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Mk1 zetec-se 1.6 acceleration waving


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Hi, i have a mk1 focus with the 1.6 zetec-se gas engine and i've stumbled across an issue with the acceleration - while reving between 2000 to 3000 rpm the engine won't hold the rpm, it will reach it then slowly drop even though i'm holding the gas pedal ( talking about stationary reving ). While driving, let's say in 3rd gear, doing the exact same circumstances will result in a forth and back waving of the car, like it's accelerating for a moment then it drops and it does this progressively worse. This does not happen if not in the 2000-3000 rpm range.

I have checked the throttle valve and it's not muddy. Anyone else have encountered this issue? Could be a sensor? Could be the fuel pump? What would you suggest, thank you!

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9 hours ago, BogdanBogdan said:

Hi, i have a mk1 focus with the 1.6 zetec-se gas engine and i've stumbled across an issue with the acceleration - while reving between 2000 to 3000 rpm the engine won't hold the rpm, it will reach it then slowly drop even though i'm holding the gas pedal ( talking about stationary reving ). While driving, let's say in 3rd gear, doing the exact same circumstances will result in a forth and back waving of the car, like it's accelerating for a moment then it drops and it does this progressively worse. This does not happen if not in the 2000-3000 rpm range.

I have checked the throttle valve and it's not muddy. Anyone else have encountered this issue? Could be a sensor? Could be the fuel pump? What would you suggest, thank you!

Changing the air filter if dirty might make an improvement πŸ‘

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On 2/14/2021 at 1:38 PM, BogdanBogdan said:

I have changed that recently too ( like 4 months ago )

Have you looked for trouble codes using Ford specific software?

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1 hour ago, BogdanBogdan said:

I'm not quite sure what you're referring to and where could I use that

Using your OBD port to access your car’s computer.Go to TunnelRat Electronics and have a read.Shows you what you can doπŸ‘

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