Car does a double take when you apply gas. - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 05-20-2010 Thread Starter
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Car does a double take when you apply gas.

So I just picked up my 05 GT about 2 weeks ago. I just noticed today that car acts weird whenever i apply gas. Whenever i push the gas in from coasting, regardless of whether it is 1/8 throttle or 1/2 throttle, the car jerks twice. It not violent or anything, it just feels like weight transfer under acceleration, but it does it twice even though throttle application is smooth and steady. It is so confusing, it feels like the traction control cuts power for a half a second after i put on throttle, causing it to transfer weight twice, but i don't think thats actually happening. Anyone have any idea whats going on? The car is in great condition, only has 10,000 miles, it looks like i just rolled of the showroom floor.


'05 Mustang GT (Black)- Intake and Tune, MGW shifter, Lots of suspension goodies, Nitrous (wet injection)

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post #2 of 5 (permalink) Old 05-20-2010
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Quote:
Originally Posted by OldComeNew View Post
So I just picked up my 05 GT about 2 weeks ago. I just noticed today that car acts weird whenever i apply gas. Whenever i push the gas in from coasting, regardless of whether it is 1/8 throttle or 1/2 throttle, the car jerks twice. It not violent or anything, it just feels like weight transfer under acceleration, but it does it twice even though throttle application is smooth and steady. It is so confusing, it feels like the traction control cuts power for a half a second after i put on throttle, causing it to transfer weight twice, but i don't think thats actually happening. Anyone have any idea whats going on? The car is in great condition, only has 10,000 miles, it looks like i just rolled of the showroom floor.
sounds like the fuel pump cavitation issue, but that is usually after a while of steady cruising.

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post #3 of 5 (permalink) Old 05-20-2010 Thread Starter
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yah, it happens every time the throttle is applied, whether if it is as i let the clutch out or after coasting.

'05 Mustang GT (Black)- Intake and Tune, MGW shifter, Lots of suspension goodies, Nitrous (wet injection)

Lead suspension/chassis Engineer- Wreck Racing

"If a hammer can't fix it, it's electrical."
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post #4 of 5 (permalink) Old 05-21-2010
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Quote:
it feels like the traction control cuts power for a half a second after i put on throttle...
Have you Tried turning the traction control off to be sure that's not what's happening?

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post #5 of 5 (permalink) Old 05-21-2010
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You can also try recalibrating the gas pedal/throttle body:
- Close both doors, and turn off all accessories.
- Turn the ignition to the ON position(Dashboard lights and chime turn on. DO NOT start the engine.)
- When the chime stops, smoothly depress the gas pedal to the floor while counting to 5(1001, 1002,....).
- When the gas pedal is floored, smoothly release it while counting to 5.
- Count to 6 after the gas pedal is fully released.
- Turn the ignition to the OFF position, and count to 6.
- Repeat the above steps 2 more times.

Another thought is to disconnect the battery's negative cable for 30 minutes to wipe out any data that the ECU's adaptive learning had updated.
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