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Old 09-10-2012, 12:55 PM   #1
nicksab
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Exclamation Ztec hesitating while accelerating

Hey everyone,

I qam having issue with my 2000 zx3 focus ZTec. While driving and accelerating , the car would sometimes hesitate. It feels like the engine is dying then it is back on power again.

Some other time, if I keep full throttle when the car is hesitating, the car would run but not much power and the CEL would start blinking but it does not stays on.

The coil pack is brand new, plugs too. New coilpack pigtail as well. The PCV hose is brand new too.

What could be the problem?

Visually, the only thing noticeable is coolant on the clutch housing probably coming from the hose underneath the thermostat housing.

Please any suggestions is more than welcome. This hestating problems is getting really annoying specially when starting from light or stop sign.


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Old 09-10-2012, 01:12 PM   #2
CotyM
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Has the fuel pump ever been replaced? If not that's probably the problem...

If so have you replaced the fuel filter? Any vacume leaks? Also if the the throtal position sensor is going bad it will do this, but the CEL would always be on with a P0122 code...

EDIT: Also make sure you MAS sensor is pluged in (on the airbox line thing)
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Old 09-11-2012, 11:51 AM   #3
nicksab
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Quote:
Originally Posted by CotyM View Post
Has the fuel pump ever been replaced? If not that's probably the problem...

If so have you replaced the fuel filter? Any vacume leaks? Also if the the throtal position sensor is going bad it will do this, but the CEL would always be on with a P0122 code...

EDIT: Also make sure you MAS sensor is pluged in (on the airbox line thing)
The fuel pump has never been replaced as far as i know.

The TPS was changed last year and the MAS is plugged in.

I doubt it is coming from the fuel pump because when accelerating, the car is not loosing speed or rpm. it just won t gain any rpm either. It is like the engine wants to rev up but somethng is keeping it from doing it. then it does rev up .

The problem onl exist under load too. Engine runs fine in neutral

What should i be looking into before rulling the fuel pump?

Thank you
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