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97 Taurus idle and acceleration hesitation

Tiny
WESTARV
  • MEMBER
  • 1997 FORD TAURUS
1997 Ford Taurus 3.0 6cyl 175k miles has hesitation/rough idle and hesitation during acceleration. Somewhat intermittent. When at idle the roughness often occurs only when ac is on. Engine never dies but comes close at idle.

Engine may hesitate during mild acceleration, but seems to stop at higher rpms as when hitting passing gear.

I have replace plugs/wires, IAC, and fuel filter. The fuel filter was replaced by a Fast Lube and I dont think I had noticed this problem as severe or as frequent before it was replaced, but not sure.

Thanks for any help.

wesley
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Thursday, August 23rd, 2007 AT 10:10 PM

6 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Is the roughness like an engine miss or a vibration? Might want to check the motor mounts if it is a vibration. Did the Fast Lube also do the tune up?
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Friday, August 24th, 2007 AT 8:14 AM
Tiny
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The roughness is definitly like a misfiring. Almost as if a plug wire was unplugged. I changed the plugs and wires a few weeks after the fast lube did the tune up.

I have noticed that early in the morning or very late, when it is cooler, it seems not to do it nearly as much or at all. I was wondering if o2 sensor, mass air flow, or coil cap? May cause symptoms like this. Any ideas?

Thanks for your help

wesley
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Saturday, August 25th, 2007 AT 8:07 AM
Tiny
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The roughness is definitly like a misfiring. Almost as if a plug wire was unplugged. I changed the plugs and wires a few weeks after the fast lube did the tune up.

I have noticed that early in the morning or very late, when it is cooler, it seems not to do it nearly as much or at all. I was wondering if o2 sensor, mass air flow, or coil cap? May cause symptoms like this. Any ideas?

Also, when car is in park or neutral it does not miss. As soon as you put it in drive, rpms drop a little and it begins to miss. Seems like turning on AC or putting any torque on engine causes it to miss.

Thanks for your help

wesley[/quote:1326eeb1c9]
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Saturday, August 25th, 2007 AT 7:49 PM
Tiny
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Sounds like ignition if it begins to miss under any load. What kind of plugs and wires did you use? Could be an ignition coil going out or a weak injector as well. Does it idle real low? Check Engine Light on?
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Sunday, August 26th, 2007 AT 7:51 AM
Tiny
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Thanks very much ! Im glad I checked the plug wires again before I rebuilt the engine. I found a plug wire not adequately connected.

Problem solved !

Wesley
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Sunday, August 26th, 2007 AT 11:01 AM
Tiny
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Glad to hear it was something simple
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Monday, August 27th, 2007 AT 7:58 AM

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