Question about 2004 Ford Explorer

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2004 explorer 4.0 sohc tries to die out at 75 mph any ideas on the problem.

Just bought the truck and thats all i have found wrong with it it gets up to about 75 and it starts to lug down

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Hello! I suspect a defective Throttle Positioning Sensor (TPS)...Ther are two inside one encapsulated device...See photo below...If you have a voltmeter they can be tested...The TPS is bolted to the throttle body and has a 4 wire connector...Pin 1=signal out..A Gray/White wire...Pin 2=+5 volts...Yellow/White...Pin 3=Ground...Pink/Orange...Pin 4=signal out...Yellow/White..(maybe a different color)...Using two safety pins push the points into the rear of the in-place connector...Into the Pink/Orange and the Gray/White...Set the meter to read 5 volts...Clip the (+) probe to the Gray/White and the (-) probe to the Pink/Orange...Start the engine...Must read less than 1 volt (.85) at idle...As you increase the throttle to full the meter must read 4.5 volts...
Next move safety pin and (+) probe to Pin 4...Perform the same test...Again meter must read 4.5 volts at full throttle...If either reading is in error the TPS is the culprit...Guru...saailer
AIRTEX / WELLS Part # 5S7264...Cost $70


2004 explorer 4.0 sohc tries to die out at 75 mph  - 2_11_2012_7_30_01_pm.jpg

Posted on Feb 11, 2012

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