Question about 2001 Ford Focus

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2001 Ford Focus troubles

Hi I see you are an expert with fords. Please help me with my problem.(2001 Focus\Zetec\5spd\68k) It's an intermittent problem. It bucks usually at higher speeds and heavy acceleration. Sometimes in lower gears at takeoff, but anytime I accelerate hard it happens and at the same time the speedometer jumpes up 10 20 30 mph+. It always idles fine, but as soon as I step on the gas its jerky like if I was pumping the clutch. In between jumps it usually has plenty of power and most of the time I can go pretty smooth when barely touching the accelerator. Checked out some of the basic components that might be responsible, although I am not a mechanic and don't really know what to do. The engine looks very clean and well maintained. I'm hoping it's something simple. What I've done: -Checked spark plugs, they are clean and seem okay
-Used water remover for fuel tank and injector cleaner, no change
-AdvancedAP has checked for any codes and there were 0. No lights are on the dashboard
It doesn't happen in neutral when I rev the engine, nor does it feel like there is too much throttle. It seems to be getting worse, it stalled on me a couple of times. :( Someone said it might be the throttle positioning sensor, but if I take it to a mechanic I want to make sure I will eliminate the problem without having to make multiple visits. Your help is much appreciated!

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  • 3 more comments 
  • fundango Aug 24, 2008

    The hose, is that the air intake? All the hoses seem to be in perfect shape and the clamps are tight. Advanced auto parts found absolutely no codes. The jerking only happens when driving so would the codes still show up if the car is at idle? The computer saves any codes right? Also it's weird that in neutral i can rev thru 5000rpm without any problems. Although the throttle response seems pretty sluggish unless that is how its supposed to be. (?)

    Is there any way to distinguish which one is bad the MAF or the TPS?

  • fundango Aug 24, 2008

    Someone said that the Ecu needs at least one of the two to be present. MAF and TPS When I disconnected the MAF the car wouldn't start. Wouldn't that indicate a bad TPS?

  • Zand61 Nov 19, 2008

    I have the exact same problem as Fundango mine is also a 2001 Focus i had an outer province inspection and they said they need to have this fixed before i will be able to have it regestured.. is there any way to guid them so i will not have to pay lots of money for there time to troble shoot on the problem?

  • clint snider Apr 16, 2009

    I have a 2000 2.0L DOHC VTech motor, the car idols high after i warms up. Then when you are at a stop light and let off the brake just a hair it will run off. After driving and placing the car in park it will idol guessing around 2500+ RPM's. I have had the check light on and had it checked, it said low voltage at the TSP. So in replacing the TSP i found out that the TSP on my car is for a standard trans, yet my car is a auto. So the idol going crazy and the weird TSP i dont know were to turn. IACV maybe? HELP

  • yadayada
    yadayada May 11, 2010

    Make sure the hose that goes to the engine from the air cleaner is not split or the clamps loose, any unmetered air will cause this, if you find nothing then if many be the MAF sensor or the TPS . Have you checked for trouble codes?



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I think the issue is MAF related, a MAF will not set a code most times unless the signal is lost completely, like if you disconnect it, try this, disconnect the MAF wire connector and see if the problem goes away, the PCM will go into failure mode and substitute a signal, this will of course turn on the check engine light.

Posted on Aug 24, 2008

  • yadayada
    yadayada Aug 24, 2008

    Just call me 925-459-0571 Dennis



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