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Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007 Forum for discussion of the Ford Taurus, Mercury Sable and Ford Taurus SHO. Covers vehicle years: 1986-2007

 
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post #1 of 3 (permalink) Old 11-05-10, 10:06 PM Thread Starter
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Speed Bumps on Cruise Control

Hey everyone, first off thank you for reading this message. When I'm flying down the highway, I generally always put on the cruise control and notice every now and then, the RPMs will bump up a notch then down, like the car can't decide if it needs an extra boost or not for a split second. It seems to happen at semi level road or going up very small inclines. Is there a sensor or speed control device i can replace to fix it? Or is this an early warning that the tranny might be going out? Its rather annoying and the mechanics i've talked to have no clue what could be causing it.

Thanks!

2005 Ford Taurus SE, Vulcan V6

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post #2 of 3 (permalink) Old 11-05-10, 10:23 PM
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Re: Speed Bumps on Cruise Control

Hi, here is one possibility. As you are going down the road at highway speeds, your vehicle will be in overdrive; When you hit a slight down grade, the cruise control will let off of the throttle. When you let off of the throttle, with or without your cruise control on, your torque converter will release/un-lock, and your RPMs will slightly increase as you get back into the throttle or maintain it. The torque converter will lock up again and reduce your RPM as you resume your speed. This is normal.

BOB
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post #3 of 3 (permalink) Old 11-24-10, 09:40 PM
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Re: Speed Bumps on Cruise Control

You can ask your shop about replacing the TPS and/or IAC (throttle position sensor or idle air controller). Generally when one goes the other one will go at some point after. Both run about $40, but dealers charge at least twice that, so shop carefully if you want to try that. Both sensors are located above the intake manifold.

Remember speed costs money.

'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
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