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Old 06-05-2013, 12:37   #1 (permalink)
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2002 Sable transmission shifting at high speed

Hi,

My 2002 sable is acting oddly. When cruising at highway speeds, 65-75 mph, and needing to push the gas pedal more, to pass or go up a hill, the transmission seems to slip. Not slip exactly. But it will shift from 4th down to 3rd, and the rpm's rise, as expected when you try to accelerate. But then in the midst of accelerating, or maintaining speed uphill, the transmission will shift back into 4th gear, hesitate, and shift back to 3rd gear, then to 4th, then to 3rd. This goes back and forth until you let up on the accelerator. This does not seem like a natural shift point at all, and the car shudders when it happens. The car is driveable around town, and on the highway it works as long as you're content never passing anyone or maintaining speed uphill.

What do you think is going on and how can I fix it. Oh, transmission fluid looks good, level and color are fine.
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Old 06-05-2013, 13:59   #2 (permalink)
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Re: 2002 Sable transmission shifting at high speed

Try replacing the fuel filter to see if it helps.
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Old 06-05-2013, 18:58   #3 (permalink)
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Re: 2002 Sable transmission shifting at high speed

That's a simple experiment. I'll probably try that.

Some extra info: trouble code P0191 - Fuel Rail Pressure Sensor Circuit Range/Performance was found with my scan tool, though no check engine light is on while running, odd?

Maybe this makes sense. I'm having problems during times of high fuel demand. Maybe something is bad in the fuel system causing lower pressure. Maybe the fuel filter does need to be changed. I guess fuel pump could be bad too. Here is a list of possibilities from another website:

- High fuel pressure
- Low fuel pressure
- Damaged FRP sensor
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Vacuum leaks
- Fuel

What do you think would be easiest to start checking first? Any other thoughts? Thank you in advance.
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Old 06-05-2013, 20:20   #4 (permalink)
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Re: 2002 Sable transmission shifting at high speed

I'd start with the fuel filter and see how plugged it is. There can be numerous codes without the light on.
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