a vehicle, These are just a few ideas and I hope it helps you out.

Odhinn
It does. Thanks for your comments!
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Old 12-04-2007, 10:24 AM   #4
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Start simple. It is usually less costly that way.

How long since a tune-up? New rotor,cap,plugs,wires and maybe run seafoam through your throttle body.

First thing I would check on your tires is balancing and alignment.
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Old 12-07-2007, 05:38 AM   #5
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Resolution

Just in case somebody is interested:

The thumping noise actually did come from the tires, they are cupped (which is strange because I keep them a bit overinflated, must have happened with the previous owner ).

The engine problems were caused by a faulty Throttle Position Sensor.
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