I am confused as to what my truck is doing - Ranger-Forums - The Ultimate Ford Ranger Resource

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Old 02-11-2016
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Join Date: Feb 2016
Location: Wellsburg, WV
Posts: 2
I am confused as to what my truck is doing

For some reason my 94 4.0 Ranger sometimes begins to bog for some reason. All of a sudden the check engine light will come on and everytime you hit the gas after it does the truck bogs ansd sometimes shuts off. The funny thing is is that it only does it sometimes. After about a second two, the check engine light goes off and it goes back to idling normally. Any idea what it couldbe?
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Old 02-11-2016
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Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,613
Check the code numbers in memory

Read here: Ford Ranger - Testing EEC-IV Equipped Engines

This will narrow down what to check, it reads like you have a bad connection somewhere, code number will tell you what sensor is going off and on.

Over the years connections can get moisture inside and corrode, simply unplugging them and having a look inside can tell you, and plugging them back in makes cleaner connection if it was just a little dirty.
Check TPS(throttle position sensor) connector
MAF sensor connector, also clean MAF sensor.
Bogging and dirty MAF sensor are common with 4.0l, read here: Ford Ranger Mass Air Flow Cleaning, Removal and Installation

Other thing could be Fuel Pump Relay or fuel pump itself.
Fuel pump relay is controlled by the computer, when engine is running it should stay closed, when closed power is being sent to fuel pump AND computer, computer monitors if power is on or off and will turn on CEL if it goes off when it should be on.
So if fuel pump relay is opening then closing again fuel pump will go off, engine will stumble, and stall if it is off long enough, and CEL would come on.
If fuel pump itself was failing then when it goes off, engine will stumble and misfire turning on CEL.
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