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Discussion Starter #1
The engine hesitates when accelerating from a stop (or from a very low speed). This condition exists always, but is more pronounced when the engine is cold. Feathering the pedal helps some.

The engine starts easily and runs very smoothly otherwise, and no trouble codes are evident.

Is there a chance that the TPS has a dead spot just above idle? What else might cause this symptom?

I hesitate the throw parts at it unless I'm reasonably sure of the origin of the problem.

Regards... Mike
 

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Discussion Starter #3
No, it isn't that, as I've replaced the filter a couple of times since I've owned the car (I got it a couple of years ago). The hesitation gremlin has been there all along.

Mike
 

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Discussion Starter #5
Hmm. Mom's 97 escort had the same problem. Turned out to be the spark plugs. Replaced em and it fixed the rough idle and the hesitation issue.
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Yup, I did that too. I didn't replace the wires; however, they were within specs when tested with an ohmmeter.

Also, the ignition timing is dead on.

Mike
 

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Discussion Starter #7
Hey, I found it. It was indeed the TPS. I installed a borrowed known good TPS and the problem disappeared.

It must have one or more failed segments just above the area of idle.

Mike
 

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Hey, I found it. It was indeed the TPS. I installed a borrowed known good TPS and the problem disappeared.

It must have one or more failed segments just above the area of idle.

Mike
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my 93 with a vulcan does that same hesitation. i just need to figure whether it's worth the 45 bucks or so to get a new tps.

EDIT: i actually looked it up, it is like 14 bucks from rock auto, so i might go ahead and order one to see if that fixes it.

does anybody know if it's the same on a 93 GL as the one on a 97 GL? if it is i could try the one off my dad's.
 

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Discussion Starter #10
Update:

It wasn't my TPS after all... the problem was still there. Subsequent resistance tests of both TPS units I had proved no fault. Why it seemed to work for a short time, I don't know; perhaps it was because I wanted it to work so badly or maybe I just dreamed it.

I just lived with it until now.

I was suspecting one or both bad O2 sensors but hesitated to replace them without conclusive evidence that they were faulty. Besides, they were relatively new.

One finally triggered a DTC, which followed that sensor when I swapped them side to side.

I replaced both sensors.

The hesitation condition all but disappeared, and my fuel economy, while still horrible, has been steadily improving since the repair a few weeks ago (I reset the ECM in the belief that it would speed up the learning curve).

I was burning coolant until Sept 2007; perhaps the new sensor on the bank with the bad gasket crudded up from that and wasn't working according to plan.

Regards... Mike

PS... I note no difference in performance/responsiveness which surprises me a little given the evident improvement in fuel economy.
 

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Whats a TPS.. and where is the fuel filter located on the Taurus? I may need to replace both. Also how does one go about cleaning the MAF sensor? Just with carb cleaner or what?
 

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The TPS is the throttle position sensor. It's located on the throttle body to determine how much the butterfly valve is opened (how much you're pressing on the gas pedal).

Fuel filter is located fore of the right rear passenger side wheel. You don't need to jack up the car to get to it although it helps.

Cleaning the MAF sensor requires using special MAF sensor spray. You can remove the MAF sensor from the MAF housing or just remove the airbox lid and shoot it without removing.
http://www.taurusclub.com/forum/index.php?showtopic=64155
 
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