Question about 1997 Ford Thunderbird LX

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97 thunderbird hesitates on hard acceleration

97 thunderbird with a 4.6 L hesitates on hard acceleration. If you bring it up easy, no problem. Haven't ran code checks but i have checked the tps sensor and maf sensor, both within specs. Also i'm not getting any voltage on the electric fan. Book says there's a fuse link next to the start relay, can't find.

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  • kemmy1 Dec 14, 2008

    emissionwiz, hzyoears: changed fuel filter and replaced bad fuel line, car still hesitated and would not rev up, unplugged maf sensor and all works fine. My guess is to replace maf sensor. Solved fan problem. Can you help me with choosing a decent code checker, I would like it to be able to multiple vehicles if possible, ie. chevy and ford gas and deisel.

  • yadayada
    yadayada May 11, 2010

    You have checked the MAF under a load?

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Replace fuel filter

Posted on Dec 10, 2008

  • hzyoears Dec 10, 2008

    I think those cars have coil packs so check and see if there is an engine misfire code and whatever number is stated that is what cylinder.

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U hit on the nail on the head, if the car runs fine with the MAF disconnected it is the MAF, but try cleaning it first, dirt gets on the little heated wire of the sensor and screws up the signal, sometimes cleaning it with MAF spray cleaner takes care of the issue, the MAF is expensive, the spray cleaner made by CRC is available at most parts stores now. By the way the way u checked the MAF is how I did it in the dealer.

Posted on Dec 14, 2008

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How exactly Vehicles Accelerator Pump Diaphragm Works?

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What would cause my 97 thunderbird to hesitate when accelerating?


this list gos from most to least likely 1 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
2 Inspect Mass Air Flow Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
3 Inspect Choke Thermostat Stuck or Improperly Functioning Choke Thermostat.
4 Inspect Air Cleaner Tempature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
5 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
6 Inspect PCV Valve Plugged or Damaged PCV Valve.
7 Inspect Carburetor Worn, Faulty or Damaged Carburetor.
8 Inspect Fuel Injector Dirty or Worn Fuel Injectors.
9 Inspect Hose (PCV)at Clogged or Collapsed PCV Hoses.
10 Inspect Fuel Pump Faulty Fuel Pump.
11 Inspect Fuel Pump Low Fuel Pressure.

this is a long list i know but this is every thing that would cause this but it go's from most to least hope this helps

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if it is hesitating and stalling like that. if its a manual then the clutch is going out if its a automatic then the transmission is slipping. also check the dist. cap again maybe it is the firing order its a common mistake

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