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Old 01-23-2009, 09:20 AM   #1
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Problem

I have an 02 Mustang 3.8 L What will cause a hesitation when depressing the gas pedal. The tach rises and then the car takes off. I noticed the 2 cables across the top of the engine attached to the throttle. One seems to not retract as fast as the other.
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Old 01-23-2009, 09:35 AM   #2
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Re: Problem

how much of a hesitation? Mine has a slight pause when gunning it... and in the next couple months the fuel filter had gone out. I would assume other minorly small things to check would be cleaning the air filter and the MAF.
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Old 01-23-2009, 09:55 AM   #3
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Re: Problem

It could also be the Throttle Position Sensor. That what caused mine to do the same thing.
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Old 01-23-2009, 11:06 AM   #4
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Re: Problem

the cable that reacts slower is the cruse control cable, and thats normal. if you floor the throttle does it do it worse?
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Old 01-23-2009, 11:32 AM   #5
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Re: Problem

the cables crossing is also normal. I would clean the maf and IAC (idle bypass sensor) or replace it.
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Old 01-25-2009, 07:53 AM   #6
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Re: Problem

there is about a 3 second hesitation. I have replaced fuel filter, plugs, wires. Air filter is clean. The car stalls when i accelerate quickly like entering the freeway and trying to get the car up to highway speed quickly.
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Old 01-25-2009, 08:00 AM   #7
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Re: Problem

Quote:
Originally Posted by cntry_maverick View Post
there is about a 3 second hesitation. I have replaced fuel filter, plugs, wires. Air filter is clean. The car stalls when i accelerate quickly like entering the freeway and trying to get the car up to highway speed quickly.
jesus christ.... yeah, 3 seconds is huge

Does it take off like normal after this Biblical pause? Does it run as strong as always up to the higher RPM's?
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Old 01-25-2009, 09:20 AM   #8
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Re: Problem

Is this an automatic, it could be the torque converter.
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Old 01-25-2009, 12:37 PM   #9
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Re: Problem

5 things jump to mind....
Trans
MAF
HUGE intake leak
plugged cats
Fuel Pressure
It could also be none of the above, but that's where I would start at work, if visual inspection went okay, and computer returned no helpful codes

Any chance you have a check engine light?


1) as bbunt said.. could be trans - Especially if your RPMs go up before the car will start moving... but I don't see how this would stall the car when you hit the gas.. maybe when you come up to a stop (if lockup clutch is stuck, car would jerk/stall as you come to a stop as trans is locked to motor)

2)
Disconnected or completely dead MAF would act a lot in the same way... and with automatics the engine might not measure the correct amount of load, and cause issues with the transmission (same reason crown vics never shift out of first and will rev to the moon when their fuel pumps fail and they run out of fuel top end..) - that would be where I would start...

3) That or you've got a vacuum leak of epic proportions behind the mass airflow, but your 02 sensors would peg either rich or lean and show

4) Air in, no air out = huge exhaust restriction could act a lot in the same way as a dead MAF - your car would be getting a lot more air and fuel than it could move out.. aside from downstream 02 monitors, best way to check this is use a laser temp gauge, if cat is a LOT hotter on the inlet side than the outlet side when the car is at normal operating temp, then your cat is probably plugged

5) Lack of fuel... see crown vic note in possibility 2.. couldn't hurt to check your fuel pressure, esp as you start to load up the engine, it might be fine at idle but dry up/drop pressure fast as you accelerate
___
Without actually seeing the vehicle, those are the possibilities that I would consider first off - and if you have a check engine light.. get the codes read, it could point you directly to the issue


Good luck...
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Old 01-27-2009, 07:27 PM   #10
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Re: Problem

Thanks. I replaced the MAF and it seems to have corrected the problem.
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Old 01-27-2009, 07:41 PM   #11
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Re: Problem

If it continues...

Are you throwing any check engine codes?
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Old 01-27-2009, 10:03 PM   #12
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Re: Problem

Hope we were able to help some
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