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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Hard/ Delayed start

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Old May 8, 2014 | 02:51 PM
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Lightbulb Hard/ Delayed start

93' 302.
It will start well ( not always) and run great (when running) However at times the accelerator needs to be depressed all the way to get a start. I have spark ( checked with a spare wire/plug at the distributor) and a good pulse at the pick up coil (5-12vdc) The TPS was recently changed but I dont believe it was needed.
Could tis be as simple as a tune up? Wires/plugs, cap, rotor ect ect ect?
 
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Old May 8, 2014 | 03:22 PM
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Start by checking your IAC, then pull the codes if that checks out.
 
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Old May 8, 2014 | 03:57 PM
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IAC = ( Intake air control )?
 
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Old May 8, 2014 | 03:59 PM
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Originally Posted by bltfrspd64
IAC = ( Intake air control )?
Yes. Start the truck and unplug the IAC, does the motor change at all? If yes, pull the codes.
 
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Old May 8, 2014 | 04:51 PM
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Ok I'll do that. The IAC is the sensor on the throtle body or the one down lower ?
 
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Old May 8, 2014 | 04:53 PM
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I'll get back to it tomorrow morning, I'll let you know.
 
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Old May 8, 2014 | 04:54 PM
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Originally Posted by bltfrspd64
Ok I'll do that. The IAC is the sensor on the throtle body or the one down lower ?
IAC is on the TB, the TPS is the one on the bottom. You said you already replaced the TPS. The TPS can be bad as well and you can check that to make sure. If you turn the key on, don't start motor, then back probe the wires on the TPS. One will be ground, one will be ~5v (this is VREF and should not change) and the last will be the signal back to the computer. This last one should read < 1.0 volt (or so) when the TB is closed. As you open the TB that value should change to where you have > 4 volts at WOT (wide open throttle).
 
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Old May 19, 2014 | 09:54 AM
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Well it was as simple as a loose spark plug boot at the #2 position. New plugs, set the timing and shes as right as rain!!
 
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